Full text loading...
-
Grid Search Method For Hypocenter Location In A Homogenous Half-Space
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 9th Congress of the Balkan Geophysical Society, Nov 2017, Volume 2017, p.1 - 5
Abstract
Summary
“Grid Search Method” is an earthquake location method that is less known compared to Geiger’s method. In this study, we analyzed this method for its efficiency and capability in solving location problems in various situations. We first applied this technique to the synthetic arrival times for various epicentral locations (z = 0 km as focal depth) where the events occurred inside, near and outside the seismic network under ideal conditions (i.e., well-known velocity and no reading errors or background noise). Then, the same processes were undertaken for different hypocentral depths. In addition, the efficiency of the method was evaluated in various other situations including improperly determined velocity value of the crust, incorrectly handled origin time, and arrival times with a random Gaussian noise up to 30 %). Moreover, in order to simulate real situations encountered in a seismological center, we computed synthetic seismograms with crustal phases for a seismic network. These seismograms were generated by simply placing a damped sinusoidal wavelet on the arrival times of local phases calculated based on the assumed velocity model and adding random Gaussian noise.
© EAGE Publications BV