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Earthquake Potential in the Zagros Region, Iran 伊朗扎格罗斯地区的地震潜力
IF 2.3 4区 地球科学
Acta Geophysica Pub Date : 2016-12-02 DOI: 10.1515/acgeo-2016-0080
R. Madahizadeh, M. Mostafazadeh, Shobyr Ashkpour-Motlagh
{"title":"Earthquake Potential in the Zagros Region, Iran","authors":"R. Madahizadeh, M. Mostafazadeh, Shobyr Ashkpour-Motlagh","doi":"10.1515/acgeo-2016-0080","DOIUrl":"https://doi.org/10.1515/acgeo-2016-0080","url":null,"abstract":"Seismic strain and b value are used to quantify seismic potential in the Zagros region (Iran). Small b values (0.69 and 0.69) are related to large seismic moment rates (9.96×1017 and 4.12×1017) in southern zones of the Zagros, indicating more frequent large earthquakes. Medium to large b values (0.72 and 0.92) are related to small seismic moment rates (2.94×1016 and 6.80×1016) in middle zones of the Zagros, indicating less frequent large earthquakes. Small b value (0.64) is related to medium seismic moment rate (1.38×1017) in middle to northern zone of the Zagros, indicating frequent large earthquakes. Large b value (0.87) is related to large seismic moment rate (2.29×1017) in northwestern zone, indicating more frequent large earthquakes. Recurrence intervals of large earthquakes (M > 6) are short in southern (10 and 14 years) and northwestern (13 years) zones, while the recurrence intervals are long in the middle (46 and 114 years) and middle to northern (25 years) zones.","PeriodicalId":50898,"journal":{"name":"Acta Geophysica","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2016-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/acgeo-2016-0080","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67091280","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}
引用次数: 3
Practical Implementation of Prestack Kirchhoff Time Migration on a General Purpose Graphics Processing Unit 通用图形处理单元上栈前Kirchhoff时间偏移的实际实现
IF 2.3 4区 地球科学
Acta Geophysica Pub Date : 2016-12-02 DOI: 10.1515/acgeo-2016-0033
Guofeng Liu, C. Li
{"title":"Practical Implementation of Prestack Kirchhoff Time Migration on a General Purpose Graphics Processing Unit","authors":"Guofeng Liu, C. Li","doi":"10.1515/acgeo-2016-0033","DOIUrl":"https://doi.org/10.1515/acgeo-2016-0033","url":null,"abstract":"In this study, we present a practical implementation of prestack Kirchhoff time migration (PSTM) on a general purpose graphic processing unit. First, we consider the three main optimizations of the PSTM GPU code, i.e., designing a configuration based on a reasonable execution, using the texture memory for velocity interpolation, and the application of an intrinsic function in device code. This approach can achieve a speedup of nearly 45 times on a NVIDIA GTX 680 GPU compared with CPU code when a larger imaging space is used, where the PSTM output is a common reflection point that is gathered as I[nx][ny][nh][nt] in matrix format. However, this method requires more memory space so the limited imaging space cannot fully exploit the GPU sources. To overcome this problem, we designed a PSTM scheme with multi-GPUs for imaging different seismic data on different GPUs using an offset value. This process can achieve the peak speedup of GPU PSTM code and it greatly increases the efficiency of the calculations, but without changing the imaging result.","PeriodicalId":50898,"journal":{"name":"Acta Geophysica","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2016-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/acgeo-2016-0033","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67088261","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}
引用次数: 3
Scaling Analysis of Time Distribution between Successive Earthquakes in Aftershock Sequences 余震序列中连续地震时间分布的标度分析
IF 2.3 4区 地球科学
Acta Geophysica Pub Date : 2016-12-02 DOI: 10.1515/acgeo-2016-0037
Elisaveta Marekova
