This map shows the predicted (theoretical) travel times, in minutes, of the compressional (P) wave from the earthquake location to points around the globe. The travel times are computed using the spherically-symmetric IASP91 reference earth velocity model. The heavy black lines shown are the approximate distances to the P-wave shadow zone (103 to 120 degrees).
99/09/20 17:47:19 23.78N 121.09E 33.0 7.6Ms
The following is a release by the United States Geological Survey, National Earthquake Information Center: A major earthquake occurred about 35 miles (50 km) west southwest of Hua-lien, Taiwan or about 90 miles (150 km) south southwest of Taipei, Taiwan at 11:47 AM MDT, Sep 20, 1999 (Sep 21 at 1:47 AM local time in Taiwan). A PRELIMINARY MAGNITUDE OF 7.6 WAS COMPUTED FOR THIS EARTHQUAKE. The magnitude and location may change slightly as additional data are received from other seismograph stations. No reports of damage or casualties have been received at this time; however, this earthquake may have caused substantial damage and casualties due to its location and size.
National Earthquake Information Center