Monitoring Pre-seismic Stage of Future Large Earthquakes Offshore Istanbul
Abstract
The North Anatolian Fault Zone in the Sea of Marmara did not generate a M ³ 7.0 earthquake since 1766. This fault section hosts a ~25 mm slip rate and stores ~10 mm slip deficit per year. It is therefore expected to accommodate at least two at four M ³ 7.0 in near future to release its present date strain energy. In this study, we continuously monitor this critically strained fault section using seismo-geodetic stations that are equipped with 100Hz sampling seismographs and 1Hz sampling GPS receivers. This configuration allows covering a broad spectral band and therefore is sensitive to both fast/slow tectonic motions at large/small temporal and spatial scale, from milliseconds to years, from centimeters to tens of kilometers. In this frame, recorded seismo-geodetic data is used to identify (1) along-fault variation of the slip deficit, (2) fault segmentation, (3) interaction between slip-deficit and background seismicity, (4) pre-seismic seismo-geodetic symptoms and (5) co-seismic slip in case of M ³ 7.0 type earthquake(s).
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2019
- Bibcode:
- 2019AGUFM.G41B0722O
- Keywords:
-
- 1209 Tectonic deformation;
- GEODESY AND GRAVITY;
- 1525 Paleomagnetism applied to tectonics: regional;
- global;
- GEOMAGNETISM AND PALEOMAGNETISM;
- 3040 Plate tectonics;
- MARINE GEOLOGY AND GEOPHYSICS;
- 7230 Seismicity and tectonics;
- SEISMOLOGY