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摘要
Modelling of ground deformation was performed based on GPS measurements that were collected in the western part of Cephalonia (Paliki Peninsula) which had experienced two moderate magnitude earthquakes in early 2014. Both events of magnitudes Mw = 6.1 (Jan. 26) and Mw = 5.9 (Feb. 3) had the same right-lateral character of motion with a small thrust component, but different focal depth of 16 km and 5 km, respectively. The GPS results show large amplitudes of displacement in both horizontal (6-40 cm) and vertical (8-15 cm) components in the vicinity of Paliki for the period 2010-2014, which is attributed primarily to those earthquakes. Various scenarios of activated faults were considered to model the observed ground deformation that was associated with those events. The most plausible case that accounts for a realistic and best-fit approximation of the measured displacement vectors has a solution of two activated faults of SSW-NNE trending direction that are separated by a small offset. Consistent with the lack of surface exposure of the seismogenic faults, the best-fit model assumes two easterly dipping fault planes at burial depths of 0.8 km and 0.5 km and at angles of 72 degrees and 65 degrees, respectively. The GPS deduced models clearly resolved the plane ambiguities associated with the focal mechanism solutions of the two major events. A small "normal-fault" component along the upper part of the fault planes should be considered to further improve the best-fit approximation of the observed vertical deformation. It was also found that a non-negligible deformational component from aftershocks is inherent in the observed data mainly from Paliki.
- 出版日期2015-3-16
