Exact(13)
Although all of these postseismic processes are likely present and compensate each other at times, we hypothesize the viscoelastic relaxation triggered by the partially ruptured elastic lithosphere is a main driver of the local subsidence above the rupture region.
Fig. 1 Overview map of the 2015 Gorkha Earthquake rupture region, based on Figure 1 of Angster et al. (2015).
An earthquake leads to a stress increase around the rupture region, which may either trigger another earthquake or induce afterslips.
The slip in aftershock 1 is found around the northern edge of the main rupture region, and its moment magnitude is estimated to be 7.5.
For example, Uchida et al. (2009) suggested that afterslip east of the 2003 Tokachi-oki earthquake rupture region had propagated eastward and triggered the 2004 Kushiro-oki earthquake.
Thirdly, significantly smaller earthquakes, such as the 1978 off-Miyagi earthquake, have occurred inside of the rupture region of the mainshock.
Similar(47)
The coseismic stress perturbation results suggest that the ΔCFS due to the Kaikoura earthquake can reach several MPa around mainshock rupture regions.
Afterslip describes postseismic ongoing aseismic fault motions occurring on or beneath mainshock rupture regions over several months to several years (Huang et al. 2014).
According to the rupture time periods on each subfault, we marked the rupture regions corresponding to Periods I, II, and III by a red rectangle (Region I), green rectangle (Region II), and blue rectangle (Region III), respectively, in Fig. 8b.
We only utilized GPS stations of a region with a longitude range of 170.2°E 176.5°E and latitude range of 40.0°S 44.0°S, considering insignificant contributions of postseismic fault movements to the deformation of GPS observations away from mainshock rupture regions.
In the deep regions (17 km depth) of shallow crustal faults, most of the mainshock rupture regions experienced loaded stress changes, which contributed to the occurrence of most aftershocks.
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