{"title":"Scaling Analysis of Time Distribution between Successive Earthquakes in Aftershock Sequences","authors":"Elisaveta Marekova","doi":"10.1515/acgeo-2016-0037","DOIUrl":"https://doi.org/10.1515/acgeo-2016-0037","url":null,"abstract":"The earthquake inter-event time distribution is studied, using catalogs for different recent aftershock sequences. For aftershock sequences following the Modified Omori’s Formula (MOF) it seems clear that the inter-event distribution is a power law. The parameters of this law are defined and they prove to be higher than the calculated value (2–1/p). Based on the analysis of the catalogs, it is determined that the probability densities of the inter-event time distribution collapse into a single master curve when the data is rescaled with instantaneous intensity, R(t; Mth), defined by MOF. The curve is approximated by a gamma distribution. The collapse of the data provides a clear view of aftershock-occurrence self-similarity.","PeriodicalId":50898,"journal":{"name":"Acta Geophysica","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2016-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/acgeo-2016-0037","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67088531","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}
引用次数: 0
Site-specific Probabilistic Seismic Hazard Map of Himachal Pradesh, India. Part II. Hazard Estimation 印度喜马偕尔邦特定地点概率地震危险图。第二部分。风险评估
IF 2.3 4区 地球科学
Acta Geophysica Pub Date : 2016-12-02 DOI: 10.1515/acgeo-2016-0011
Prabhu Muthuganeisan, S. Raghukanth
{"title":"Site-specific Probabilistic Seismic Hazard Map of Himachal Pradesh, India. Part II. Hazard Estimation","authors":"Prabhu Muthuganeisan, S. Raghukanth","doi":"10.1515/acgeo-2016-0011","DOIUrl":"https://doi.org/10.1515/acgeo-2016-0011","url":null,"abstract":"This article presents site-specific probable seismic hazard of the Himachal Pradesh province, situated in a seismically active region of northwest Himalaya, using the ground motion relations presented in a companion article. Seismic recurrence parameters for all the documented probable sources are established from an updated earthquake catalogue. The contour maps of probable spectral acceleration at 0, 0.2, and 1 s (5% damping) are presented for 475 and 2475 years return periods. Also, the hazard curves and uniform hazard response spectrums are presented for all the important cities in this province. Results indicate that the present codal provision underestimates the seismic hazard at cities of Bilaspur, Shimla, Hamirpur, Chamba, Mandi, and Solan. In addition, regions near Bilaspur and Chamba exhibit higher hazard levels than what is reported in literature.","PeriodicalId":50898,"journal":{"name":"Acta Geophysica","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2016-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/acgeo-2016-0011","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67087660","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}
引用次数: 19
M9 Tohoku Earthquake Hydro- and Seismic Response in the Caucasus and North Turkey 东北9级地震-高加索和土耳其北部的水文和地震反应
IF 2.3 4区 地球科学
Acta Geophysica Pub Date : 2016-12-02 DOI: 10.1515/acgeo-2016-0022
T. Chelidze, I. Shengelia, N. Zhukova, T. Matcharashvili, G. Melikadze, Genady Kobzev
{"title":"M9 Tohoku Earthquake Hydro- and Seismic Response in the Caucasus and North Turkey","authors":"T. Chelidze, I. Shengelia, N. Zhukova, T. Matcharashvili, G. Melikadze, Genady Kobzev","doi":"10.1515/acgeo-2016-0022","DOIUrl":"https://doi.org/10.1515/acgeo-2016-0022","url":null,"abstract":"Presently, there are a lot of observations on the significant impact of strong remote earthquakes on underground water and local seismicity. Teleseismic wave trains of strong earthquakes give rise to several hydraulic effects in boreholes, namely permanent water level changes and water level oscillations, which closely mimic the seismograms (hydro-seismograms). Clear identical anomalies in the deep borehole water levels have been observed on a large part of the territory of Georgia during passing of the S and Love–Rayleigh teleseismic waves (including also multiple surface Rayleigh waves) of the 2011 Tohoku M9 earthquake. The analysis carried out in order to find dynamically triggered events (non-volcanic tremors) of the Tohoku earthquake by the accepted methodology has not revealed a clear tremor signature in the test area: the Caucasus and North Turkey. The possible mechanisms of some seismic signals of unknown origin observed during passage of teleseismic waves of Tohoku earthquake are discussed.","PeriodicalId":50898,"journal":{"name":"Acta Geophysica","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2016-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/acgeo-2016-0022","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67087979","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}
引用次数: 4
Erroneous GNSS Strain Rate Patterns and their Application to Investigate the Tectonic Credibility of GNSS Velocities 错误的GNSS应变速率模式及其在GNSS速度构造可信度研究中的应用
IF 2.3 4区 地球科学
