ERI, Univ. of Tokyo, JAPAN
     EIC Seismological Note  No. 68          Oct. 1. 99
Preliminary Results of Teleseismic Body Wave Analysis
 Source Rupture Process of the Mexico earthquake
                of September 30, 1999
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< QED Information >
QED (quick epicenter determination) information due to USGS is:

Origin Time  16:31:13, Sep. 30, 1999 (UT)
Epicenter    16.1N, 96.70W

< Data and Analysis >
   Vertical components of P-wave data at IRIS stations were
retrieved and converted into ground displacement. We inverted 
the teleseismic data into a series of subevents using Kikuchi 
and Kanamori (1991)'s method.  

< Results >
   The results are shown in Fig. 1.  Main source parameters derived
are as follows:

   Centroid depth H = 55 km
   (strike, dip, slip) = (119, 37, -97)/(307, 54, -85) 
   Seismic moment  Mo = 1.2 x10**20 Nm (Mw = 7.3)
   Source duration T = 14 s
                                        (M. Kikuchi and Y. Yamanaka)