Rupture pattern of the Oct 23, 2011 Van-Merkez,Eastern Turkey earthquake |
| |
| Authors: | Hao Zhang Zengxi Ge |
| |
| Institution: | 1. Department of Geophysics, School of Earth and Space Sciences, Peking University, Beijing, 100871, China
2. Department of Earth and Planetary Sciences, Northwestern University, 2145 Sheridan Rd, Evanston, IL, 60208, USA
|
| |
| Abstract: | High-frequency rupture process of the Oct 23, 2011 Van-Merkez earthquake is imaged by back-projection method using high-quality teleseismic P wave data from the US Array, and prestack Kirchhoff migration using P wave data from a subarray of global seismic networks. The rupture model with two asperities is confirmed by previous two methods. In low-frequency imaging, a large asperity derived from the migration method corresponds to the second one from the high-frequency P waves. The consistency of the locations of asperities from datasets with different frequency bands indicates that there is possible insignificance of the frequency-dependent feature for the earthquake. The resultant images illustrate the spatial and temporal evolution of the rupture, which mainly propagated WSW over a length of 33 km during the first 18 s, accompanying with bursts of two asperities at 3 and 11–13 s. The rupture direction is confirmed by the S wave corner frequency variations of strong ground accelerations. The rupture fronts are mainly located at the updip of the causative fault. Based on polarities of the P waveforms and focal mechanisms of the mainshock and aftershocks, the failure of these two asperities is determined to have occurred on a reverse fault with a dip angle of 47°. Hence, the rupture pattern of the 2011 Van-Merkez earthquake was dominated by a unilateral rupture toward the west-southwest direction. |
| |
| Keywords: | 2011 Van-Merkez earthquake Rupture pattern Back-projection Kirchhoff migration |
| 本文献已被 SpringerLink 等数据库收录！ |
| 点击此处可从《Earthquake Science》浏览原始摘要信息 |
| 点击此处可从《Earthquake Science》下载免费的PDF全文 |
|
