Journal of Geodynamics最新文献

{"title":"Coeval Miocene development of thrust belt-backarc and forearc extension during the subduction of a continental margin (Western-Central Mediterranean Sea)","authors":"Alfonsa Milia ,&nbsp;Maurizio M. Torrente","doi":"10.1016/j.jog.2021.101882","DOIUrl":"10.1016/j.jog.2021.101882","url":null,"abstract":"<div><p>The position of the middle-upper Miocene volcanic arc, encompassing the Maghrebides, the Sardinia Channel and the Sardinia-Corsica block, implies that the Algerian and Tyrrhenian basins developed, respectively, as backarc and forearc extensional zones in the Western-Central Mediterranean. The opening of the Western-Central Mediterranean Neogene extensional basin has been commonly interpreted as a two-step process: the opening of the Provençal-Algerian basin during the early-middle Miocene, followed, in the late Miocene, by the formation of the Tyrrhenian Basin. This article is an attempt to synthesize knowledge about the hinge zone between Algerian and Tyrrhenian basins by combining the analysis of seismic reflection profiles with dredge and borehole data in order to investigate how the transition between the eastern Algerian backarc and Tyrrhenian forearc geodynamic settings took place. We identified three sectors: the western Tyrrhenian characterized by a Tortonian forearc extension; the Sardinia Channel, which preserves the architecture of the lower Miocene Maghrebian thrust belt formed during the collision between Europe and Africa plates; and the easternmost Algerian basin-Sicily Channel where a backarc–thrust belt system developed during the Tortonian stage. During the extensional events, we hypothesize the re-activation of inherited structures during Tortonian rifting, (that is a negative tectonic inversion of pre-existing Eocene and early Miocene thrust faults). The contemporaneity of two different geodynamic environments, the forearc extension in the northern area and backarc–thrust belt system in the southern area, can be directly related with a lateral variation of the lower plate paleogeography of the Africa continental margin. This evidence contributes to the understanding of how the paleogeography of the lower plate can control, to a certain extent, the tectonic evolution of the upper plate in a subduction setting.</p></div>","PeriodicalId":54823,"journal":{"name":"Journal of Geodynamics","volume":"149 ","pages":"Article 101882"},"PeriodicalIF":2.3,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47490843","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Eruption cycles of Mount Etna triggered by seasonal climatic rainfall","authors":"Sambit Sahoo,&nbsp;Deepak K. Tiwari,&nbsp;Dibyashakti Panda,&nbsp;Bhaskar Kundu","doi":"10.1016/j.jog.2021.101896","DOIUrl":"10.1016/j.jog.2021.101896","url":null,"abstract":"<div><p>The ability to mitigate and predict volcanic risk is a long-standing question in the Geosciences’ community, while the extent of volcanic activity may be regulated by a predictable and periodic external excitation induced by seasonal rainfall, hydrological loading, or Moon-Sun gravitational force. Moreover, the complex stress-triggering, hydro-mechanical coupling in response to seasonal rainfall, and associated feedback mechanism with deep magmatic process remains enigmatic and indeed deserves more attention in view of recent climate change scenario. In this letter, a compelling scenario of seasonal rainfall-triggered eruption cycles of Mount Etna (Italy) is found and presented on the eastern coast of Sicily which continuously erupting since last 200 kyr. Results show that the seasonal rainfall significantly weakened the Mount Etna edifice and initiated mechanical tensile failure in the complex magmatic plumbing system and adjacent flank surface by changing the pore pressure build-up, probably promoting dyke intrusion and eventual triggering of eruptive cycle. Further, the possibility of seasonal hydrological loading on the Mount Etna volcano and adjacent flank region, hydrological load-induced sliding along the impermeable outer ‘shell’ of the flank are discussed, and the effect of tidal stress perturbations on the eruptions cycle cannot be ruled out completely.