Slip model of the 2015 Mw 7.8 Gorkha (Nepal) earthquake from inversions of ALOS‐2 and GPS data
Slip model of the 2015 Mw 7.8 Gorkha (Nepal) earthquake from inversions of ALOS‐2 and GPS data
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DOI：
10.1002/2015gl065201
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发表时间：
2015-09
影响因子：
5.2
通讯作者：
Kang Wang;Y. Fialko
中科院分区：
文献类型：
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作者：
Kang Wang;Y. Fialko
我们使用地表变形测量数据，包括日本宇宙航空研究开发机构 ALOS-2 任务获取的干涉合成孔径雷达数据和全球定位系统 (GPS) 数据，来反演 2015 年尼泊尔 Mw 7.8 Gorkha 地震的断层几何形状和同震滑移分布。假设破裂断层与 84.34°E 至 86.19°E 之间的主锋面逆冲 (MFT) 断层的表面痕迹相连，则最佳拟合模型建议倾角为 7°。根据滑移模型计算出的力矩为 6.08 × 1020 Nm，对应力矩大小为 7.79。 2015年廓尔喀地震的破裂以逆冲运动为主，主要集中在主锋面逆冲（MFT）地表轨迹向北50至100公里长150公里的区域，最大滑动量约为5.8 m，深度约为8 km。因此，数据表明，2015 年廓尔喀地震使发震带的深层部分破裂，而 1934 年比哈尔邦-尼泊尔地震则使东部邻近断层段的浅层部分破裂。
We use surface deformation measurements including Interferometric Synthetic Aperture Radar data acquired by the ALOS‐2 mission of the Japanese Aerospace Exploration Agency and Global Positioning System (GPS) data to invert for the fault geometry and coseismic slip distribution of the 2015 Mw 7.8 Gorkha earthquake in Nepal. Assuming that the ruptured fault connects to the surface trace of the Main Frontal Thrust (MFT) fault between 84.34°E and 86.19°E, the best fitting model suggests a dip angle of 7°. The moment calculated from the slip model is 6.08 × 1020 Nm, corresponding to the moment magnitude of 7.79. The rupture of the 2015 Gorkha earthquake was dominated by thrust motion that was primarily concentrated in a 150 km long zone 50 to 100 km northward from the surface trace of the Main Frontal Thrust (MFT), with maximum slip of ∼ 5.8 m at a depth of ∼8 km. Data thus indicate that the 2015 Gorkha earthquake ruptured a deep part of the seismogenic zone, in contrast to the 1934 Bihar‐Nepal earthquake, which had ruptured a shallow part of the adjacent fault segment to the east.