MEHMET KÖKÜM

Firat University, Geological Engineering, Faculty Member

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I am a PhD and RA at the Firat University in Turkey.I graduated from F.U. with a Bachelor's degree in Geology Science. Before joining Firat University in 2012, I received a M.S. from Indiana University in the USA. In particular, I focus on Kinematic Analysis (Paleostress) of the active fault by using fault slip data in order to explain past and present behaviors of the faults. I also use remote sensing techniques and digital elevation models to trace the geometry of an active fault.

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Cees van Westen

University of Twente, Faculty of Geoinformation Science and Earth Observation (ITC)

Hemin Koyi

Uppsala University

Stefano R L Campana

University of Siena / Università di Siena

Gabriel Gutierrez-Alonso

University of Salamanca

Alexandros Chatzipetros

Aristotle University of Thessaloniki

Paulo Emanuel T F Fonseca

Universidade de Lisboa

Md Ashraful Islam

University of Dhaka, Bangladesh

Beata Gruszka

Adam Mickiewicz University in Poznań

Stephen W Merkel

Vrije Universiteit Amsterdam

Ramazan Demirtaş

Ankara University

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Influence of fault rocks’ mineralogy on fault behaviour: implications from the Palu-Hazar Lake section of the East Anatolian Fault (Elazığ, Türkiye)

&lt;p&gt;The multi-disciplinary studies yield a more complicated picture on seismic cycle... more &lt;p&gt;The multi-disciplinary studies yield a more complicated picture on seismic cycles, especially with the increasing evidence on creeping, slow slip events, tremors and repeating earthquakes. Recent observations support triggering of large earthquakes even by small or slow earthquakes and creeping of different portions of the fault. The Palu-Hazar Lake section of the East Anatolian Fault (EAF) is an example place of such kind of behaviour, where the 24 January Mw 6.8 Sivrice Earthquake was nucleated along the neighbouring segments. This sinistral strike-slip fault forms the eastern boundary of the Anatolian &lt;em&gt;Scholle&lt;/em&gt; between Karl&amp;#305;ova (Bing&amp;#246;l) in the northeast and T&amp;#252;rko&amp;#287;lu (Kahramanmara&amp;#351;) in the southwest within the complex tectonic frame of the Eastern Mediterranean.&lt;/p&gt; &lt;p&gt;In this study, we aim to correlate any potential influence of bedrock lithology on this creeping section of the EAF. First, we revised the active fault and geological maps by using the multi spectral satellite images (e.g., Landsat 8 OLI) and high-resolution digital surface models (~0.65 m ground pixel resolution). Then, we determined potential exposures along the EAF and made systematic sampling both from cohesive and incohesive fault rock exposures within our study region. Collected samples are prepared for X-ray diffraction (XRD) measurements, especially for the determination of the fault clay types. Fault rock samples from ophiolitic (mafic and ultramafic) rocks and accretionary complexes (shale, sandstone, volcanics, ophiolite fragments) are mostly made of vermiculite and include minor amounts of smectite and chlorite according to our XRD measurements. Although the low shear strength of vermiculate may trigger aseismic slip at shallow depths with change in pore water pressure, it is possible that there may be no correlation between bedrock lithology and creeping, considering the poorly known seismic history of the EAF.&lt;/p&gt; &lt;p&gt;This study is supported by T&amp;#220;B&amp;#304;TAK Project no. 118Y435.&lt;/p&gt; &lt;p&gt;Keywords: earthquake, East Anatolian Fault, creep, fault rocks&lt;/p&gt;

February 6, 2023, Mw 7.8 and 7.6 Kahramanmaraş (Turkiye) Earthquake Sequence: Insights from Co-seismic and Post-seismic Surface Deformation

