Special Event
Basic Information
Time of Occurrence (GMT): Wednesday April 28, 1999 at 08:06:16.04 Z
Time of Occurrence (PDT): Wednesday April 28, 1999 at 01:06:16.04 AM
Time of Occurrence (PST): Wednesday April 28, 1999 at 00:06:16.04 AM
Depth (km) 24.01
Magnitude (Mc) 3.8
Location 43.1707N 120.3822W
92.3 km SE of Newberry Caldera, Oregon
123.8 km SE of Bend, OR
317.7 km SE of Portland, OR
This earthquake is located in the southeast corner of the Christmas Lake
Valley, Oregon
Name of data file: 99042808061o
This is an automated web page produced after a
significant earthquake to give essential information about the
earthquake, its aftershocks, and previous earthquake activity
in the region. Some of the information here will be
updated as aftershocks occur.
Detailed Information and Graphics about the Earthquake
Our data base of earthquake hypocenters contains information
from the 19th century to the present.
Included are:
Foreshocks and Aftershocks
The following information will be updated as new aftershocks occur.
Included are:
- An Earthquake Catalog listing the location and magnitude of all earthquakes we have located in the epicentral region (including the mainshock and any aftershocks) for the current year.
- Detailed Map of the earthquakes in this catalog for the epicentral region.
- Seismic Activity as a function of time in the epicentral region since the time of the mainshock.
Earthquake Mechanism
If sufficient P-wave first motion data are available,
a fault plane determination for the earthquake
will be available in the form of
Moment Tensor Estimates of the Earthquake size may also be available. To see,
check at Oregon State U.
Preliminary Strong Motion Information
Related Information: Most Up-to-Date Local, National, and Global Earthquake Summaries