8 March 2010 Karakocan (Elazıg, Turkey) Earthquake (ML=5.9) (Türkçe)
TÜBİTAK Marmara Research Center (Earth and Marine Sciences Institute) is leading and coordinating the multilateral earthquake research project "Multi-Disciplinary Earthquake Researches in High Risk Regions of Turkey Representing Different Tectonic Regimes" (TÜRDEP) since 2005. The consortium members of the project are the Ministry of Construction and Settlement, Turkish Emergency Management Agency (formerly General Directorate of Disaster Affairs (GDDA)) and 14 Turkish universities. The initiative of the project is to achieve multidisciplinary earthquake studies in the Marmara Sea/Istanbul, East Anatolian Fault System (EAFS) and the Aegean Extensional System (EAS) regions. The continuously run monitoring stations under the scope of the project near the epicentral area is given in Figure 2.
The goal of the newly formed team is to carry out required in situ measurements to determine the location of the destructive aftershock(s) and to inform the authorities and the public with the first evaluations and results.
TUBITAK Marmara Research Center DEPAR team departed to Elazig approx. 5 hours after the event to setup additional observation stations in the epicentral area (Figure 3a). In under 24 hours the team have started deploying new seismometers (Figure 3b) that will help us track the aftershock activity both spatially and temporally.
|Figure 3a: DEPAR team en route to Elazığ|
|Figure 3b: Images from the Station installation work and the destructive effects of earthquake|
In figure 4a, the blue station codes show the temporary observation stations ARIN (Arındık), DEMR (Demirci), AOVA (Aşağıovacık), KURU (Kurucak), ISAG (İsaağa), and ARDI (Ardıçtepe) which were installed by the TÜBİTAK MRC EMSI team in 24 hours following the event. The PALD (Palu) station shown with the red station code is the easternmost station of the EAFZ seismological network operated under the TÜRDEP project of our institute. The bigger green star is the epicenter of the mainshock.
Figure 4b shows the M>2.8 aftershock activity recorded by the same stations.
The Coulomb stress change after the mainshock is given in Figure 4c.
The EAFZ is observed continuously as a couple of segments between northeast of the Hazar Lake and the Gökdere village. The right-stepping geometry on the northeast of Palu (Elazığ) causes a transpressional area between Gökdere and Genç (Bingöl) (Şaroğlu et al., 1987).
The preliminary results obtained by the DEPAR aftershock monitoring campaign shows that the earthquake has a lef-lateral mechanism and indicates a faulting along the EAFZ. Detailed focal mechanism parameters will be published in the following days.
The historical earthquakes known to rupture the East Anatolian Fault Zone and the associated fault segments are shown in Figure 5 (the numbers above denote the date of the events, the number below is the time passed since that event in years)