Coseismic Slip from the 6 October 2008, Mw6.3 Damxung Earthquake, Tibetan Plateau, Constrained by InSAR Observations
نویسندگان
چکیده
Coseismic deformation fields of the 6 October 2008 Mw6.3 Damxung earthquake were obtained from interferometric synthetic aperture radar by using three descending and two ascending Envisat images. Significant coseismic surface deformation occurred within 20 km 9 20 km of the epicenter with a maximum displacement of *0.3 m along the satellite line of sight. We model a linear elastic dislocation in a homogeneous half space and use a nonlinear constraint optimized algorithm to estimate the fault location, geometry and slip distribution. The results indicate a moment magnitude Mw6.3, and the earthquake is dominated by oblique normal and right-lateral slip with a maximum slip of 2.86 m at depth of 8 km. The rupture plane is about 15 km 9 14 km with strike S190 W and dip 55 to NW, located at a secondary fault of the Southeastern Piedmont of the Nyainqentanglha Mountains. Slip on normal faults in the Tibetan Plateau contributes to the rift evolution.
منابع مشابه
A special issue on the great 12 May 2008 Wenchuan earthquake (Mw7.9): Observations and unanswered questions
The 12 May 2008 Wenchuan earthquake (Mw 7.9) ruptured the active Longmen Shan thrust belt bounding the eastern margin of the Tibetan plateau against the Sichuan basin (Fig. 1) (Burchfiel et al., 2008). Initial observations of this devastating earthquake were reported in several short papers focusing on coseismic slip and earthquake-fault geometry (e.g., Wang et al., 2008; Xu et al., 2009; Lin e...
متن کاملCoseismic Deformation and Slip Distribution of the 1997 Mw7.5 Manyi, Tibet, Earthquake from InSAR Measurements
We use interferometric synthetic aperture radar (InSAR) observations to investigate the coseismic deformation and slip distribution of the 1997 Mw7.5 Manyi earthquake, a left-lateral strike-slip earthquake occurred on the west portion of the Kunlun fault in the northern Tibet, China. The fault trace is constrained by the combination of interferometric coherence image and azimuth offset image. T...
متن کاملA New Perspective on Fault Geometry and Slip Distribution of the 2009 Dachaidan Mw 6.3 Earthquake from InSAR Observations
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 f...
متن کاملThe 1995 November 22, Mw 7.2 Gulf of Elat earthquake cycle revisited
S U M M A R Y The 1995 November 22, M w = 7.2 Nuweiba earthquake occurred along one of the left-stepping segments of the Dead Sea Transform (DST) in the Gulf of Elat (Aqaba). It was the largest earthquake along the DST in at least 160 yr. The main shock was preceded by earthquake swarms north and south of its NE-striking rupture since the early 1980s, and was followed by about 6 months of inten...
متن کاملCoseismic and postseismic deformation of the 2011 Tohoku-Oki earthquake constrained by GRACE gravimetry
[1] Spaceborne gravimetry data from the Gravity Recovery And Climate Experiment (GRACE) are processed using spatio-spectral Slepian localization analysis enabling the high-resolution detection of permanent gravity change associated with both coseismic and postseismic deformation resulting from the great 11 March 2011 Mw 9.0 TohokuOki earthquake. The GRACE observations are then used in a geophys...
متن کامل