</p></div>","PeriodicalId":54823,"journal":{"name":"Journal of Geodynamics","volume":"149 ","pages":"Article 101896"},"PeriodicalIF":2.3,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45384604","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Kinematic reconstruction of the Raohe accretionary complex, Northeast China: Integration of onshore geologic evidence and global plate model","authors":"Zaizheng Zhou ,&nbsp;Zuozhen Han ,&nbsp;Sanzhong Li ,&nbsp;Zhaoxia Jiang ,&nbsp;Xiyao Li ,&nbsp;Haoyuan Lan","doi":"10.1016/j.jog.2021.101895","DOIUrl":"10.1016/j.jog.2021.101895","url":null,"abstract":"<div><p><span><span>The Raohe accretionary complex (RHC) is located at the eastern of northeast China and adjacent to Russian Far East. As a part of the Circum-Pacific Orogenic Belt, it is the unique region of the accretionary orogenic belt, which is associated with the subduction process of the Panthalassic-Pacific Plate (PPP). We synthesize the detrital </span>zircon ages of terrigenous </span>clastic rocks<span><span><span> of the RHC and tectonic units along the East Asian Continental Margin (EACM) to clarify its provenance. Then we place the docking position of the RHC adjacent to the South China Block, and determine that the final accretion of the RHC occur during the later </span>Late Jurassic (~150 Ma) according to combination for ages of stitching plutons and terrigenous clastic rock. Integrating with the published global-scale plate kinematic frame, we restored the pre-docking motion path of the RHC using the Gplates software. The reconstructed scenario shows that it is a long distance of at least 1000 km between the proto-RHC and continent margin when the basaltic </span>volcanism occurred subaqueously within the abyssal basin of the PPP. This model also provides a probability that the proto-RHC and the proto-Yuejingshan accretionary complexes have the same drift history, before their simultaneous emplacement into the continental margin.</span></p></div>","PeriodicalId":54823,"journal":{"name":"Journal of Geodynamics","volume":"149 ","pages":"Article 101895"},"PeriodicalIF":2.3,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42964298","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fractal dimension and area of seismicity in the Baikal Rift System: Implications for modern geodynamics","authors":"A.V. Klyuchevskii ,&nbsp;V.M. Dem'yanovich ,&nbsp;F.L. Zuev ,&nbsp;A.A. Klyuchevskaya ,&nbsp;A.A. Kakourova ,&nbsp;A.A. Golovko","doi":"10.1016/j.jog.2021.101894","DOIUrl":"10.1016/j.jog.2021.101894","url":null,"abstract":"&lt;div&gt;&lt;p&gt;&lt;span&gt;The fractal geometry and extent of seismicity in the Baikal Rift System (BRS) are estimated from data on 52,700 instrumental events of &lt;/span&gt;&lt;em&gt;M&lt;/em&gt;&lt;sub&gt;LH&lt;/sub&gt; ≥ 2.5 magnitudes for fifty years (1964–2013). The seismic pattern is characterized by the box-counting Hausdorff dimension &lt;em&gt;D&lt;/em&gt;&lt;sub&gt;0&lt;/sub&gt;, multifractal spectra &lt;em&gt;f&lt;/em&gt;(&lt;em&gt;α&lt;/em&gt;), and surface area &lt;em&gt;S&lt;/em&gt; of seismicity at three scales: the rift system as a whole, its three zones, and six subzones. The multifractal spectra record a self-similar hierarchical structure of the BRS seismicity pattern. The space and time variations in the fractal dimension (&lt;em&gt;D&lt;/em&gt;&lt;sub&gt;0&lt;/sub&gt;) and area of seismicity (&lt;em&gt;S&lt;/em&gt;&lt;span&gt;), which are mapped and plotted as a function of time, show good correlation. The two parameters depend on three related factors: progressive increase in the amount of instrumental data (dataset size), structure of seismogenic fault network, and geodynamic activity. They increase as ever more data appear with time and acquire high local values at increasing extent and density of quakes. Moreover, the obtained &lt;/span&gt;&lt;em&gt;D&lt;/em&gt;&lt;sub&gt;0&lt;/sub&gt; estimates reflect statistical self-similarity of earthquake patterns being in the range ≈ 1.45–1.55 over most of BRS, except one zone and one subzone in the rift flanks. They are the highest in the southwest and the lowest in the northeast of the rift system (&lt;em&gt;D&lt;/em&gt;&lt;sub&gt;0&lt;/sub&gt; ≈ 1.60 ± 0.02 and &lt;em&gt;D&lt;/em&gt;&lt;sub&gt;0&lt;/sub&gt; ≈ 1.37 ± 0.02 respectively). This dissimilarity indicates that seismogenic faulting occurs by different mechanisms: distributed failure as a result of superposed global-scale collisional compression and regional rifting in the SW flank and quasi-linear rift propagation in the NE flank. In general, &lt;em&gt;D&lt;/em&gt;&lt;sub&gt;0&lt;/sub&gt; decreases toward the northeastern part of the BRS, where the pattern of earthquakes becomes localized along lineaments instead of being distributed over an area. The space and time variations of &lt;em&gt;D&lt;/em&gt;&lt;sub&gt;0&lt;/sub&gt; and &lt;em&gt;S&lt;/em&gt;&lt;span&gt; revealed in the earthquake data are consistent with the location and activity pulses of rifting attractors and provide a realistic explanation of BRS geodynamics and tectonophysics. The global lithospheric compression and the regional pulse-like activity of rifting attractors control the network of seismogenic faults which, in turn, govern the fractal geometry and 2D structure of seismicity in the region. The obtained results confirm