Multiple-point source solution of 2020 Samos Mw7.0 earthquake in Greek was inverted using iterative deconvolution method from near field seismic records. The retrieving results have revealed that Samos Mw7.0 earthquake consisted of at least two subevent with similar normal fault-typing, the smaller subevent corresponds to ~3 s rupture time close to mainshock epicenter, the larger one has its position approximately 25 km west of the original rupture point with 8 s later moment release. We inferred that Samos earthquake occurred on a normal fault along the nearly EW trending, and two subevents successively ruptured separated by ~5 s. Furthermore, numerical simulation of the tsunami generated by Samos normal faulting earthquake was conducted from the uniform slip source model, indicating the Samos earthquake occurred as subsidence of normal fault hanging wall, and led to a large sudden coseismic vertical deformation surrounding the focal region, thus displacing the overlying water and produced a small scale local tsunami.
A massive Mw = 7.0 earthquake that occurred ~10 km to the north and offshore of Samos Island, Greece (37.897°N 26.784°E) On 30 October 2020 11:51 UTC, at a shallow depth of ~21 km. This earthquake caused extensive damage on its surrounding areas, resulted in the collapse of buildings, numerous fatalities, and missing people, at least ~117 people were killed by earthquake. Most notably, the mainshock also triggered a powerful local tsunami that flooded into the island of Samos Island, Greece and the Aegean coast of the Izmir region, Turkey, and caused severely damage to building and structure, one person killed by drowning.
After the Samos mainshock, the researchers from various earthquake agencies have made great progresses in understand this earthquake. The analysis of the mainshock and aftershock sequence reveals that it occurred on a nearly EW striking dip-slip normal fault located off the northern shore of Samos Island (Onder-Cetin et al., 2020; Papadimitriou et al. 2020). The distance between the USGS's initial epicenter and GCMT's centroid location is ~19 km (Fig. 1), indicating the the seismogenic zone is not considered to be single point source, the main rupture slip is located to west of the epicenter. The two major slip patches derived from the regional finite fault modeling. Hence, we employed the multiple-point source modeling to explore the focal mechanism characteristics, and further unveiling the temporal and spatial characteristics of the rupture.
