Detection and Classification of Volcanic Earthquakes/Tremors in Central Anatolian Volcanic Province

Central Anatolia has been characterized by active volcanism since ∼10 Ma which created the so called CentralAnatolia Volcanic Province (CAVP) where a series of volcanoes are located along the NE-SW trend. Thepetrological investigations reveal that the magma source in the CAVP has both subduction and asthenosphericsignature possibly due to tearing of ongoing northward subduction of African plate along Aegean and Cyprusarcs. Recently, a temporary seismic array was deployed within the scope of Continental Dynamics: CentralAnatolian Tectonics (CD-CAT) project and provided a unique opportunity to study the deep seismic signature ofthe CAVP. Passive seismic imaging efforts and magnetotellurics (MT) observations revealed low velocity and highconductivity zones supporting the presence of localized partial melt bodies beneath the CAVP at varying depths,especially around Mt. Hasan which exhibits both geological and archeological evidences for its eruption around7500 B.C. In Central Anatolia, local seismicity detected by the CD-CAT array coincides well with the activefaults zones. However, active or potentially active volcanoes within CAVP are characterized by the lack of seismicactivity. In this study, seismic data recorded by permanent stations of Regional Earthquake-Tsunami MonitoringCenter were combined with temporary seismic data collected by the CD-CAT array to improve sampling densityacross the CAVP. Later, the continuous seismic waveforms of randomly selected time intervals were manuallyanalyzed to identify initially undetected seismic sources which have signal characters matching to volcanicearthquakes/tremors. For candidate events, frequency spectrums are constructed to classify the sources accordingto their physical mechanisms. Preliminary results support the presence of both volcano-tectonic (VT) and low-period (LT) events within the CAVP. In the next stage, the spectral and polarization analyses techniques will beutilized to the entire seismic database to detect and classify the seismic source associated to volcanism, and iden-tified events will be relocated and jointly interpreted with subsurface features detected by seismic imaging and MT

Characterization of the co-seismic pattern and slip distribution of the February 06, 2023, Kahramanmaraş (Turkey) earthquakes (Mw 7.7 and Mw 7.6) with a dense GNSS network

Two consecutive earthquakes with the magnitudes of Mw 7.7 and 7.6 (February 06, 2023) occurred on the East Anatolian Fault Zone (EAFZ) segments and unfortunately resulted in significant devastation to human life and cities in Turkey and Syria. In this study, we aimed to analyse the co-seismic displacements and fault slip distributions of these seismic events. Our unique high-spatial-resolution Global Navigation Satellite System (GNSS) network (comprising 73 permanent GNSS stations and 40 campaign observation sites), providing the recent geodetic dataset for the region, allows better constraint of the co-seismic surface displacements and slip distributions of both earthquakes. The three largest total displacements were identified as 466 cm, 362 cm, and 360 cm. The Fault interactions along the EAFZ were obvious during the consecutive earthquakes. The ruptures mainly occurred in the left-lateral components of the fault segments, with the maximum slips of 7.25 m and 9.43 m for the first event along the EAFZ and the second event on the Çardak Fault, respectively