Acta Geophysica Pub Date : 2016-12-02 DOI: 10.1515/acgeo-2016-0057
A. Araszkiewicz, M. Figurski, M. Jarosiński
{"title":"Erroneous GNSS Strain Rate Patterns and their Application to Investigate the Tectonic Credibility of GNSS Velocities","authors":"A. Araszkiewicz, M. Figurski, M. Jarosiński","doi":"10.1515/acgeo-2016-0057","DOIUrl":"https://doi.org/10.1515/acgeo-2016-0057","url":null,"abstract":"The paper concerns investigation of the credibility of tectonic interpretation of GNSS strain rates. The analysis was focused on stable regions, where the crustal deformations are small and the reliability of GNSS velocities is questionable. We are showing how the unreliable motion of stations affects calculated strains around them. We expressed distribution of local principal strains by a sinusoidal function and used them to investigate the significance of strain distortion. Then we used this method to investigate real motions of GNSS stations. As a test object we used Polish GNSS stations belonging to the ASG-EUPOS network. Station velocities were estimated on the basis of the 4.5 years of observations. The results let us identify stations that disturb the obtained local GNSS strain rate field. After verification and exclusion of some stations, the new GNSS strains show a much greater internal compatibility and also better fit to the directions of lithosphere stresses.","PeriodicalId":50898,"journal":{"name":"Acta Geophysica","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2016-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/acgeo-2016-0057","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67090012","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}
引用次数: 17
A 15-Year Analysis of Surface Ozone Pollution in the Context of Hot Spells Episodes over Poland 在波兰高温事件背景下的15年地表臭氧污染分析
IF 2.3 4区 地球科学
Acta Geophysica Pub Date : 2016-12-02 DOI: 10.1515/acgeo-2016-0067
J. Struzewska, M. Jefimow
{"title":"A 15-Year Analysis of Surface Ozone Pollution in the Context of Hot Spells Episodes over Poland","authors":"J. Struzewska, M. Jefimow","doi":"10.1515/acgeo-2016-0067","DOIUrl":"https://doi.org/10.1515/acgeo-2016-0067","url":null,"abstract":"Analysis of summertime temperature characteristics and ozone exposure indexes were carried out for eight locations in Poland for a 15-year period (1997–2011). The number of days with the maximum temperature exceeding 25°C and 30°C was calculated for each year. The analysis covered the 8-hour running average and daily maximum of near surface ozone concentrations. Also, the accumulated exposure when ozone concentrations were above 120 μg/m3 (AOT60) was calculated as a diagnostic indicator of adverse health effects for each year. Although high ozone concentrations are associated with hot temperatures, the exposure to values higher than 120 μg /m3 is correlated with the length of the hot weather period rather than with the occurrence of days with extremely high temperatures. In most cases the elevated ozone concentrations occurred during days when the maximum temperature was higher than 24°C. Episodes of very high ozone concentrations, exceeding 180 μg /m3, were not associated with heat wave periods at analysed locations.","PeriodicalId":50898,"journal":{"name":"Acta Geophysica","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2016-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/acgeo-2016-0067","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67090823","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}
引用次数: 6
Three Dimensional Crustal Density Structure of Central Asia and its Geological Implications 中亚三维地壳密度结构及其地质意义
IF 2.3 4区 地球科学
Acta Geophysica Pub Date : 2016-12-02 DOI: 10.1515/acgeo-2015-0056
Wencai Yang, Zhaoxi Chen, Z. Hou, Changqing Yu
{"title":"Three Dimensional Crustal Density Structure of Central Asia and its Geological Implications","authors":"Wencai Yang, Zhaoxi Chen, Z. Hou, Changqing Yu","doi":"10.1515/acgeo-2015-0056","DOIUrl":"https://doi.org/10.1515/acgeo-2015-0056","url":null,"abstract":"This paper introduces the scale-depth law of multi-scale wavelet analysis for regional gravity data processing, and presents the results of its application to Central Asia for computation of the 3D crustal density structures. The wavelet analysis method is applied for characterizing 3D crustal density structure, producing five maps of density disturbance corresponding to different depths of equivalent layers in the crust. The results