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Update : ER does not expect serious damage from this earthquake
1km (1mi) WNW of View Park-Windsor Hills, California
1km (1mi) ESE of Baldwin Hills, California
4km (2mi) SE of Culver City, California
5km (3mi) NNW of Inglewood, California
12km (7mi) WSW of Los Angeles, California
86km (53mi) ESE of Ventura, California
Most important Earthquake Data:
Magnitude : 3.8
Local Time (conversion only below land) : 2015-05-03 04:07:18
Earthquake close to Ridgecrest, Southern California
Last update: October 6, 2014 at 12:41 pm by By Armand Vervaeck
Update : A light shaking is expected to be felt in Ridgecrest.
14km (9mi) ENE of Ridgecrest, California
73km (45mi) NE of California City, California
96km (60mi) NNW of Barstow, California
98km (61mi) NNW of Barstow Heights, California
435km (270mi) SSE of Carson City, Nevada
Most important Earthquake Data:
Magnitude : 3.7
Local Time (conversion only below land) : 2014-10-06 04:35:21
Extremely dangerous earthquake close to the Napa Valley, California – no official report of injuries so far but a lot of damage
Last update: August 24, 2014 at 2:09 pm by By Armand Vervaeck
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Update 13:57 UTC : A typical strike-slip earthquake with a mainly horizontal movement OR in otrher words the most dangerous earthquake type in the world. Still no official reports about injured people. A lot of rumours though.
Update 13:27 UTC : Damage we can expect at a place like Napa Valley. What a terrible waste of energy for the wine makers. Hopefulkly they are well insured
Update 13:24 UTC : No official reports of injuries so far (let’s call this a miracle)
Update 13:18 UTC : 68,742 customers still without power across California; majority affected are in Napa and Sonoma counties
Update 13:13 UTC : Significant damage to downtown Napa, ordering rescue teams, people trapped in homes
The Napa City council reports that some streets in downtown Napa, Calif., are being closed following major damage to buildings
Update 11:45 UTC : Twitter user Mike Smith just wrote : Listening to a Napa County scanner stream. Sounds like a lot of injuries and damage in the Napa/Sonoma area.
Update 11:38 UTC : A building partly collapsed in Napa (see image below). ER fears that there are more cases like this one. Hard to say how many people might be injured but we are sure that there wil be people injured during this quake. Recent houses will be OK but alder not-refitted houses might be of risk.
Update 11:29 UTC : California Highway Patrol checking crossings and bridges for obvious signs of structural integrity after quake. For our readers from elsewhere in the world : The earthquake happened in the middle of the night and rescue services have to operate in the dark. millions of people have been awakened from the shaking of this earthquake
Update 11:23 UTC : There is a population of 280000 people in a radius of 20 km around the epicenter. Power outages are reported in North Bay area of San Francisco as well as Sonoma, Napa counties
Update 11:13 UTC : Until now much reports of shaken interiors from Napa and the Napa valley area
Update 11:08 UTC : People in Napa Valley are frightened and call it the biggest ever. The image below is from a house in Napa. San Francisco no reports of damage so far.
Ar ER we call a radius of 10 km around the epicenter as extremely dangerous and a radius of 30 km as dangerous for damage/injuries
Update 11:01 UTC : ER calls this earthquake extremely dangerous for serious damage and even injuries.
Update 10:59 UTC : We apologise for not being able to serve all our readers as the servers can only serve a limited number of people (thousands at a time) but demand is simply too high to cope
6km (4mi) NW of American Canyon, California
9km (6mi) SSW of Napa, California
13km (8mi) NNW of Vallejo, California
14km (9mi) SE of Sonoma, California
82km (51mi) WSW of Sacramento, California
Most important Earthquake Data:
Magnitude : 6
Local Time (conversion only below land) : 2014-08-24 03:20:44
Strong earthquake in an merely unpopulated are in northern California
Last update: May 24, 2013 at 8:19 am by By Ashish Khanal
A couple of aftershocks up to M 4.9 occured. There are so far no reports of any structural damage.
The populated areas Greenville, Westwood and Chester (5000 inhabitants in total) may have felt a MMI V moderate shaking.
39000 people may have felt a light shaking.
Shaking map of the epicenter are
9000 people may have felt a moderate shaking based on USGS experience reports, this means that this earthquake can be labeled “harmless” for serious damage and injuries.
The many I Have Felt It reports which can be read in this site are confirming the USGS numbers.
11km (7mi) WNW of Greenville, California
43km (27mi) SW of Susanville, California
60km (37mi) NE of Magalia, California
67km (42mi) NE of Paradise, California
159km (99mi) NW of Carson City, Nevada
Most important Earthquake Data:
Magnitude : 5.7
Local Time (conversion only below land) : 2013-05-23 20:47:07
Moderate earthquake close to Cobb Mountain and The Geysers geothermal project, Northern California
Last update: March 14, 2013 at 6:22 pm by By Ashish Khanal
Preliminary Magnitude M4.6 at a shallow depth of 2 km.
The epicenter area is mainly a wilderness area, with only some isolated houses.
We do not expect any damage because of the relatively big distance to the nearest villages (considering the Magnitude).
This area has no historic record (since 1900) of a major earthquake.
Cobb (2000 inhabitants) is expected to have experienced a light shaking and Cloverdale (9000 inhabitants) a weak shaking. Other locations in the area a very weak shaking, probably only felt by a very limited number of people.
