REVISITING THE ۲۰ JUNE ۱۹۹۰ (MW ۷.۴) RUDBAREARTHQUAKE

The ۲۰ June ۱۹۹۰ earthquake in north Iran caused nearly ۵۰,۰۰۰ deaths. Although this earthquakehas been extensively studied, there are still numerous critical observations left unexplained, e.g., anabnormally wide and asymmetric aftershock distribution, and a rupture initiation point that is far fromthe inferred fault plane. These characteristics signify the complexity of the source rupture process ofthe event. Teleseismic body and surface waveforms are used to derive the earthquake’s coseismic slipdistribution and its rupture details. Stress transfer corresponding to the obtained slip distributiondelineates the unruptured faults with increased Coulomb stress. InSAR time-series analysis is used todelineate and comprehend the status of strain accumulation across the neighboring faults. The analysessuggest that the region to the east of the ۱۹۹۰ earthquake’s surface rupture is prone to futureearthquakes.

کلیدواژه ها:

Source Analysis ، InSAR ، Stress Transfer