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Earthquake Hazards Program


Saturday, December 20, 2008 at 10:29:23 UTC

Theoretical P-Wave Travel Times

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
Travel Time
Arrival Time
Tokyo, Japan 2.31 0:38.110:30:00.1Pn
Beijing, China 20.60 4:39.310:34:01.3P
Agana, Guam 23.13 5:06.310:34:28.3P
Anchorage, Alaska 48.17 8:40.210:38:02.2P
Kathmandu, Nepal 48.50 8:42.810:38:04.8P
Honolulu, Hawaii 53.71 9:22.010:38:44.0P
Brisbane, Australia 64.5310:37.110:39:59.1P
Seattle, Washington 67.1710:54.110:40:16.1P
Moscow, Russia 68.0110:59.410:40:21.4P
San Francisco, California 72.3011:25.810:40:47.8P
Bergen, Norway 77.1411:53.810:41:15.8P
Los Angeles, California 77.1911:54.110:41:16.1P
Phoenix, Arizona 81.6612:18.410:41:40.4P
Golden, Colorado 81.8912:19.610:41:41.6P
Wellington, New Zealand 83.0012:25.410:41:47.4P
Duluth, Minnesota 83.7012:29.010:41:51.0P
Albuquerque, New Mexico 84.0912:31.010:41:53.0P
London, England 86.3312:42.210:42:04.2P
Wichita, Kansas 87.7012:48.910:42:10.9P
Rome, Italy 89.4512:57.110:42:19.1P
St. Louis, Missouri 90.7613:03.210:42:25.2P
Ottawa, Canada 91.4313:06.310:42:28.3P
Bangor, Maine 94.2313:19.210:42:41.2P
Knoxville, Tennessee 95.4013:24.510:42:46.5P
Boston, Massachusetts 95.7313:26.010:42:48.0P
Brownsville, Texas 96.0913:27.710:42:49.7P
New York, New York 96.1413:27.910:42:49.9P
Philadephia, Pennsylvania 96.3813:28.910:42:50.9P
Washington, D.C. 96.5613:29.810:42:51.8P
Mexico City, Mexico 99.5613:43.110:43:05.1Pdiff
Nairobi, Kenya 103.2113:59.410:43:21.4Pdiff
Miami, Florida 106.1514:12.410:43:34.4Pdiff
San Juan, Puerto Rico 118.9615:09.310:44:31.3Pdiff
Lima, Peru 137.0316:29.510:45:51.5Pdiff
Palmer Station, Antarctica 145.4119:37.210:48:59.2PKPbc

Travel Time Information and Calculator

Preliminary Earthquake Report
U.S. Geological Survey, National Earthquake Information Center
World Data Center for Seismology, Denver

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