the oscillatory dynamics of the regional seismicity at a decadal period correlated with activity pulses of rifting attractors. The oscillations stand out against the background of decreasing global low-frequency secular cycle of the BRS seismicity. The BRS lithospheric geodynamics fits the model of a nonlinear oscillator with dissipation. The suggested analysis of the fractal geometry and extent of seismicity as proxies of the faulting evolution provides insights into modern geodynamics of the Baikal Rift System a","PeriodicalId":54823,"journal":{"name":"Journal of Geodynamics","volume":"149 ","pages":"Article 101894"},"PeriodicalIF":2.3,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41678175","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Reply to the comment on “Devonian to Permian post-orogenic denudation of the Brasília Belt of West Gondwana: insights from apatite fission track thermochronology” by Alessandretti and Warren, 2021","authors":"Ana Carolina Liberal Fonseca ,&nbsp;Gabriella Vago Piffer ,&nbsp;Simon Nachtergaele ,&nbsp;Gerben Van Ranst ,&nbsp;Johan De Grave ,&nbsp;Tiago Amâncio Novo","doi":"10.1016/j.jog.2021.101893","DOIUrl":"10.1016/j.jog.2021.101893","url":null,"abstract":"<div><p><span>Here we reply to the comment by Alessandretti and Warren, (2021) on the paper “Devonian to Permian post-orogenic </span>denudation<span><span> of the Brasília Belt of West Gondwana: insights from </span>apatite<span> fission track thermochronology” by Fonseca et al. (2020). We have the impression that many of the remarks, at least to some extent stem from a misunderstanding of our manuscript, also considering that they did not propose any alternative hypothesis for interpretation of our results presented in the aforementioned paper. We, thus, reiterate our interpretations from our low-temperature thermochronology<span> data. The basement of the Brasilia Belt was subject to a significant exhumation during the Devonian to the Permian through erosion, and was likely a source area for detrital sediments deposited in parts of the northeastern Paraná Basin at that time. Apatite fission-track data show that Meso-Cenozoic events had limited effect on post-orogenic exhumation of the Brasília Belt, in contrast to e.g. the Araçuaí Belt.</span></span></span></p></div>","PeriodicalId":54823,"journal":{"name":"Journal of Geodynamics","volume":"149 ","pages":"Article 101893"},"PeriodicalIF":2.3,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48850665","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Arc tempos of the Gangdese batholith, southern Tibet","authors":"Xuxuan Ma ,&nbsp;Snir Attia ,&nbsp;Tarryn Cawood ,&nbsp;Wenrong Cao ,&nbsp;Zhiqin Xu ,&nbsp;Haibing Li","doi":"10.1016/j.jog.2022.101897","DOIUrl":"10.1016/j.jog.2022.101897","url":null,"abstract":"<div><p><span><span>The character of arcs varies over time with significant temporal fluctuations in the quantity and spatiotemporal patterns of magmatism<span>. However, the driving mechanisms for this episodic behavior of arcs need more constraints. This paper analyzed the published data along with our new zircon<span> U-Pb dating and Hf isotopic and whole-rock geochemical data of plutonic rocks in the Gangdese belt in southern </span></span></span>Tibet<span><span><span><span> to explore the features, potential drivers, and tectonic implications of episodic arc activity in the Gangdese arc. A comprehensive compilation of U-Pb ages and Lu-Hf isotopic analyses of zircon grains from igneous rocks in the Gangdese belt, sedimentary rocks in trench fill sequences, </span>forearc basins and </span>foreland basins<span>, and sands from modern river reveals that: 1) Gangdese arc activity was episodic during Late Cretaceous<span> to Middle Eocene, displaying two magmatic flare-ups (ca. 100–80 and 65–45 Ma) and one magmatic lull (ca. 80–65 Ma), and 2) both flare-up </span></span></span>magmas show relatively positive ε</span></span>_Hf<span><span>(t) values (+5 ~ +15) indicative of juvenile sources suggesting these magmas are dominated by contributions from the depleted mantle. In contrast, the magmatic lull between these two magmatic flare-ups could be caused by flat subduction of the Neotethyan slab beneath the southern margin of the Lhasa terrane. These flare-ups likely contributed greatly to the </span>crustal thickening<span> of the Gangdese belt. Constraints from paleo-elevation and geochemical proxies for crustal thickness showed that the ~100–80 Ma flare-up was accompanied by the formation of a thick arc root while the ~65–45 Ma flare-up likely developed in a thinner crust without an arc root.