Journal of Seismology最新文献

{"title":"Author Correction: Variation in the level of seismic hazard in Northeast British Columbia, Canada, due to induced seismicity","authors":"Alireza Babaie Mahani, Honn Kao, Karen Assatourians","doi":"10.1007/s10950-026-10412-5","DOIUrl":"10.1007/s10950-026-10412-5","url":null,"abstract":"","PeriodicalId":16994,"journal":{"name":"Journal of Seismology","volume":"30 4","pages":""},"PeriodicalIF":1.3,"publicationDate":"2026-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148380423","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Triggering mechanisms of the 2024 M4.5 earthquake swarm in Mozhugongka, Tibetan Plateau: Constraints from seismotectonics and the role of deep fluids","authors":"Guoqiang Ji,&nbsp;Xingzhong Du,&nbsp;Yong Li,&nbsp;Xuan Ke,&nbsp;Xiaohui Hu,&nbsp;Huabiao Liu,&nbsp;Yu Tang,&nbsp;Kairong Pi","doi":"10.1007/s10950-026-10415-2","DOIUrl":"10.1007/s10950-026-10415-2","url":null,"abstract":"<p>From October to December 2024, the level of seismicity in the Mozhugongka area, Tibetan Plateau, was extremely high. Owing to the complex geological and tectonic environment in the area, the seismogenic structure is not clear. In this study, by collecting earthquake bulletins and three-component seismic event waveforms recorded by the permanent stations of the China Seismic Network, using the double-difference relocation, the focal mechanism solution inversion and the stress field inversion, we obtain the relocation results for 1701 earthquakes and focal mechanism solutions for 19 earthquakes of <i>M</i> ≥ 3.0 to reveal and analyze the characteristics of the seismicity and the corresponding dynamic mechanisms. Our results show that the earthquake swarm is distributed in a strip with a NNE‒SSW strike, with a length of approximately 20 km and a depth of 5–18 km, and it has the characteristics of a shallow normal fault and deep strike-slip fault, suggesting that the earthquakes in the swarm are controlled by a concealed fault. The regional stress field is dominated by normal fault properties of almost north–south compression and almost east–west tension. However, after the <i>M</i>4.5 earthquake, the stress field changed from exhibiting the characteristics of a normal fault controlled by a shallow structure to exhibiting those of a strike-slip fault that is dominated by the deeper faults, reflecting the layered stress release caused by the oblique subduction of the Indian Plate beneath the Tibetan Plateau. The excess fluid pressure within the earthquake swarm exhibits periodic variations, suggesting that deep fluids repeatedly trigger seismic activity, likely linked to locally elevated background heat flow. The Mozhugongka earthquake swarm reflects adjustments of the local seismogenic environment of the Lhasa block in response to the India-Eurasia plate collision. These results provide new insights into the seismogenic mechanism operating on the Tibetan Plateau.</p>","PeriodicalId":16994,"journal":{"name":"Journal of Seismology","volume":"30 4","pages":""},"PeriodicalIF":1.3,"publicationDate":"2026-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148380832","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A comprehensive analysis of spatio-temporal seismicity parameters in the Kope-Dagh Region","authors":"Muhammed Hossein Mousavi,&nbsp;Parastoo Jalooli,&nbsp;Amir Talebi","doi":"10.1007/s10950-026-10414-3","DOIUrl":"10.1007/s10950-026-10414-3","url":null,"abstract":"<div><p>This study investigates the spatio-temporal characteristics of seismicity in the Kopeh-Dagh region between 2006 and 2024 using analyses of magnitude of completeness (Mc), b-value, and correlation dimension (Dc<b>)</b>. The temporal magnitude of completeness varies between approximately 1.5 and 1.9, while the overall completeness magnitude estimated from the frequency–magnitude distribution is Mc = 1.6, indicating that the earthquake catalogue is sufficiently complete above this threshold. The regional b-value is estimated as 0.78 ± 0.01, slightly lower than the global average of about 1.0. Spatially, relatively low b-values (≤ 0.77) are concentrated in the southern and western Kopeh-Dagh, whereas moderate to higher values occur mainly in the central and eastern sectors. The correlation dimension also exhibits pronounced spatial variability, with lower Dc ​values (0.3–0.99) in the southern and western parts of the belt, indicating clustered seismicity, and higher values (1.6–2.3) in the central and northeastern regions, reflecting more diffuse seismicity patterns. Temporal variations in the b-value, ranging from approximately 0.6 to 1.05, suggest changes in seismicity characteristics during the study period. The combined spatial distributions of b value and Dc ​highlight differences in seismicity organization across the Kopeh-Dagh region and provide a statistical description of its seismotectonic behaviour.