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Abstract:
On February 6th, 2023, a magnitude 7.8 earthquake struck near the city of Gaziantep and likely ruptured up to 300 km along the East Anatolian Fault Zone (EAFZ). It was followed 9 hours later by a second magnitude 7.5 event near Ekinözü in the Kahramanmaraş Province. Both events created a huge swath of devastation in southcentral Turkey and western Syria, likely well exceeding the casualties and damages caused by the 1999 Izmit-Duzce earthquake sequence. Both events are followed by numerous aftershocks along and around the surface rupture zones; and many regions in the Mediterranean, Middle East and Eastern Europe appear to be light up by small to moderate-size earthquakes in the next few days to weeks following these events. In this study, we focus on examining remote dynamic triggering in several tectonically active regions during and shortly following the large-amplitude surface waves of both mainshocks. We use both visual inspection and automatic method to quantify whether there is clear evidence of statistically significant increase of high-frequency radiations that are likely attributed to either shallow earthquakes or deep tectonic tremor. In places where multiple stations are close, we also attempt to locate them, based either on P or S arrival times or envelope cross-correlations. Our preliminary results have shown several new regions with possible evidence of triggered tremor, indicating that tremor can be observed at a more diverse tectonic region than previously thought. Updated results will be presented at the meeting.
