Dynamic Features and Identification of Regional Seismic Signals From Dead Sea Calibration Shots
Abstract
Three large-scale underwater chemical explosions were conducted on November 8-11, 1999 in the Dead Sea. One of the main objectives of the experiment was to provide data for source characterization to improve the IMS detection, location and discrimination capabilities. The explosions were recorded by the Israel Seismic Network (ISN) including 23 short-period (SP) stations, two auxiliary IMS broadband (BB) stations MRNI and EIL, BB station JER, and three temporary BB stations deployed at sites of the planned Israeli CNF stations. The magnitude values, determined from SP recordings, fit well the empirical relationship obtained from previous explosions: M(L) = 0.285 + log(10)W(kg), confirming a high seismic efficiency of the shots. The efficiency was also estimated by determination of energy of seismic waves recorded at local seismic stations relative to the explosives energy. A clear spectral modulation, caused by the bubble pulsation effect, is observed in all SP and BB seismograms. The bubble periods, determined from the harmonic series on smoothed spectra of ISN seismograms, are in good agreement with the modified Willis' (1963) empirical equation: T(b) = 2.1*W(1/3)/(P(0) + d*)(5/6), where P(0) is the pressure at the sea level (10.778 m of water column), the shot depth d=70 m, water density = 1.236g/cm(3).
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 2000
- Accession Number
- ADA516260
Entities
People
- Rami Hofstetter
- Yefim Gitterman