Basic Information

Time of Occurrence (GMT): Wednesday May 15, 2002 at 17:54:48.58 Z Time of Occurrence (PDT): Wednesday May 15, 2002 at 10:54:48.58 AM Time of Occurrence (PST): Wednesday May 15, 2002 at 09:54:48.58 AM Depth (km) 8.45 Magnitude (Mc) 4.3 Location 42.2287N 121.9032W 10.1 km W of Klamath Falls, OR 42.1 km SE of Mt McLoughlin, OR 372.0 km S of Portland, OR Name of data file: 02051517544k 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. Visit the WEBICORDERS to see near-real-time earthquake trace data.

• Community Internet Intensity Map: Human Reports of Experienced Shaking Intensity - By Zip Code
• DID YOU FEEL IT? Fill out a Earthquake Form
• Shake Map: Instrumental Measurements of Shaking Intensity

Detailed Information and Graphics about the Earthquake

Our data base of earthquake hypocenters contains information from the 19th century to the present. Included are:

• A map of the Pacific Northwest showing the location of the mainshock (in red) plus prior earthquakes M > 3.0. Shallow events are black. Events deeper than 35 km are green.
• A map showing a closer view of the earthquake and prior historical earthquakes with magnitude 3.0 or greater. Shallow events are black. Events deeper than 35 km are green.
• A list of 10 big earthquakes preceding the mainshock that are closest to it and have a magnitude greater than 4.0. These are the most significant historical earthquakes in the vicinity of the mainshock (see closer view map above).
• A map showing the location of the mainshock relative to cities.
• A map showing the location of the mainshock relative to the nearest seismograph stations that recorded it.
• A general map of significant historical earthquake locations in the Pacific Northwest.
• A detailed list of all earthquakes (M > 1.0) that occurred in the two years prior to the mainshock in the area shown on the next map
• A map of all earthquakes (M > 1.0) that occurred in the two years prior to the mainshock. Detailed area shown is just few kilometers around the mainshock.
• A List of the nearest 20 strong motion sites

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

• A diagram and table of the P-wave fault plane solution.

Preliminary Strong Motion Information

• Strong-motion information from digital accelerographs.

Related Information: Most Up-to-Date Local, National, and Global Earthquake Summaries

• Catalog and Map of Pacific Northwest earthquakes, Mag>2 from the PNSN
• Catalog and Map of United States earthquakes, from the ANSS
• Catalog and Map of world earthquakes, from the IRIS