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Geophysical Observatory at the North Anatolian Fault

SABONET

In 1996 a permanent seismic network, the SApanca BOlu NETwork (SABONET) was deployed to investigate the seismic activity at the Karadere- and Düzce Fault east of the Sea of Marmara. This region currently represents the eastern end of a westward migrating earthquake sequence starting in 1939 in eastern Turkey.

The SABOnet in northwestern Turkey is jointly operated by GFZ and the Earthquake Research Department of the General Directorate of Disaster Affairs at Ankara.

Topographic map of the North Anatolian Fault Zone (NAFZ) in northwestern Turkey with the main tectonic and geological units including the surface rupture of the two M>7 Izmit and Düzce earthquakes of 1999. Faults are taken from Meghraoui et al. (2012). Fault plane solutions for the Izmit and Düzce events from Tibi et al. (2001) and surface ruptures after Barka et al. (2002). Inset: Regional tectonic setting of the Mediterranean Sea and GPS-derived relative plate motions with respect to stable Eurasia (black arrows) for the Anatolian and Arabian plates. EAF- East Anatolian Fault, DSF - Dead Sea Fault. Black lines indicate major tectonic plate boundaries. Faults modified after Schildgen et al. (2012).

The complete network, consisted of 15 short period stations, covers an area of about 220 km by 70 km with an average spacing of 20km (Milkereit et al., 2000; Baumbach et al., 2003; Bindi et al., 2007).

SABONET was operated in event triggering mode during the time period considered here (1997-2001) except for the 2-month Izmit aftershock sequence when it was switched to continuous recording. Data processing steps and detailed characteristics of the SABONET hypocenter catalogue parameters containing ~10.000 events are given in Ickrath et al. (2015) and Bohnhoff et al. (2016b).

Station map of the SApanca-BOlu NETwork (SABONET) along the Izmit and Düzce ruptures. Surface ruptures are indicated by the dotted light and dark red lines. Faults as above and after Saroglu (1985). Yellow triangles are individual seismic stations with the station names

Station ID Latitude (N) Longitude (E) Elevation (m)

AKC

 40.9723 31.2089

680

CAY

 40.6665 30.4315

291
CND 40.6665 31.1771

950
CIN 40.4360 30.3057

1100

DOK

 40.5579 30.8467

635
EKI 40.5440 31.0412

890
GOK 40.6052 31.1453

228

HEN

 40.6052 31.1453

590

KAR

40.8214

30.8986

260

KEL

40.6581

 30.1328

1150

TAB

40.6006

30.6147

400

YUT

40.8978

30.6001

147

OFL

40.9573

30.3771

350

ASA

40.6915

30.7199

228

ESE

40.7562

30.3167

374