</p></div>","PeriodicalId":16994,"journal":{"name":"Journal of Seismology","volume":"30 4","pages":""},"PeriodicalIF":1.3,"publicationDate":"2026-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148323981","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Detection of weak teleseismic signals using envelope stacking based on dense arrays","authors":"Xue Fangzheng,&nbsp;Jin Ping,&nbsp;Xu Xiong,&nbsp;Wang Hongchun","doi":"10.1007/s10950-026-10413-4","DOIUrl":"10.1007/s10950-026-10413-4","url":null,"abstract":"<div><p>Enhancing the capability to detect weak teleseismic signals is critical for global underground nuclear test monitoring. As seismic stations are deployed more densely worldwide and multiple large-scale dense array projects are implemented, using these dense, widely distributed stations for teleseismic weak signal detection can effectively complement existing small- and medium-aperture arrays. For large-aperture dense arrays, the envelope method can mitigate the degradation of detection performance caused by signal dissimilarity across stations<b>.</b> This study introduces a processing framework for envelope stacking tailored for large-scale dense arrays. When applied to a large-aperture dense array composed of stations from the USArray Transportable Array (TA) network in the western United States, this method yields a signal-to-noise ratio (SNR) of the stacked envelope waveform exceeding 20 for the first North Korean underground nuclear test, markedly outperforming direct waveform stacking. By configuring dedicated detection beams, interference from events outside the target area can be effectively suppressed. Using waveform simulation, the estimated yield detection threshold for the North Korean test site is approximately 0.8 kilotons of the large-aperture dense array situated in the western United States, with high detection sensitivity maintained within an area of about 5° × 2° surrounding the test site.</p></div>","PeriodicalId":16994,"journal":{"name":"Journal of Seismology","volume":"30 4","pages":""},"PeriodicalIF":1.3,"publicationDate":"2026-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10950-026-10413-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148323388","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Physics based translational ground motion synthetics and quantification of fling and rupture directivity induced ground strains and rotations: a comparative parametric study","authors":"J. P. Narayan,&nbsp; Vishal,&nbsp;Lav Joshi,&nbsp;M. L. Sharma","doi":"10.1007/s10950-026-10405-4","DOIUrl":"10.1007/s10950-026-10405-4","url":null,"abstract":"<div><p>The paper presents viscoelastic finite-difference pseudo-dynamic broadband synthetization of translational near-fault ground motion and quantification of peak-values and variability of fling and rupture directivity induced ground strains and rotations due to change of slip-pattern, nucleation-position and rupture-velocity in the case of Mw6 strike-slip earthquake. Fling and rupture directivity have caused pulse-type motions in the FP- and FN-components over the extent of rupture length and beyond it, respectively. The obtained values of shear strain <span>({varepsilon}_{XY})</span> and torsion is largest among the strains and rotational motions, respectively. The values and variability of ground strains and rotations are largest near the fault-line and a decrease with an increase of off-set. The largest and least variabilities of strains and rotations is obtained in the case of change of slip-pattern and rupture velocity, respectively. The values of shear strain <span>({varepsilon}_{XY})</span> and torsion induced by fling is larger than that induced by rupture directivity.</p></div>","PeriodicalId":16994,"journal":{"name":"Journal of Seismology","volume":"30 4","pages":""},"PeriodicalIF":1.3,"publicationDate":"2026-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148323219","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spectral amplification from impulse response functions retrieved from ambient seismic noise: Adana Basin, Turkey","authors":"Taciser Bakırcı","doi":"10.1007/s10950-026-10407-2","DOIUrl":"10.1007/s10950-026-10407-2","url":null,"abstract":"<div><p>This study investigates the feasibility of extracting physically meaningful seismic amplification from Impulse Response Functions (IRFs) derived from Ambient Seismic Noise (ASN) in the Adana Basin, a deep sedimentary basin in southern Turkey. IRFs are retrieved by cross-correlating long-term noise recordings using a single virtual-source configuration, and the amplitude characteristics of Rayleigh-wave–dominated signals are analysed in the 2–10 s period range, which is particularly sensitive to basin-scale structure. Frequency-domain IRF amplifications exhibit a more consistent and physically