Earthquake overview : At 5 AM in the night on August 24 2011, an earthquake measuring 4.2 magnitude struck the greater Mammoth Lakes area.
We ask people who have felt this earthquake to share their information with our many readers (also from your area). Please use the "I Have Felt it" form below.
Based on the theoretical values of USGS 6 people would experience a moderate shaking, 9,000 people a light shaking and 59,000 people a weak shaking.
The "Felt" area was more or less along the high sierra and extending from the southeast to the northwest.
The earthquake was also felt in Yosemite National Park ans some people even felt it as far as Carson City, Fresno and Lone Pine.
As you can see on the USGS graphic at right, the present epicenter location is among the most active and vulnerable in the sierra.
After checking our many sources, we could not detect any damage or injuries.
In May 1980, the same area (epicenters from within a radius of 5-10 miles) was hit by 4 separate earthquakes ranging from 6.0 to 6.2. 3 of them occurred at May 25 and 1 at May 27.
Let us hope that this sequence will not come back again.
This is the list of the different shocks :
M 6.2, May 27, 1980 14:50:56 UTC - Depth: 16.09 km (10.00 mi)
M 6.1, May 25, 1980 19:44:50 UTC - Depth: 14.20 km (8.82 mi)
M 6.1, May 25, 1980 16:33:44 UTC - Depth: 9.01 km (5.60 mi)
M 6.0, May 25, 1980 16:49:27 UTC - Depth: 8.67 km (5.39 mi)
"I Have Felt It" reports as received by Earthquake-Report.com
MMI values (if indicated) after the text (III: Weak shaking, IV Light shaking, V Moderate shaking, VI Strong shaking, VII Very Strong shaking)
East Sonora Califoria - 5am 8/24/11 I was sitting in my tiny livingroom. Walls started shaking, Pictures on wall slipped back and forth. Kitchen cabnets shook. Hanging coffee cups swung back and forth. Am I the only one who felt this? I came here 11 years ago from the Bay Area. I lived through the Loma Pre eta quake. I did not know that Sonora got earth quakes. First one I've felt here. Yvonne Kennedy - MMI V
Yosemite, CA - We are on vacation in Yosemite and everyone thought it was a bear we all woke up and determined it was an earthquake. It was a 4.2 in Yosemite and a 4.5 in the epicenter at mammoth lakes - MMI V
Gull lake, CA - quick shake as if someone was started while sleeping. I was sleeping in a popup trailer along gull lake. take care - MMI V
Most important Earthquake Data:
Magnitude : 4.2
UTC Time : Wednesday, August 24, 2011 at 11:59:51 UTC
Local time at epicenter : Wednesday, August 24, 2011 at 04:59:51 AM at epicenter
Depth (Hypocenter) : 10 km
14 km (9 miles) SE (137°) from Mammoth Lakes, CA
17 km (11 miles) W (264°) from Toms Place, CA
28 km (18 miles) WNW (301°) from Round Valley, CA
Approx. 50 km from Yosemite NP village
254 km (158 miles) ESE (115°) from Sacramento, CA
Links to important maps
Did You Feel It Map
Google satellite map of the area showing the kind of terrain the earthquake took place
3-dimensional view of the earthquake area (USGS epicenter location)
USGS historic earthquakes map
USGS Seismic hazard map
QuakeSOS+ and QuakeSOS free are iPhone applications developed by Armand Vervaeck, the founder of Earthquake Report. The Application simplifies immediate group communication to friends and family members (with your exact GPS location) and is feeding the users with Earthquake Report news. The 0.99 US$ QuakeSOS+ version will support the activities of SOS Earthquakes.
Earthquake-Report.com headlines on twitter
@OnlyQuakeNews : Get all the headlines of our earthquake-report.com articles + regular updates on ongoing events
@QuakeSOS : earthquake-report.com news + automatic earthquake notifications of USGS earthquakes of M 4.0 or higher with emphasis to earthquakes in the America's and the Pacific Ocean sphere (4 and up) and a lot of the rest of the world (5 and up). This account was created for our QuakeSOS and QuakeSOS+ iPhone applications
@ShakingEarth : earthquake-report.com news + automatic earthquake notifications of EMSC earthquakes of M 4.0 or higher with emphasis to earthquakes in European and Asian / Middle East sphere (4 and up) and a lot of the rest of the world (5 and up). This account was originally created to stimulate our Facebook account
@QuakeMaps : earthquake-report.com news with mapping notifications of ALL earthquakes M 3.0 and higher from all over the world via EMSC and USGS. This account was created for our http://www.quake-maps.com website
I did feel it – Ik heb het gevoeld – Το έκανα αισθάνεται – Yo lo siento – 我的确感到了 – 私はそれを感じていました- Ich habe es gefühlt – Bunu hissediyorum yaptı – لم أشعر أنه