</span></span></p></div>","PeriodicalId":54823,"journal":{"name":"Journal of Geodynamics","volume":"149 ","pages":"Article 101897"},"PeriodicalIF":2.3,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47606199","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Geodynamic events leading to formation of passive western continental margin of India","authors":"T. Radhakrishna ,&nbsp;B.K. Bansal ,&nbsp;Ch. Ramakrishna","doi":"10.1016/j.jog.2021.101878","DOIUrl":"10.1016/j.jog.2021.101878","url":null,"abstract":"<div><p><span>The geodynamic<span> events of continental breakup<span> and origin of northwest Indian Ocean led to the development of passive continental margin, off western India. However, causal mechanisms and relative chronology of these geodynamic events are not clearly known because of complex regional-scale ridges-basin physiography, multi-stage rifting in a short-time span and thick sediment cover. The Laxmi and adjacent Gop basins constitute key tectonic elements and geophysical investigations on them have come up with sharply divergent explanations of continental rifting and ocean spreading. We present geochemical results of the Laxmi Basin (LB) basement, recovered by the International Ocean Discovery Program Expedition-355 and interpreted in light of existing geophysical results. The basement is identified as continental rift </span></span></span>basalt, different from the Deccan/Madagascan basalts. We suggest the basement eruption at ~75 Ma causing igneous underplating which triggered the extension/rifting in Laxmi and Gop basins. The rifting translated into ocean spreading only in the Gop Basin and not in the Laxmi Basin. The geodynamic events echoed soon with similar relative chronology in western India with Reunion plume impact and the Deccan eruption followed by second extension/rifting that culminated in India-Seychelles breakup.</p></div>","PeriodicalId":54823,"journal":{"name":"Journal of Geodynamics","volume":"148 ","pages":"Article 101878"},"PeriodicalIF":2.3,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46046680","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The tectono-stratigraphic and magmatic evolution of conjugate rifted margins: Insights from the NW South China Sea","authors":"Peng Chao ,&nbsp;Gianreto Manatschal ,&nbsp;Pauline Chenin ,&nbsp;Jianye Ren ,&nbsp;Cuimei Zhang ,&nbsp;Xiong Pang ,&nbsp;Jinyun Zheng ,&nbsp;Linlong Yang ,&nbsp;Nick Kusznir","doi":"10.1016/j.jog.2021.101877","DOIUrl":"10.1016/j.jog.2021.101877","url":null,"abstract":"<div><p>This study is based on a careful analysis of high-quality reflection seismic sections located at the tip of the NW South China Sea V-shaped rift basin. Using the CGN-1 section, a seismic line imaging the complete sedimentary and magmatic architecture of conjugate rifted margins, we: (1) provide a detailed description of the crustal architecture; (2) define extensional domains, which we relate to specific deformation phases; and (3) determine the tectono-stratigraphic evolution linked to rifting. Based on these, we propose a kinematic restoration and quantify the amounts of extension and associated strain rates. We discuss the link between the kinematic evolution and the sedimentary and magmatic record and illustrate it in a Wheeler Diagram. Relying on the identification and characterization of distinct stratal patterns and crustal architectures, we propose qualitative and quantitative criteria to interpret two critical rift events that are necking and hyperextension. These two events are linked to the individualization and subsequent dismembering of a so-called keystone, here referred to as H-block. It is the first time such an approach is used to decipher the tectono-stratigraphic evolution of a complete syn-rift mega-sequence across present-day conjugate rifted margins. This study differs from previous interpretations of correlative surfaces in the distinction between: (1) different types of top basement; and (2) syn- and post-tectonic packages within the syn-rift record. It leads to new interpretations of the tectono-stratigraphic evolution of the NW South China Sea and has the potential to be used as a new approach to analyze, quantify and correlate events recorded in seismic sections across rifted margins.