meaningful relationship with basin geometry and sediment thickness than time-domain amplifications. Stations overlying the thickest sedimentary sections exhibit systematically higher long-period amplification, in agreement with the known basin geometry. Relative comparisons with observed earthquake amplitudes, basin-specific Ground Motion Prediction Equation (GMPE) estimates, and regional Peak Ground Acceleration (PGA) patterns reveal a consistent spatial correspondence, indicating that IRF-derived spectral amplitudes effectively capture dominant basin-controlled amplification trends. These findings highlight the potential of frequency-domain IRF analysis as a complementary tool for basin investigation and long-period seismic hazard studies, particularly in regions with limited earthquake recordings.</p></div>","PeriodicalId":16994,"journal":{"name":"Journal of Seismology","volume":"30 4","pages":""},"PeriodicalIF":1.3,"publicationDate":"2026-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10950-026-10407-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148261728","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Stochastic ground-motion simulation using the EXtended SIMulation approach and synthetic aperture radar based damage assessment of the 2025 Myanmar earthquake","authors":"Monika,&nbsp;Ashwani Raju,&nbsp;Vikas Singh,&nbsp;Parveen Kumar,&nbsp;S. K. Pal,&nbsp;Saraah Imran,&nbsp; Sandeep","doi":"10.1007/s10950-026-10410-7","DOIUrl":"10.1007/s10950-026-10410-7","url":null,"abstract":"<div><p>The 28 March 2025 strike-slip earthquake (<i>M</i>_<i>w</i>7.7) on the Sagaing Fault, Myanmar, exhibited complex rupture dynamics, including supershear propagation. This study integrates the stochastic ground-motion simulations to validate rupture model and Synthetic Aperture Radar (SAR) derived coherence and backscatter observations to assess the seismic hazard in data-sparse regions. The key source parameters for the simulations, including a seismic moment of 3.36 × 10²⁷ dyne·cm and stress drops of ~ 19–57 bars, are derived from spectral analysis of the same station data. The site response analysis using the horizontal-to-vertical spectra ratio method reveal the peak frequencies between 2.0 and 9.0 Hz across the stations. These independently derived information is then used as the basis for simulating strong ground motions at five regional stations using the Extended SIMulation (EXSIM) finite-fault method. A relatively good match between the observed and simulated records (Root Mean Square error 0.35–0.82), thereby confirm the validity of the rupture parameters and EXSIM technique. The analysis shows that a 450 km curved rupture model, incorporating variable supershear velocities (3.7–4.3 km/s), is necessary to match observations. This approach confirms the role of supershear propagation in extending rupture length beyond empirical scaling. Coseismic coherence and backscatter intensity changes from Sentinel-1 SAR data are used to assess the coseismic damage assessment. Backscatter analysis further shows extensive liquefaction in floodplains and widespread building collapse in urban areas. This study validates an integrated methodology that combines ground-motion simulation for characterizing complex earthquakes and remote sensing approach. The findings provide critical inputs to support seismic hazard mitigation efforts in Myanmar region.</p></div>","PeriodicalId":16994,"journal":{"name":"Journal of Seismology","volume":"30 4","pages":""},"PeriodicalIF":1.3,"publicationDate":"2026-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148261864","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Role of fault geometry in generating backward-migrating P-wave radiation during the 2025 Mw 7.7 Myanmar earthquake","authors":"Kotaro Tarumi,&nbsp;Kazunori Yoshizawa","doi":"10.1007/s10950-026-10408-1","DOIUrl":"10.1007/s10950-026-10408-1","url":null,"abstract":"<div><p>The Mw 7.7 Myanmar earthquake of 28 March 2025 ruptured the Sagaing Fault system over <span>(sim )</span>450 km and exhibited complex rupture behavior, including intermittent supershear propagation and backward-migrating high-frequency (HF) P-wave radiation. We image the rupture evolution using multi-frequency teleseismic P-wave back-projection (BP) (0.05–0.5, 0.1–1.0, and 0.3–2.0 Hz) and compare the results with near-fault strong-motion data recorded at Nay Pyi Taw (NPT). Our BP results reveal two key features: (1) two distinct episodes of backward-migrating HF radiation initiated at the Sagaing–Meiktila and Meiktila–NPT fault junctions, with apparent migration speeds of 6.0–6.5 km/s, and (2) a pronounced HF radiator concentrated on a short splay-fault branch adjacent to the NPT segment. These HF radiators are preferentially located near the edges of high slip-rate patches in a P-wave slip model. The near-field displacement record at NPT shows a negative pulse following the quasi-static offset, likely representing a stopping phase generated by abrupt rupture arrest. Our results suggest that spatial variations in fault geometry, including segment junctions and fault branching, played an important role in rupture deceleration and termination, generating backward-migrating stopping-phase radiation.