The relationship between seismicity and fault structure on the Discovery transform fault, East Pacific Rise

The relationship between seismicity and fault structure on the Discovery transform fault, East Pacific Rise
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东太平洋海隆发现转换断层地震活动与断层结构之间的关系

DOI:
10.1002/2014gc005445
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发表时间:
2014
期刊:
Geosystems
影响因子:
--
通讯作者:
Collins, John A.
Collins, John A.
中科院分区:
--
文献类型:
--
作者:
Wolfson-Schwehr, Monica;Boettcher, Margaret S.;McGuire, Jeffrey J.;Collins, John A.

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在大洋中脊转换断层上有一个全球性的地震矩赤字,这些断层上最大的地震不会破坏整个断层区域。我们探讨了物理断层结构的影响,包括断层迹线中的跨越,对东太平洋海隆4S发现转换断层的地震行为的影响。2008年海底地震仪部署期间记录的一年微震活动(24,377次0ML4.6地震)和24年Mw 5.4从全球质心矩张量目录中获得的地震与高分辨率多波束测深描绘的地表断层结构相关。每一个15 5.4 MW 6.0 1990年1月1日至2014年4月1日期间在发现号上发生的地震使用地震表面波互相关技术重新定位到五个不同的破裂补丁之一。使用HypoDD重新定位算法重新定位微震活动。发现区西部断层段(DW)由三个不同构造和地震活动的区域组成:一个没有大地震和丰富的微震活动的区域,一个大地震完全耦合的区域,和一个多断层带和丰富的地震活动的复杂区域。一般来说,在大的、重复的地震所定义的小块区域内,微震活动会减少。虽然DW上的大破裂斑块的范围与水深测量中的物理特征相关,但在斑块边界处未观察到主断层迹线中的台阶,这表明断层带属性中的沿着走向不均匀性控制了大事件的大小和位置。
There is a global seismic moment deficit on mid‐ocean ridge transform faults, and the largest earthquakes on these faults do not rupture the full fault area. We explore the influence of physical fault structure, including step‐overs in the fault trace, on the seismic behavior of the Discovery transform fault, 4S on the East Pacific Rise. One year of microseismicity recorded during a 2008 ocean bottom seismograph deployment (24,377 0ML4.6 earthquakes) and 24 years of Mw 5.4 earthquakes obtained from the Global Centroid Moment Tensor catalog, are correlated with surface fault structure delineated from high‐resolution multibeam bathymetry. Each of the 15 5.4 Mw 6.0 earthquakes that occurred on Discovery between 1 January 1990 and 1 April 2014 was relocated into one of five distinct rupture patches using a teleseismic surface wave cross‐correlation technique. Microseismicity was relocated using the HypoDD relocation algorithm. The western fault segment of Discovery (DW) is composed of three zones of varying structure and seismic behavior: a zone with no large events and abundant microseismicity, a fully coupled zone with large earthquakes, and a complex zone with multiple fault strands and abundant seismicity. In general, microseismicity is reduced within the patches defined by the large, repeating earthquakes. While the extent of the large rupture patches on DW correlates with physical features in the bathymetry, step‐overs in the primary fault trace are not observed at patch boundaries, suggesting along‐strike heterogeneity in fault zone properties controls the size and location of the large events.
快速滑移断裂带中存在多个密集的转换断层
DOI: --
发表时间: 1983
期刊:
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东太平洋海隆戈法尔转换断层沿线地震破裂特性的变化
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期刊: Nature Geoscience
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