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| Titel |
Imaging Fluid-Rich Zones by Magnetotelluric Method at South Marmara Region, Turkey |
| VerfasserIn |
Özlem Cengiz, Sabri Bülent Tank, Elif Tolak Çiftçi, Tülay Kaya, Yasuo Ogawa, Yoshimori Honkura, Mustafa Kemal Tunçer, Masaki Matsushima, Naoto Oshiman, Cengiz Çelik |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250072049
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| Zusammenfassung |
| After the mainshock of 1999 Ä°zmit (Turkey) earthquake, scientists have undertaken various
kinds of observations in the Marmara region in order to increase understanding of crustal
properties of North Anatolian Fault Zone (NAFZ). Most of these studies focused on the east
Marmara region since the destructive earthquakes were occurring there. Considering the
westward migration of significant earthquakes on the North Anatolian Fault (NAF), the next
destructive earthquake is likely to occur beyond the westernmost part of 1999 Ä°zmit
earthquake epicenter, in or around Marmara Sea. For this reason, south of Marmara Sea was
chosen as the survey area.
Wide-band (320-0.0005 Hz) magnetotelluric (MT) data at sixteen sounding locations
along two parallel profiles at south Marmara region were collected to improve the
understanding of the crustal electrical conductivity structure. Both profiles are crossing
several branches of North Anatolian Fault. The results were achieved by performing
two-dimensional (2D) inversions of MT data with the transverse electric (TE) and transverse
magnetic (TM) modes. These results show a relatively complex structure down to 4 km
depth. The electrical resistivity pattern below this depth indicates a simpler structure with
conductors (10 Ωm) beneath the northern ends of both profiles. While these deep
conductive zones are attributed to partially melting in the crust, the highly resistive
zones are associated with low fluid condition and high rigidity. In addition, the
features characterized in geo-electric models correlate well with known faults in the
survey area. The South Marmara Fault (SMF) possibly corresponds to a lateral
resistive-conductive interface between Manyas-Karacabey basin and Bandirma-Karadağ
uplift on the west (PW) and Uluabat uplift and Mudanya uplift on the east (PE)
profiles. |
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