A New Perspective on Fault Geometry and Slip Distribution of the 2009 Dachaidan Mw 6.3 Earthquake from InSAR Observations.
A New Perspective on Fault Geometry and Slip Distribution of the 2009 Dachaidan Mw 6.3 Earthquake from InSAR Observations.
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InSAR观测对2009年大柴旦Mw 6.3地震断层几何和滑移分布的新认识
DOI：
10.3390/s150716786
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发表时间：
2015-07-10
期刊：
影响因子：
--
通讯作者：
Fok HS
中科院分区：
文献类型：
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作者：
Liu Y;Xu C;Wen Y;Fok HS
2009年8月28日，青藏高原柴达木盆地北方边缘发生了6.3级地震。本研究利用319下行道和455上行道的Envisat ASAR图像，捕捉到这次地震的同震形变，表明地震断层破裂没有到达地表。然后，我们提出了一个四段断层模型，通过确定断层参数，然后反演滑动分布来研究同震形变。优选的断层模型表明，所有四个断层面的破裂深度主要在2.0 ~ 7.5 km之间，比以前的结果浅，最深可达~13 km，并且断层面上的滑动分布是复杂的，在4.1 ~ 4.9 km之间有三个滑动峰值，最大值为2.44 m。反演的大地矩为3.85 × 1018 Nm（Mw6.36）。2009年地震可能是由西北向东南单向破裂，在中段破裂最大。
On 28 August 2009, the northern margin of the Qaidam basin in the Tibet Plateau was ruptured by an Mw 6.3 earthquake. This study utilizes the Envisat ASAR images from descending Track 319 and ascending Track 455 for capturing the coseismic deformation resulting from this event, indicating that the earthquake fault rupture does not reach to the earth’s surface. We then propose a four-segmented fault model to investigate the coseismic deformation by determining the fault parameters, followed by inverting slip distribution. The preferred fault model shows that the rupture depths for all four fault planes mainly range from 2.0 km to 7.5 km, comparatively shallower than previous results up to ~13 km, and that the slip distribution on the fault plane is complex, exhibiting three slip peaks with a maximum of 2.44 m at a depth between 4.1 km and 4.9 km. The inverted geodetic moment is 3.85 × 1018 Nm (Mw 6.36). The 2009 event may rupture from the northwest to the southeast unilaterally, reaching the maximum at the central segment.