|Information from the CISN
|Date & Time (Local):
04:02:17 PM (PDT)
|Date & Time (UTC):
||23 miles SE of Bodie, CA
Today a M4.7 earthquake occurred in the area of the Adobe Hills at 08:45 PM. It was
followed by numerous aftershocks, include events of M3.5, 3.0, 3.3, and 3.0. In contrast
to the events of September, these earthquakes appear to be a north to northwest trending
The Nevada Bureau of Mines and Geology
reported today the discovery of minor cracks related to fault movement during
the swarm. According to NBMG, "Three groups of cracks were found over
an 800 m distance. Two groups were on a fault with very subtle
surface expression, and the easternmost group occurred along a very
prominent strike-slip fault. The cracks are minor, commonly opened only 2
to 5 mm wide, but are significant because they align along faults, are
unique in the area canvassed, and show tectonic patterns. Several of the
cracks have right-stepping patterns and a couple of cracks had shifted
left-laterally by as much as 3 mm"
September 20: An M4.8 occurred this morning at 9:51 AM local time. Over 600
events have occurred in this swarm as of noon today.
Scientific background on this swarm and
maps of background seismicity are now available.
September 18: An earthquake sequence is occurring near the California/Nevada border,
just east of Mono Lake and beneath the Adobe Hills. This series of events started on 9/18 at
12:02 local time with an M2.3 earthquake. It was followed by an
M4.1 (12:08 AM), the 5.5 at (04:02 PM - this event), a 5.4 (04:43 PM),
and a 4.1 (04:47 PM) as well as numerous events less than M4.
- Ground Motions
The CISN Northern California Management Center produces
for events of M3.5 and higher. ShakeMaps are based on the observed ground motions from
seismic instruments combined with predicted motions in areas without sensors. In this swarm
ShakeMaps have been produced for several events - only the largest events are listed here.
The CISN Engineering Data Center
produces reports showing details of
ground motions for events of interest. Thus far, they have generated
two Internet Quick Reports (IQR) for events in the swarm:
Many earthquakes in this swarm have been widely felt. People with Internet access
can report their observations of shaking and damage through the
Did You Feel It?
Web site. In the links below, you can see the maps illustrating the reported
intensities for several events in this sequence. Unlike the ShakeMaps - which
are based on data from seismic instruments - these maps are based on human
observations. You can contribute to these data by filling out the form for each event.
These links will take you to seismocams showing current earthquake activity.
Below are links to waveforms for the M5.5 and 5.4 events.
- Related Links
CISN Northern California Management Center and the Nevada Seismological Laboratory