Relations between the GNSS, InSAR, and the other techniques for prediction of earthquakes
- PDF / 14,892,675 Bytes
- 12 Pages / 595.276 x 790.866 pts Page_size
- 60 Downloads / 166 Views
ORIGINAL PAPER
Relations between the GNSS, InSAR, and the other techniques for prediction of earthquakes Ahmet Y. Ürüşan
Received: 21 May 2014 / Accepted: 7 October 2014 # Saudi Society for Geosciences 2014
Abstract It is a well-known fact that the earthquakes have a lot of different parameters. Modern technology allows us to observe an important part of these settings. For example, when an earthquake occurs, its location, time, and depth, etc., values are measured by a seismometer. Recently, using the modern technologies, Global Positioning System (GPS) and Interferometric Synthetic Aperture Radar (InSAR) give us a chance to predict earthquakes in the short or long term. For avoiding the destruction the force of an earthquake can bring to human beings, it is inevitable to use the newer techniques. To predict out about the expected main shock, someone must begin to study firstly earthquakes which have already occurred. In this research, the seismometer and acceleration-meter data have been evaluated and compared by the geodetic measuring data of the InSAR and GPS data for Van earthquake on 23 October 2011. The area of research made out by the InSAR technique and the deformations produced by the GPS technique are being tested under centimeter precision. Additionally, the ionospheric total electron content values obtained by the GPS method have been considered, and the ionospheric distortions acquired from the closest Continuously Operating Reference StationsTurkey stations, particularly Muradiye station, have been observed. Also, they have been interpreted geophysically.
Keywords Earthquake . Seismometer . InSAR . GNSS . Ionosphere
Introduction The African and Arabian plates are located at the southwest and south of Turkey. These plates subduct and compress the Anatolian plate to move toward northeast and north, respectively. Their speeds are 27 and 9 mm/year whereas there is the larger Eurasian plate north of Turkey having extremely low velocity, including the Pontides which drifts towards east (to Kuril–Japan–Ryukyu–Philippine–Sulawesi freedom field). Thus, the middle and west Anatolia blocks that are excluded from the north Anatolian mounts and autochthonous Arabia, due to the Crete and Cyprus decompression, have to move towards the west and southwest and creates two faults, namely the North Anatolian Fault Zone (NAFZ) and East Anatolian Fault Zone (EAFZ) (Barka 1992). Therefore, Turkey becomes a primary country in which lives destructive earthquakes in the region. Because of these two fault zones, there occurs an effect of expansion of the tectonic regime in Aegean region and the compressional regime in Eastern Anatolia region. Both the Aegean and Eastern Anatolia regions have been witnessing devastating earthquakes. As a result of compression of the plates, intra-plate earthquakes have been observed time after time. Some examples to this type of earthquakes are that of Kirsehir in 1938 (Ms =6.8), Yenice-Gonen in 1953 (7.4), and the Caldiran in 1976 (Ms =7.1) (Gundogdu 1986). Absolute velocities and directi
Data Loading...
