Seismic sequence near Zakynthos Island,Greece, April 2006: Identification of the activated fault plane |
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| Authors: | A Serpetsidaki E Sokos G-A Tselentis J Zahradnik |
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| Institution: | 1. National Observatory of Athens, Institute of Geodynamics, Lofos Nymfon, Thission, 11810 Athens, Greece;2. National Observatory of Athens, Institute of Astronomy, Astrophysics, Space Applications and Remote Sensing, Vas. Pavlou & I. Metaxa, GR-15 236 Penteli, Greece;3. National and Kapodistrian University of Athens, Faculty of Geology and Geoenvironment, University Campus- Zografou, Athens GR 157 84, Greece;4. Aristotle University of Thessaloniki, School of Geology, GR-541 24 Thessaloniki, Greece;5. Istituto Nazionale di Geofisica e VulcanologiaINGV, Via di Vigna Murata, 605 00143, Roma, Italy;6. Harokopeio University of Athens, Dep. of Geography, El. Venizelou Ave, 70, GR 176 76, Kallithea, Greece;7. Koronidos Str., 42131, Trikala, Greece;8. Ecole Normale Supérieure, PSL research University, Laboratoire de Géologie - UMR CNRS 8538, Paris, France;1. 9 Koronidos Str., 42100 Trikala, Greece;2. Institute of Geodynamics, National Observatory of Athens, 11810 Athens, Greece;3. Department of Geology, Aristotle University of Thessaloniki, Greece;1. CAS Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China;2. Department of Geophysics, Tohoku University, Sendai 980-8578, Japan;3. Institute of Deep-Sea Science and Engineering, Chinese Academy of Sciences, Sanya 572000, China;4. CNOOC Nanhai East Petroleum Bureau, Shenzhen, Guangdong 518054, China |
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| Abstract: | The April 2006 earthquake sequence near Zakynthos (Western Greece) is analysed to identify the fault plane(-s). The sequence (33 events) was relocated to assess physical insight into the hypocenter uncertainty. Moment tensor solution of three major events was performed, simultaneously with the determination of the centroid position. Joint analysis of the hypocenter position, centroid position and nodal planes indicated sub-horizontal fault planes. Moment tensor solutions of 15 smaller events were performed under assumption that the source positions are those of the hypocenters (without seeking centroids). Their focal mechanisms are highly similar and agree with the analysis of the three major events. The preferable seismotectonic interpretation is that the whole sequence activated a single sub-horizontal fault zone at a depth of about 13 km, corresponding to the interplate subduction boundary. Considering that the Ionian Sea is a high-seismicity area, the identification of the seismic fault is significant for the seismic hazard investigation of the region. |
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