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Distribution of slip from 11 M_w > 6 earthquakes in the northern Chile subduction zone

机译:智利北部俯冲带11 M_w> 6次地震的滑移分布

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摘要

We use interferometric synthetic aperture radar, GPS, and teleseismic data to constrain the relative location of coseismic slip from 11 earthquakes on the subduction interface in northern Chile (23°–25°S) between the years 1993 and 2000. We invert body wave waveforms and geodetic data both jointly and separately for the four largest earthquakes during this time period (1993 M_w 6.8; 1995 M_w 8.1; 1996 M_w 6.7; 1998 M_w 7.1). While the location of slip in the teleseismic-only, geodetic-only, and joint slip inversions is similar for the small earthquakes, there are differences for the 1995 M w 8.1 event, probably related to nonuniqueness of models that fit the teleseismic data. There is a consistent mislocation of the Harvard centroid moment tensor locations of many of the 6 < M w < 8 earthquakes by 30–50 km toward the trench. For all models, the teleseismic data are better able to resolve fine details of the earthquake slip distribution. The 1995 earthquake did not rupture to the maximum depth of the seismogenic zone (as defined by the other earthquakes). In addition to the above events, we use only teleseismic data to determine the rupture characteristics of four other M_w > 6 earthquakes, as well as three M_w > 7 events from the 1980s. All of these earthquakes appear to rupture different portions of the fault interface and do not rerupture a limited number of asperities.
机译:我们使用干涉合成孔径雷达,GPS和远震数据来约束1993年至2000年智利北部俯冲界面上11次地震的同震滑动的相对位置。我们反转体波波形和这段时期内四个最大地震的大地数据(1993 M_w 6.8; 1995 M_w 8.1; 1996 M_w 6.7; 1998 M_w 7.1)。尽管在小地震中​​仅在纯地震,仅大地测量和联合滑动反演中的滑移位置是相似的,但1995年Mw 8.1事件存在差异,这可能与适合于地震数据的模型的非唯一性有关。在距海沟30–50 km处发生的6次 6地震以及1980年代以来的三起M_w> 7地震的破裂特征。所有这些地震似乎都破坏了断层界面的不同部分,并且没有破坏有限数量的凹凸不平。

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