Historic Earthquakes

Magnitude 7.2 Near Coast of Ecuador
1998 August 04 18:59:20 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
Lima, Peru 11.90 2:47.419:02:07.4Pn
San Juan, Puerto Rico 23.57 5:07.719:04:27.7P
Miami, Florida 26.20 5:31.619:04:51.6P
Mexico City, Mexico 27.10 5:39.719:04:59.7P
Brownsville, Texas 31.09 6:15.119:05:35.1P
Knoxville, Tennessee 36.62 7:03.019:06:23.0P
Washington, D.C. 39.41 7:26.519:06:46.5P
St. Louis, Missouri 40.10 7:32.319:06:52.3P
Philadelphia, Pennsylvania 40.63 7:36.619:06:56.6P
Wichita, Kansas 41.25 7:41.719:07:01.7P
New York, New York 41.51 7:43.919:07:03.9P
Albuquerque, New Mexico 43.13 7:57.119:07:17.1P
Boston, Massachusetts 43.54 8:00.419:07:20.4P
Ottawa, Canada 45.99 8:19.919:07:39.9P
Golden, Colorado 46.11 8:20.819:07:40.8P
Bangor, Maine 46.36 8:22.819:07:42.8P
Duluth, Minnesota 48.26 8:37.619:07:57.6P
Los Angeles, California 49.47 8:46.919:08:06.9P
San Francisco, California 54.38 9:23.519:08:43.5P
Seattle, Washington 60.3910:05.919:09:25.9P
Palmer Station, Antarctica 68.0010:55.919:10:15.9P
Honolulu, Hawaii 78.5211:58.019:11:18.0P
Anchorage, Alaska 80.7712:10.119:11:30.1P
London, England 84.3712:28.919:11:48.9P
Bergen, Norway 88.3812:48.519:12:08.5P
Rome, Italy 92.5513:07.919:12:27.9P
Wellington, New Zealand 100.7313:44.719:13:04.7Pdiff
Moscow, Russia 105.9414:07.919:13:27.9Pdiff
Nairobi, Kenya 117.2014:57.819:14:17.8Pdiff
Brisbane, Australia 121.6715:17.719:14:37.7Pdiff
Tokyo, Japan 128.9315:49.919:15:09.9Pdiff
Agana, Guam 133.5216:10.319:15:30.3Pdiff
Beijing, China 137.9616:30.019:15:50.0Pdiff
Kathmandu, Nepal 149.7619:41.019:19:01.0PKPdf