PRELIMINARY REPORT ON March 8, 2010 ELAZIG EARTHQUAKES (EASTHERN TURKEY) PREPARED BY EARTHQUAKE DEPARTMENT WORKING GROUPS*

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1 PRELIMINARY REPORT ON March 8, 1 ELAZIG EARTHQUAKES (EASTHERN TURKEY) PREPARED BY EARTHQUAKE DEPARTMENT WORKING GROUPS* * Disaster And Emergency Management Presıdency, Earthquake Department Presidency, Eskişehir Yolu 653, Lodumlu, Ankara, TURKEY An earthquake with magnitude ML=5.8 occurred at local time :3 on March 8, 1 at about 69 km East of Elazığ and 1 km South of Karakoçan town. Epicenteral coordinates of the earthquake is determined as N -.3 E with focal depth 5 km. The earthquake also was felt in the neighboring provinces of Diyarbakir, Tunceli and Bingol. At the same day, after this earthquake, another earthqauke occured at 9:7 (local time) in Elazığ-Palu (Eastern Turkey - Epicenteral coordinates: N,.1 E, Depth: 5 km). Magnitude is determined as ML=5.6 for this earthquake. These earthquakes occurred in Palu-Hazar lake segment of the East Anatolian Fault Sistem (EAFS) (Fig. 1 and ). According to the data were determined in DDA Ankara Center: Between the dates March 8 1, 183 aftershocks were determined with magnitude range. 5.. The number of earthquakes has been decreased by time. Aftershock distributions of the Elazığ Earthquakes concentrated in an area of approximately 5 km long in NE- SW direction (Fig. 3). After the :3 (Local Time) ML=5.8 and 9:7 (Local Time) ML=5.6 earthquakes, 5 larger aftershocks with magnitude M>, are occurred in the same day. Focal depths of aftershocks vary between 1 - km. Moment Tensor Solutions of the larger aftershock are shown in Fig.. Focal Mechanism solutions show a left-lateral strike slip faulting including normal component. This result consonant with structure of EAFS. Relavant graphs with aftershocks are given in Fig. 5, 6 and 7. And maximum acceleration values and largest ground acceleration are given in Fig. 8 and 9 Elazığ-Kovancılar region where the earthquake occurred, join in the first and second degree earthquake zone in the Earthquake Zoning Map of Turkey. According to the statement from Precidency, 1 person died in Okçular, Yukarı Demirci, Göçmezler, Kayalık, Yukarı Kanatlı Villages where near the epicenteral area, because of the heavily damaging their adobe brick house. Earthqauke activity of this region (and all of Turkey) has been observed in Earthqauke Department data center Ankara 7 day/ hours with 16 seismic station and 8 accelerometer. Obtained results has shared with public, press and relevant authorized ACCELARATION VALUES OF ELAZIG-KOVANCILAR (Ml=5.8) EARTHQAUKES No Station Equipment NS EW Vertical Distance of station City District Type (gal) (gal) (gal) to epicenter (km) 1 Adıyaman Merkez CMG-5TD Bingöl Merkez CMG-5TD Bingöl Karlıova CMG-5TD Batman Merkez CMG-5TD Diyarbakır Merkez CMG-5TD Elazığ Merkez CMG-5TD Elazığ Palu SM Mardin Merkez CMG-5TD /11

2 Figure 1: Segments of East Anatolian Fault Zone The earthquakes which occured in historical and insturmental period in Hazar-Sincik and Palu Hazar Segment are given below Hazar-Sincik Segment Palu-Hazar Segment Historical Period Insturmental Period (year) 1875 M=6.7 (year) 195 M=6.8 3 M=5.7 M=5.3 5 M=5. 7 M=5. Historical Period Insturmental Period (year) 187 M=7.1 (year) 191 M= M=5.1 /11

3 ERZİNCAN K TUNCELİ KAYSERİ ELAZIĞ 38.5 MALATYA 38 DİYARBAKIR ADIYAMAN KAHRAMANMARAŞ ADANA OSMANİYE GAZİANTEP ŞANLIURFA 36.5 ANTAKYA KİLİS. =<M< =<M<.. =<M< =<M< =<M< Figure : Map of over the M magnitude earthquakes (DAD) of EAFS and surrounding region between 19-8 (Tectonic lines are taken from Şaroğlu vd. 199) 3/11

4 Figure 3: Aftershocks distribution of the Elazıg earthquakes (March 8-1, 1) /11

5 Figure : Moment Tensor Solutions of Elazığ-Kovancılar and Palu Earthquakes and larger aftershocks (M ) 5/11

6 /3/1 13:1 8/3/1 :3 8/3/1 3:1 8/3/1 3: 8/3/1 3:5 8/3/1 :1 8/3/1 : 8/3/1 5: 8/3/1 5:9 8/3/1 6:5 8/3/1 6:3 8/3/1 7:7 8/3/1 8:11 8/3/1 8:9 8/3/1 8:58 8/3/1 9:1 8/3/1 9:5 8/3/1 1:7 8/3/1 1:33 8/3/1 11: 8/3/1 11:7 8/3/1 1: 8/3/1 1:9 8/3/1 13:1 8/3/1 1:51 8/3/1 15:17 8/3/1 16:5 8/3/1 18:1 8/3/1 :18 8/3/1 :3 9/3/1 1:3 9/3/1 :17 9/3/1 7:1 9/3/1 1:3 Magnitude 9/3/1 1:53 1/3/1 :8 1/3/1 :59 Time Figure 5: 8/3/1 Elazığ-Kovancılar Earthquake (M=5.8) Time-Magnitude Graph 6/11

7 Number M <.. <= M < <= M <.. <= M < <= M < <= M < 7. M >= 7. Magnitude Figure 6: 8/3/1 Elazığ-Kovancılar Earthquake (M=5.8) Magnitude-Number Graph 7/11

8 8/3/1 Elazığ-Kovancılar Earthquake (M=5.8) Time-Number of Earthqauke Graph /3/ /3/ Numberı /3/ Time Figure 7: 8/3/1 Elazığ-Kovancılar Earthquake (M=5.8) Time-Number of Earthquake Graph 8/11

9 Figure 8: Maximum Acceleration Values of Elazığ-Kovancılar Earthquake (Ml=5.8) 9/11

10 Figure 9: Maximum Acceleration Values of Elazığ-Palu Earthquake (Ml=5.6) 1/11

11 Figure 1: Largest Ground Acceleration Distribution Map of Elazığ Earthquakes (Ml=5.8) 11/11