</p></div>","PeriodicalId":16994,"journal":{"name":"Journal of Seismology","volume":"30 4","pages":""},"PeriodicalIF":1.3,"publicationDate":"2026-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148261861","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 1973 and 2022 Mw 7.6 Michoacan-Colima earthquakes: implications for recurrent interplate rupture in the Mexico Subduction Zone","authors":"C. Mendoza,&nbsp;M. A. Santoyo","doi":"10.1007/s10950-026-10409-0","DOIUrl":"10.1007/s10950-026-10409-0","url":null,"abstract":"<div><p>The Michoacan-Colima, Mexico, Mw 7.6 subduction earthquakes of 30 January 1973 and 19 September 2022 occurred within ~ 20 km of each other and have been suggested to be <i>quasi-repeating</i> events due to the similarity in the globally-recorded seismograms. P waves recorded for the two events, however, are distinctly different, indicating clear dissimilarities in the source characteristics of the two interplate ruptures. We apply a multiple time-window finite-fault inversion method to derive source models for the two earthquakes using the available teleseismic P-waveforms. The time-window formulation used in the inversion provides flexibility in the rise time, yielding a more appropriate estimate of the distribution of fault slip than previously obtained for the 1973 earthquake. Rupture models derived for the two events show significantly different distributions of coseismic slip. Slip during the 1973 earthquake covers a 35-km radius with a peak slip of ~ 2 m downdip of the hypocenter. Slip in 2022 occurs in two separate patches with the highest slip (~ 4 m) located near the hypocenter. The two slip zones of the 2022 earthquake straddle the area of high slip observed in 1973, indicating an adjoining pattern of asperity distribution along the plate boundary where interplate slip in 2022 occurs outside of the 1973 asperity area. This behavior has been observed in other recurring large earthquake sequences along the Mexico subduction zone and is consistent with a noncharacteristic asperity model where future high-slip areas occur in regions adjacent to or away from previous asperities. Finite-fault studies conducted to date for recurring large thrust earthquakes in Mexico, including the 1973/2022 sequence analyzed here, do not show a persistence of interplate asperities for consecutive events. Detailed analyses of the recorded seismic waveforms such as the one presented in this study can provide important constraints on the differences in rupture complexity for recurring events with nearly identical globally-recorded waveforms. </p></div>","PeriodicalId":16994,"journal":{"name":"Journal of Seismology","volume":"30 4","pages":""},"PeriodicalIF":1.3,"publicationDate":"2026-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10950-026-10409-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148261863","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Work to preserve historical seismograms in Central Asia","authors":"Anna Berezina,&nbsp;Inna Sokolova,&nbsp;Irina Gabsatarova,&nbsp;Irina Aristova,&nbsp;Elena Pershina","doi":"10.1007/s10950-026-10406-3","DOIUrl":"10.1007/s10950-026-10406-3","url":null,"abstract":"<div><p>This article highlights several types of activity to preserve historical analog seismograms in the former Soviet Union. This work includes the restoration, preservation, scanning, and digitization of historical seismograms of various events within the USSR. Specific examples are used to illustrate one of the challenges of regional seismic monitoring that can be addressed using historical analog seismograms, which were digitized. This involves refining the parameters of historical earthquakes in low-seismicity areas. For such events the kinematic and dynamic parameters (magnitude and energy class) were determined, as well as their focal mechanisms. The historically destructive Kamenskoye earthquake of February 15, 1965, near the Kamen-na-Obi city was examined. It is assumed that short-term seismic activity in the Kamen-na-Obi area was most likely induced by the construction of a large reservoir near the city and supernormal volume of water from atmospheric precipitation formed in this area on period 1964–1965. </p></div>","PeriodicalId":16994,"journal":{"name":"Journal of Seismology","volume":"30 3","pages":""},"PeriodicalIF":2.0,"publicationDate":"2026-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148236905","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}