高加索地区地震活动性的重新定位

IF 2.6 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
István Bondár, Tea Godoladze, Eric Cowgill, Gurban Yetirmishli, Stephen C. Myers, Irakli Gunia, Albert Buzaladze, Barbara Czecze, Tuna Onur, Rengin Gök, Andrea Chiang
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引用次数: 0

摘要

我们的目标是利用1951年至2019年期间的仪器数据改善高加索地区地震活动性的看法。为了创建一个全面的目录,我们结合了当地机构和国际地震中心的公告,并使用先进的单事件定位算法iLoc,以获得更好的位置。我们发现,利用三维上地幔速度模型(区域地震走时)的走时预测,利用iLoc进行重新定位,可以改善位置。然后,以iLoc结果作为初始位置,将iLoc结果中识别的地真事件作为固定点,应用Bayesloc多事件定位算法同时重新定位高加索地区的整个地震活动。我们证明,与Bayesloc同时重新定位的地震活动澄清了主要活动构造的位置和几何形状,这些构造容纳了黑海和里海之间阿拉伯和欧亚大陆之间正在进行的收敛。我们的主要发现之一是确认了由于库拉盆地和南里海盆地的北倾俯冲,大高加索北部和里海中部的地幔中存在广泛的地震活动,并确定了大高加索南部的地壳地震活动的离散带。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Relocation of the Seismicity of the Caucasus Region
ABSTRACT Our objective is to improve the view of the seismicity in the Caucasus region using instrumental data between 1951 and 2019. To create a comprehensive catalog, we combine the bulletins of local agencies and the International Seismological Centre, and use an advanced single-event location algorithm, iLoc, to obtain better locations. We show that relocations with iLoc, using travel-time predictions from the 3D upper mantle velocity model, Regional Seismic Travel Time, improve the locations. Then, using the iLoc results as initial locations and the ground-truth events identified in the iLoc results as fix points, we apply Bayesloc, a multiple-event location algorithm, to simultaneously relocate the entire seismicity of the Caucasus region. We demonstrate that the simultaneous relocation of the seismicity with Bayesloc clarifies the location and geometry of major active structures accommodating ongoing convergence between the Arabian and Eurasian continents between the Black and Caspian Seas. Among our major findings is the confirmation of widespread seismicity in the mantle beneath the northern flank of the Greater Caucasus and central Caspian, resulting from north-dipping subduction of the Kura and South Caspian basins and the identification of a discrete band of crustal seismicity beneath the southern flank of the Greater Caucasus.
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来源期刊
Bulletin of the Seismological Society of America
Bulletin of the Seismological Society of America 地学-地球化学与地球物理
CiteScore
5.80
自引率
13.30%
发文量
140
审稿时长
3 months
期刊介绍: The Bulletin of the Seismological Society of America, commonly referred to as BSSA, (ISSN 0037-1106) is the premier journal of advanced research in earthquake seismology and related disciplines. It first appeared in 1911 and became a bimonthly in 1963. Each issue is composed of scientific papers on the various aspects of seismology, including investigation of specific earthquakes, theoretical and observational studies of seismic waves, inverse methods for determining the structure of the Earth or the dynamics of the earthquake source, seismometry, earthquake hazard and risk estimation, seismotectonics, and earthquake engineering. Special issues focus on important earthquakes or rapidly changing topics in seismology. BSSA is published by the Seismological Society of America.
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