Abstract
The seismological characteristics of earthquake activity before and after January 24, 2020 (Mw6.8) Sivrice-Doğanyol earthquake were studied for the period between January 1, 2018 and August 6, 2020. Spatial and temporal distributions of epicenters of this activity, fault mechanism solutions and Gutenberg-Richter parameters (Mc, a- and b-values) show remarkable patterns. Mechanism solutions of Mw≥5.0 magnitude earthquakes prove that the Pütürge Fault is a left-lateral strike-slip fault with a northwest dipping plane. It was observed that the increase in Mc value before January 24, 2020 Sivrice-Doğanyol mainshock started simultaneously with a foreshock of Mw4.9 on December 27, 2019, 28 days before the main earthquake. The decrease trend in b-value started on September 8, 2019, 139 days before the mainshock, and on December 27, 2019, the b-value decreased to the lowest level of 0.6. The reason for the increase in Mc value and the significant decrease of the b-value before the January 24, 2020 Sivrice-Doğanyol earthquake may be the effect of the increase in the effective stress on the Pütürge Fault before the earthquake and the change in physical process. Similar findings can be considered as a pre-earthquake warning mechanism, as previously presented and discussed in many earthquake examples around the world.
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