&lt;p&gt;On 6 February 2023, 04:17 in local time, Mw 7.8 earthquake and nine hours later,... more &lt;p&gt;On 6 February 2023, 04:17 in local time, Mw 7.8 earthquake and nine hours later, 13:24 in local time, Mw 7.7 earthquake struck the same region resulting a massive destruction with loss of lives more than 41,000 in T&amp;#252;rkiye and 4,000 Syria.&amp;#160; The earthquake took place on the East Anatolian Fault Zona (EAFZ) which is a plate boundary (~600 km) between the Anatolian and Arabian plates from Karl&amp;#305;ova triple junction between Arabian, Anatolian and Eurasian plates to the Dead Sea Fault Zone (DSFZ) and parts of another triple junction at the south end between Adana block, Anatolian and Arabian plates at Kahramanmara&amp;#351;. Secular plate velocities between Arabia and Anatolia range from 6 to 10 mm/yr and has resulted in destructive earthquakes in eastern Turkey as documented by historical records. The largest known earthquakes along the EAFZ occurred on November 29, 1114 (M &gt; 7.8), March 28, 1513 (M &gt; 7.4) and March 2, 1893 (M &gt; 7.1).&amp;#160; The activity of these large devastating historical earthquakes contrasts with the low-level activity during the 20&lt;sup&gt;th&lt;/sup&gt; century. The quiescence ended with the Mw 6.9 1971 Bing&amp;#246;l earthquake, which is followed about 50 year later by the Mw 6.9 January 24, 2020 Sivrice, Elaz&amp;#305;&amp;#287; earthquake that ruptured only 45&amp;#160;km of the 95&amp;#160;km long Sivrice-P&amp;#252;t&amp;#252;rge segment. With the latter event, seismicity accelerated along the rupture zone and activity moved towards to the SW.&lt;/p&gt; &lt;p&gt;Our aim is to monitor and estimate the co- and post- deformation field from geodetic measurements (InSAR and GNSS). While maximum co-seismic displacement at the ANTE GNSS station was 0.4 m in the first event (KMRS, Kahramanmaras), the biggest co-seismic displacement observed in the second event was 4.5 m in EKIZ (Ekinozu) station which is ~1.5 km away from the epicenter of the second earthquake. This co-seismic deformation field was estimated from open station of TUSAGA-Active GNNS Network. Following the earthquakes, we established three new continuous GNSS stations to monitor the postseismic deformation in Hatay province close to T&amp;#252;rko&amp;#287;lu segment of the East Anatolian Fault. Preliminary analysis indicates about 20 mm of postseismic deformation 10 days following the earthquakes. We have also conducted a GNSS campaign and occupied nearfield benchmarks. We will also monitor postseismic deformation using Sentinel and CosmoSkyMed SAR data field.&lt;/p&gt; &lt;p&gt;This work is supported by TUBITAK project number 121Y400 and 1002-C project &amp;#8220;Mw 7.7 Pazarcik (Kahramanmaras) Earthquake Sequence&amp;#8221;.&lt;/p&gt; &lt;p&gt;Keywords: 06.02.2023 Turkiye Earthquake Sequence, Kahramanmaras Earthquake, GNSS, InSAR, Coseismic and Postseismic Deformation&lt;/p&gt;

Earthquake Cycle of the East Anatolian Fault Between Palu-Erkenek (Eastern Türkiye): Insights of Tectonic Geodesy

&lt;p&gt;The East Anatolian Fault (EAF) is one of the continental transform systems in th... more &lt;p&gt;The East Anatolian Fault (EAF) is one of the continental transform systems in the Eastern Mediterranean, with a length of about 420 km between Karl&amp;#305;ova (Bing&amp;#246;l) in the northeast and T&amp;#252;rko&amp;#287;lu (Kahramanmara&amp;#351;). The 24 January 2020 Sivrice earthquake with Mw 6.8 once again demonstrated the seismic potential of this sinistral strike-slip fault.&lt;/p&gt; &lt;p&gt;The recent earthquakes and discoveries creeping along the Palu Segment (~100km far to the NE of epicenter of Mw6.8 earthquake) by geodesy- and seismology-based studies increase scientific attention. The spatio-temporal characteristics of the creep observed along the Palu Segment were investigated using nearfield GPS, InSAR, and creepmeter data. After Mw6.8 earthquake, we expanded our study area towards the P&amp;#252;t&amp;#252;rge Segment in the south to determine the postseismic effects of the 24 January 2020 earthquake and the kinematics of the P&amp;#252;t&amp;#252;rge Segment using multidisciplinary methods (GNSS, creepmeter, InSAR, seismology, paeloseismology) and to investigate the effects on the surrounding faults.&lt;/p&gt; &lt;p&gt;During the first year of the project work, a new GNSS network was established in the region and these networks will be regularly measured every six months. In addition, two permanent GNSS stations were installed. Additionally, using Sentinel-1 data sets, surface deformations mapped by PSINSAR analysis. Generally, post-earthquake effects continue and deformations moved to the SW part of unbroken part of P&amp;#252;t&amp;#252;rge segment and based on the creepmeter data, surface deformations still continue at the epicenter locations, following the logarithmic afterslip responce.&lt;/p&gt; &lt;p&gt;This work is supported by TUBITAK project number 121Y400.&lt;/p&gt; &lt;p&gt;&amp;#160;&lt;/p&gt; &lt;p&gt;Keywords: East Anatolian Fault, Earthquake, GNSS, InSAR&lt;/p&gt;

Investigating the characteristic properties of creeping along the Hazar-Palu Segment of the East Anatolian Fault, Turkey

AGU Fall Meeting Abstracts, Dec 1, 2019

Contributions of fault gouge mineralogy on aseismic creep of active faults: the East Anatolian Fault (Eastern Turkey) as a case study

MEHMET KÖKÜM

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