provide important evidence for the study of crustal structures and mass movement in Central Asia: (i) the small-scale and intensive linear density disturbances in the upper crust indicate Phanerozoic orogenic belts; (ii) there exists a horseshoe-shaped low-density belt in the middle crust coinciding with the Kazakhstan orocline; (iii) there is a very low density zone in the lower crust, extending from western Kunlun to Tianshan, probably indicating a lower-crust flow; (iv) there are a few lowdensity spots in the middle crust, which might be caused by low-density mass squeezing upward from the lower crust flows.","PeriodicalId":50898,"journal":{"name":"Acta Geophysica","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2016-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/acgeo-2015-0056","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67086929","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}
引用次数: 1
Using Vertical Electrical Soundings for Characterizing Hydrogeological and Tectonic Settings in Deir El-Adas Area, Yarmouk Basin, Syria 利用垂直电测深表征叙利亚耶尔穆克盆地Deir El-Adas地区水文地质和构造环境
IF 2.3 4区 地球科学
Acta Geophysica Pub Date : 2016-12-02 DOI: 10.1515/acgeo-2016-0025
W. Al-fares
{"title":"Using Vertical Electrical Soundings for Characterizing Hydrogeological and Tectonic Settings in Deir El-Adas Area, Yarmouk Basin, Syria","authors":"W. Al-fares","doi":"10.1515/acgeo-2016-0025","DOIUrl":"https://doi.org/10.1515/acgeo-2016-0025","url":null,"abstract":"The present study is aimed at characterizing the subsurface geological and tectonic structure in Deir El-Adas area, by using Vertical Electrical Sounding survey (VES) and hydrogeological investigations, in order to determine the causes of the failure for the majority of the wells drilled in the area. The survey data was treated in three different approaches including direct VES inversion, pseudo-2D method and horizontal profiling, in order to maximize the reliability of the data interpretation. The results revealed the presence of a local faulted anticline structure at the top of the Paleogene formation, underneath the basaltic outcrops where Deir El-Adas village is situated. The appearance of this subsurface anticline structure has complicated the local hydro-geological situation, and most likely led to limitation of the groundwater recharge in the area. Moreover, the performed piezometric and discharge maps indicated the presence of a notable groundwater watershed, in addition to feeble water productivity of the wells drilled adjacent to Deir El-Adas, mostly related to the subsurface geological and tectonic settings in the area.","PeriodicalId":50898,"journal":{"name":"Acta Geophysica","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2016-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/acgeo-2016-0025","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67088178","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}
引用次数: 5
Prospects for Solar and Space Weather Research with Polish Part of the LOFAR Telescope 利用LOFAR望远镜波兰部分进行太阳和空间天气研究的前景
IF 2.3 4区 地球科学
Acta Geophysica Pub Date : 2016-12-02 DOI: 10.1515/acgeo-2016-0028
B. Dabrowski, A. Krankowski, L. Blaszkiewicz, H. Rothkaehl
{"title":"Prospects for Solar and Space Weather Research with Polish Part of the LOFAR Telescope","authors":"B. Dabrowski, A. Krankowski, L. Blaszkiewicz, H. Rothkaehl","doi":"10.1515/acgeo-2016-0028","DOIUrl":"https://doi.org/10.1515/acgeo-2016-0028","url":null,"abstract":"The LOw-Frequency ARray (LOFAR) is a new radio interferometer that consists of an array of stations. Each of them is a phase array of dipole antennas. LOFAR stations are distributed mostly in the Netherlands, but also throughout Europe. In the article we discuss the possibility of using this instrument for solar and space weather studies, as well as ionosphere investigations. We are expecting that in the near future the LOFAR telescope will bring some interesting observations and discoveries in these fields. It will also help to observe solar active events that have a direct influence on the near-Earth space weather.","PeriodicalId":50898,"journal":{"name":"Acta Geophysica","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2016-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/acgeo-2016-0028","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67088423","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}
引用次数: 9
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