Accession Number : ADP204511

Title :   Detection, Location and Discrimination of Seismic Events by the Seismic Network of Israel,

Corporate Author : PHILLIPS LAB HANSCOM AFB MA

Personal Author(s) : Shapira, A. ; Gitterman, Y. ; Pinsky, V. ; Malitzky, A.

PDF Url : ADP204511

Report Date : 14 AUG 1995

Pagination or Media Count : 9

Abstract : The Israeli Seismic Network (ISN) consists of 36 short period stations distributed throughout the country. In addition, a Broad Band station is operating at the geophysical observatory near Bar Giyyora, Israel (BGIO) and a small aperture seismic array is under construction in the central Negev desert. The ISN is a regional network which aims to monitor the seismicity in the area bounded by latitudes 27.ON - 36.0N and longitudes 32.0E - 38.OE. It is tuned to detect all seismic events of magnitudes ML>2.0 occurring in Israel. Triggered events are routinely analyzed, yielding a seismological bulletin which provides the seismic event source parameters and classifies the events as earthquakes, explosions, possible explosions and distant events. The detection capabilities of the ISN within Israel is proven to be ML>2.0. In many locations around the country, the threshold magnitude is as low as 0.5. Comparisons of the detection performance of the ISN with those of other international organizations has shown the superiority of the ISN in monitoring the eastern Mediterranean and Middle East regions. Less than 10% of the events detected by the ISN are local and regional earthquakes. Most of the detected events are quarry blasts in Israel, Lebanon and Jordan and detonations associated with infrastructure developments. Sonic wave detectors are used to identify quarry blasts. In parallel, ground truth information is used do develop analytical procedures for discrimination. Presently, the azimuth-invariant, low-frequency spectral modulation method is used to identify the quarry blasts and underwater explosions (UWE) caused by ripple firing and bubbling effects, respectively.

Descriptors :   *SEISMIC DETECTION, *SEISMIC WAVES, *ARMS CONTROL, *NUCLEAR EXPLOSION DETECTION, *SEISMIC DISCRIMINATION, LEBANON, ISRAEL, JORDAN, POSITION(LOCATION), SYMPOSIA, VERIFICATION, MONITORING, UNDERGROUND EXPLOSIONS, NUCLEAR EXPLOSION TESTING, MINING ENGINEERING, TREATIES, EARTHQUAKES, GEOPHYSICS, UNDERWATER EXPLOSIONS, SEISMIC ARRAYS, SURFACE TRUTH, ACOUSTIC DETECTORS, SEISMOLOGICAL STATIONS.

Subject Categories : Government and Political Science
      Seismology
      Seismic Detection and Detectors
      Nuclear Weapons

Distribution Statement : APPROVED FOR PUBLIC RELEASE