Significant Quake Strikes Near SLC, UTAH

SEISMIC HAZARD
HEIGHTENED GLOBAL SEISMICITY
SCENARIOS 08, 07
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Earthquake Strikes in the Intermountain Seismic Belt (ISB)

Centered at 40.891°N, 111.683°W the quake struck at a depth of about 11.9km.

EQ Location Map

Source: USGS/EHP

EQ Details

Magnitude: 3.3Mw
Event Time: 2014-06-12 04:34:04 UTC
Location: 40.891°N 111.683°W depth=11.9km (7.4mi)
Nearby Cities:

• 16km (10mi) E of Centerville, Utah
• 16km (10mi) E of Bountiful, Utah
• 19km (12mi) ESE of Farmington, Utah
• 19km (12mi) ENE of North Salt Lake, Utah
• 22km (14mi) NE of Salt Lake City, Utah

UTAH – Earthquake History – USGS/EHP

On March 12, 1934, at 8:06 a.m., an earthquake of intensity VIII originating near Kosmo, on the north shore of Great Salt Lake, affected an area of about 440,000 square kilometers, including much of northern Utah and parts of Idaho, Montana, Nevada, and Wyoming. This tremor, which measured magnitude 6.6, could have caused great damage in a densely populated area. Because of the sparse settlement in the region there was very little damage – mostly demolished chimneys and cracked walls in poorly constructed buildings. Two deaths, however, were attributed to the shock. The outstanding feature of the earthquake, related to the Hansel Valley fault, was the emission of large quantities of water from fissures and craterlets. Considerable faulting occurred in the epicentral region. Precise leveling revealed that areas sank to depths up to 390 millimeters. The onset of the shock was abrupt. There were no foreshocks, but aftershocks continued for 2 days; only one, at 11:20 a.m. on the same day, was outstanding (magnitude 6.0). There was moderate damage over a broad area, including Salt Lake City, where plaster fell. All chimneys fell in Kosmo and Monument; fissures, holes, cracks, and springs appeared in connection with a belt of fractures at least 8 kilometers long. The second shock was slightly less severe than the main tremor. Intensities for the aftershock are very unreliable because many observers tried to describe both earthquakes in a single report. Another strong aftershock (magnitude 5.5) affected an area of about 45,000 square kilometers in northern Utah and southern Idaho on May 6. It was reported to be strongest in Salt Lake City and Preston, Idaho, where the intensity reached VI.

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IMPORTANT NOTICE: FIRE-EARTH EQ Forecast

The next detailed FIRE-EARTH Earthquake Forecast will be released together with Bulletin NO. 106  on June 14, 2014.

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