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Prototype autonomous earthquake locator for regional networks
Author(s) -
Pinsky V.
Publication year - 2000
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/1999gl011237
Subject(s) - epicenter , seismogram , earthquake location , seismology , geology , envelope (radar) , geodesy , maxima , arrival time , phase (matter) , computer science , grid , maxima and minima , algorithm , telecommunications , physics , induced seismicity , mathematics , art , mathematical analysis , radar , quantum mechanics , performance art , transport engineering , engineering , art history
A fully autonomous source location algorithm, which identifies the local earthquake P and S phases by finding the network seismogram envelope maxima P max and S max , is designed. These picks are approximated to theoretical travel times of the wavefield intensity by varying epicenter and origin time, thus providing initial estimates for source coordinates, origin time and phase onsets. Then the onsets are improved by detection of the time‐series discrepancy points with the subsequent fitting to the theoretical first arrival times for the final source location. Fitting is performed using a grid‐search robust optimization procedure based on the bell‐like factor functions. Application of the algorithm to 61 local earthquakes recorded by the Israel Seismic Network shows location accuracy of 3 km for epicenter and ±7 km for depth. For the four blasts from a quarry near the Dead Sea with known coordinates and ignition time the automatic locator provided accuracy of 0.3–1.7 km and even outperformed the analyst solutions.