Santa Rosa : a (theoretically) “not to be felt” shaking
5km (3mi) WSW of Cobb, California
21km (13mi) SW of Clearlake, California
23km (14mi) NNE of Healdsburg, California
29km (18mi) N of Windsor, California
115km (71mi) WNW of Sacramento, California
Most important Earthquake Data:
Magnitude : 4.2
Local Time (conversion only below land) : 2013-03-14 02:09:00
GMT/UTC Time : 2013-03-14 09:09:00
Depth (Hypocenter) : 4 km
Update 18:20 UTC : We have pulled the following “I Have Felt It” report out of the many we received as it came from the epicenter area itself :
March 14, 2013 I awoke to the worst shaking and rumbling I have felt in the 8 and half years that I have been living in Cobb California. I am used to the shaking but this was different. For the first time I wondered if I should get out of the house. There was a second shaking 5 to 10 seconds later and rumbling in the distance for 30 seconds more.
Update 11:41 UTC : It looks like this earthquake has some links with the geothermal project at the nearby The Geysers. The extremely shallow location of the hypocenter (2 km) is another indication of this theory.
Read carefully the text of The Geysers below as we might have set a record today.
The Geysers The Geysers is a complex of 22 geothermal power plants, drawing steam from more than 350 wells, located in the Mayacamas Mountains 72 mi (116 km) north of San Francisco, California. The largest in the world, the Geysers has 1517 MW[1] of active installed capacity with an average production factor of 63% (955 MW).Calpine Corporation operates and owns 19 of the 22 active plants in the Geysers and is currently the United States’ largest producer of geothermal energy. Two other plants are owned jointly by the Northern California Power Agency and the City of Santa Clara’s municipal Electric Utility(now called Silicon Valley Power). The Bottle Rock Power plant owned by the US Renewables Group was expected to be reopened in 2007. Another plant is under development by Ram Power Corp, formerly Western Geopower, with operation set to begin in 2010. Since the activities of one geothermal plant affects those nearby, the consolidation of plant ownership at The Geysers has been beneficial because the plants operate cooperatively instead of in their own short-term interest.
Seismicity at The Geysers
Current studies of The Geysers Geothermal Field seismicity have reached the conclusion that deep-well injection in the field produces mostly microseismic events between magnitude 0.5-3.0 on the Richter Scale (M).
Worldwide, the largest induced seismic event to date linked to Enhanced Geothermal System (EGS) activity was M3.7 in the Cooper Basin of Australia. However, research based on maximum fault lengths indicates that a M5.0 is the largest possible (but not probable) event in the Geysers. A concern to the residents is not only the amount of seismicity but the magnitude of the largest seismic event likely to occur. Although no one can accurately predict earthquakes, the magnitude of an earthquake is dependent on the surface area that can slip — the length times the depth or width of the fault. Therefore, a large earthquake can occur only on a large fault. There are no mapped faults of large length in The Geysers, so it is extremely unlikely that induced seismicity caused by activities in The Geysers will lead to a large earthquake.
Future
The Geysers electrical plant reached peak production in 1987, at that time serving 1.8 million people. Since then, the steam field has been in gradual decline as its underground water source decreases. Currently, the Geysers produce enough electricity for 1.1 million people.
Techniques developed from Enhanced Geothermal Systems research will increase the production of the region in the future. By reinjecting greywater from the nearby city of Santa Rosa, existing wells will be recharged. This water will be naturally heated in the geothermal reservoir, and be captured by the existing power plants as steam. The project should increase electrical output by 85 MW, enough for about 85,000 homes. (source Wikipedia)
One of The Geysers geothermal plants – Image courtesy Wikipedia
Update 09:36 UTC : Contrary to what we wrote below, this quake may have been felt a little stronger than expected as we received a readers experience from Santa Rosa, stating : “i was watching tv and i felt everything slightly moving. It was a surprise for me”
Exceptionally strong shallow earthquake along the border of Nevada and California
Last update: February 13, 2013 at 9:12 am by By Ashish Khanal
Update 09:12 UTC : Earthquakes and (expected) shaking intensities are not an exact science as you can see by comparing both images below. The population exposure is the theoretical map of the intensities as expected by USGS. Mammoth Lakes and Bishop are just falling in the MMI II radius (very weak shaking), which should have been hardly felt in these towns. But … people have felt this earthquake in a far wider radius (map just below this paragraph). Such maps are mainly an indication on what to expect in general. Do not blame USGS to be erroneous, because seismology (including intensities) is a very complicated matter. Earthquake waves are propagated through many layers in the earth and each layer can have a different propagation structure. We can assure you, USGS does great work in getting as close as possible to the reality and their work and accuracy are improving year after year.
Update 08:47 UTC : Since the mainshock we have counted 8 M3+ aftershocks. Aftershocks are normal and some faulting areas are very sensitive to aftershocks like this one.
– 28000 people will have experienced this as a weak earthquake. These are theoretical intensity values. As one can see below in our I Have Felt It reports, this earthquake was perceived by people at a far greater distance than the USGS did expect.
Exceptionally strong earthquake in a luckily sparsely populated area.
The maximum shaking intensity as calculated by the USGS was a weak to very weak shaking (MMI II or III).
The area has however a number of cattle barns in a radius of 10 to 20 miles from the epicenter and it cannot be excluded that these may have been damaged.
The epicenter area has NO volcanic past but influencing the seismic pattern of the nearby Mammoth Mountain volcanic field cannot be excluded.
Most important Earthquake Data:
Magnitude : 5.1
Local Time (conversion only below land) : 2013-02-12 16:10:13
