by M. Kikuchi & Y. Yamanaka

(EIC: Earthquake Information Center)

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Bonin Is. earthquake of Aug. 20, 98 (Mj7.1)

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1. Basic Information

    Origin-time   Epicenter  Depth  Magnitude

2. Data processing

3. Result
  Results are shown in Figure 1 Main source parameters:

   (strike, dip, slip) = (343, 76, -40)
  Seismic moment  Mo = 5.2 e19 Nm  (Mw = 7.1)
  Source duration (rupture propagation + rise time) T = 11 s
  Depth of the initial break  H = ? km
  Fault area   S = ? x ? km^2
  Dislocation  D = Mo /mu S = ? m (mu = ? GPa)
  Stress drop  DELTA sigma = 2.5 Mo/ S^1.5 = ? MPa

4. Interpretation and comments

***** Sorry, still incomplete *****