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Prince Islands Real-time Earthquake monitoring System (PIRES)

 

To monitor the microseismic activity in the North Anatolian Fault Zone offshore of Istanbul below the Çinarcik Basin (ÇB) a permanent seismic array (see PDF) was installed on the Prince Islands in 2006, at a very close proximity to the main fault.

PIRES initially consisted of two 5-station sub-arrays installed on the two outermost islands (Yassiada and Sivriada) of the Princes Islands group offshore Istanbul (see insets below). PIRES has later been enlarged towards the other Princes Islands in order to improve the azimuthal control of the focal area now consisting of 16 stations on a total of seven islands. We additionally integrate data from local permanent stations of the Turkish network (KOERI) and the ARNET seismic network. Combined data allowed obtaining a well-resolved scale for the hypocentral map to better understand the existing seismically active structures and their role in local tectonic settings. This allowed resolving the major fault branches beneath the ÇB providing insights into separation of seismically active/inactive segments along the western seismic gap and down-dip geometry of the seismically active faults.

Spatiotemporal analysis of the seismicity based on well-constrained hypocenters is performed to understand the interaction between the sub-segments of the NAFZ along the ÇB.

Station IDLatitude (N)Longitude (E)Elevation (m)

BASD

40.8637

29.1240

127

BRGZ

40.8810

29.0642

86

BYZN

40.8748

28.9735

18

EASY

40.8747

28.9713

10

FUTB

40.8649 

28.9934

33

GARD

40.8660

28.9938

7

HYBL

40.8680

29.0852

32

KNAL

40.9035

29.0458

8

KRGZ

40.8421

29.1107

10

MRTI

40.8196

29.1127

20

NRTH

40.8763

28.9708

2

OILH

40.8636

28.9921

9

PIER

40.8645

28.9949

16

POWD

40.8754

28.9722

9

SCRP

40.8653

28.9918

38

SHTH

40.8767

28.9729

8