Historic Earthquakes

Magnitude 7.5 OAXACA, MEXICO
1999 September 30 16:31:15 UTC

Theoretical P-wave Travel Times

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 140 degrees).

Theoretical P-Wave Travel Times
City Distance
(degrees)
Travel Time
(min:secs)
Arrival Time
UTC
Phase
Mexico City, Mexico 3.97 0:58.3 16:32:13.3 Pn
Brownsville, Texas 9.81 2:18.3 16:33:33.3 Pn
Miami, Florida 18.37 4:09.7 16:35:24.7 P
Albuquerque, New Mexico 20.85 4:36.7 16:35:51.7 P
Wichita, Kansas 21.63 4:45.1 16:36:00.1 P
Knoxville, Tennessee 22.42 4:53.5 16:36:08.5 P
St. Louis, Missouri 23.28 5:02.4 16:36:17.4 P
Golden, Colorado 24.69 5:15.2 16:36:30.2 P
Los Angeles, California 26.25 5:29.3 16:36:44.3 P
Washington, D.C. 28.67 5:51.0 16:37:06.0 P
San Juan, Puerto Rico 29.49 5:58.3 16:37:13.3 P
Philadelphia, Pennsylvania 30.44 6:06.6 16:37:21.6 P
Duluth, Minnesota 30.86 6:10.4 16:37:25.4 P
San Francisco, California 31.20 6:13.3 16:37:28.3 P
New York, New York 31.60 6:16.9 16:37:31.9 P
Lima, Peru 34.19 6:39.4 16:37:54.4 P
Ottawa, Canada 34.27 6:40.1 16:37:55.1 P
Boston, Massachusetts 34.31 6:40.4 16:37:55.4 P
Bangor, Maine 37.21 7:05.2 16:38:20.2 P
Seattle, Washington 37.95 7:11.5 16:38:26.5 P
Honolulu, Hawaii 57.64 9:43.8 16:40:58.8 P
Anchorage, Alaska 58.62 9:50.6 16:41:05.6 P
London, England 81.74 12:12.0 16:43:27.0 P
Bergen, Norway 82.13 12:14.0 16:43:29.0 P
Palmer Station, Antarctica 86.95 12:38.3 16:43:53.4 P
Rome, Italy 93.22 13:07.6 16:44:22.6 P
Moscow, Russia 98.94 13:33.4 16:44:48.4 Pdiff
Wellington, New Zealand 99.14 13:34.3 16:44:49.3 Pdiff
Tokyo, Japan 105.70 14:03.4 16:45:18.4 Pdiff
Agana, Guam 112.35 14:32.9 16:45:47.9 Pdiff
Brisbane, Australia 114.79 14:43.8 16:45:58.8 Pdiff
Beijing, China 116.24 14:50.2 16:46:05.2 Pdiff
Nairobi, Kenya 132.14 16:00.8 16:47:15.8 Pdiff
Kathmandu, Nepal 136.46 16:20.0 16:47:35.0 Pdiff