</p></div>","PeriodicalId":54823,"journal":{"name":"Journal of Geodynamics","volume":"148 ","pages":"Article 101877"},"PeriodicalIF":2.3,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42711791","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ca. 835–823 Ma doming extensional tectonics in the west Jiangnan accretionary orogenic belt, South China: Implication for a slab roll-back event","authors":"Jinlong Yao ,&nbsp;Liangshu Shu ,&nbsp;Guochun Zhao ,&nbsp;Yigui Han ,&nbsp;Qian Liu","doi":"10.1016/j.jog.2021.101879","DOIUrl":"10.1016/j.jog.2021.101879","url":null,"abstract":"<div><p><span>The Neoproterozoic Jiangnan accretionary orogenic belt recorded the accretion and collision of the Yangtze and Cathaysia blocks to form a stablized South China Block, but related geometry and kinematics is poorly constrained, leading to largely varied tectonic models. Here, we present detailed field investigation and kinematic analysis of the plutonic-metamorphic complexes in the Yuanbaoshan and Sanfang areas of the west Jiangnan orogenic belt, which enables identification of extensional granite-cored domes. In the dome margins, down-dipping </span>lineations<span><span> display a radial pattern and dome dominated foliations are extensively developed. The shearing structures within the plutonic-metamorphic complexes display extensional shearing surrounding the Yuanbaoshan and Sanfang granitic dome cores. Gneissic granites and massive ones from both the Yuanbaoshan and Sanfang plutons yield comparable crystallization ages of ca. 835–823 Ma that are within age errors of each other, as are the sheared recrystallized asymmetric quartz veins and mylonites dated at 831 Ma. Overall ages of the deformed Sibao Group and the undeformed overlying Danzhou Group, along with those of the granite plutons and mylonites, suggest formation of the granite-cored domes at ca. 835–823 Ma, coeval to the timing of emplacement of the granitic plutons. Locally, top-to-the-E thrusting structures are also observed in the west Yuanbaoshan and Sanfang areas and are inferred as at ca. 860–835 Ma, coinciding well with E- or SE- directed structures developed elsewhere in the Jiangnan orogenic belt, but in contrast with doming extensional shearing structures. Therefore, overall geometry and kinematics in the west Jiangnan belt indicate development of granitic dome related extensional ductile shearing deformation dated at ca. 835–823 Ma and a possible top-to-the-E compressional ductile thrusting deformation within 860–835 Ma. Given the previously inferred </span>regional geology<span><span> observations, along with age and chemical data across the Jiangnan orogenic belt, the dominant extensional shearing deformation in the region argue for a slab roll-back event within an accretionary belt, typical of domes-and-basins structures formed in accretionary convergent continental margin. The top-to-the-E thrusting is here interpreted as corresponding to compressional regime generated by the west directed subduction of </span>oceanic crust beneath the northern Guangxi continental margin arc in the west Jiangnan orogenic belt.</span></span></p></div>","PeriodicalId":54823,"journal":{"name":"Journal of Geodynamics","volume":"148 ","pages":"Article 101879"},"PeriodicalIF":2.3,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42341284","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Lithosphere ionosphere coupling associated with three earthquakes in Pakistan from GPS and GIM TEC","authors":"M. Arslan Tariq ,&nbsp;Munawar Shah ,&nbsp;Zishen Li ,&nbsp;Ningbo Wang ,&nbsp;M. Ali Shah ,&nbsp;Talat Iqbal ,&nbsp;Libo Liu","doi":"10.1016/j.jog.2021.101860","DOIUrl":"10.1016/j.jog.2021.101860","url":null,"abstract":"<div><p><span><span>Total Electron Content (TEC) derived from satellite-based measurements has been widely used for the detection of </span>ionospheric<span><span> perturbations associated with earthquakes. In this paper, we analyze Pre-Earthquake Ionospheric Anomalies (PEIAs) with TEC data from Global Positioning System (GPS) stations in two Pakistani regions, Islamabad (33.74°N, 73.16°E) and Multan (30.26°N, 71.50°E). These stations operate within seismogenic zones of three earthquakes in Pakistan and Tajikistan. We implement a statistical technique on daily TEC for the detection of PEIA. The results show that PEIAs appear in the form of enhancement during 08:00–12:00 UT (LT = UT+5 h) within 5–10 days before the mainshock. Global Ionospheric Maps (GIMs) over the </span>epicentre are examined on abnormal TEC days. Dense electron enhancements occur during 08:00−12:00 UT, i.e. before three M</span></span><em>_w</em>&gt; 5.0 earthquakes. Diurnal mean TEC deviates on the suspected days. It supports the anomalous signatures observed in the temporal and spatial distributions during the particular days. The geomagnetic and solar indices show no activity. These results endorse the existence of Lithosphere Atmosphere Ionospheric Coupling (LAIC) mechanism within the earthquake preparation period associated with the Pakistan and Tajikistan earthquakes.</p></div>","PeriodicalId":54823,"journal":{"name":"Journal of Geodynamics","volume":"147 ","pages":"Article 101860"},"PeriodicalIF":2.3,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.jog.2021.101860","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41293327","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}