Strong earthquake in the Borrego range near Anza, Southern California

Update March 12, 09:59 UTC :  Tennis players Federer and Nadal had a scary experience yesterday together with nearly 7 million other people while playing a tournament at Indian Wells (approx. 30 km from the epicenter). Federer, a Swiss, was  not prepared for an earthquake although he visits many potential earthquake destinations around the word.
Based on press reports he did exactly what is NOT DONE in case of an earthquake, running away from his room while the shaking is going on. He might read our short article : Be Earthquake Prepared for the next earthquake he will witness.  Read this article about their experience.
This article is also a MUST READ for every person on this planet who visits as a tourist many potentially dangerous countries like : Mexico, Australia, New Zealand, China, Iran, Turkey, Italy, Unites States, Iceland, Chile, Costa Rica, etc. etc. etc.

Update 18:10 UTC :  The earthquake was on the San Jacinto Fault, the most active in Southern California, said Lucy Jones, USGS science adviser for risk reduction. Aftershocks are expected.

Screen Shot 2013-03-11 at 19.19.27

Update 18:01 UTC :  Based on theoretical calculations 393,000 people will have experienced a light shaking (MMI IV) and 6.5 million people a weak to very weak shaking. Nothing special for Southern California, but the main difference in this case is that it was felt in such a huge area.

Update 17:46 UTC :  On the picture below you have a view of the desert mountain range where the earthquake struck. Except for some wildlife nobody will be around.

Anza Borrego Desert Wilderness State Park where the epicenter is -  image courtesy and copyright West Coast Sharon

Anza Borrego Desert Wilderness State Park where the epicenter is - image courtesy and copyright West Coast Sharon

Update 17:39 UTC :  Many Californians may have the same problems than we have : impossible to enter the USGS site.  The I Have Felt It Reports below will give you at least a good overview of how the people have experienced this earthquake.

Update 17:37 UTC : does not expect serious damage or injuries as the maximum theoretical shaking has been set to IV MMI (light shaking). This is mainly because the epicenter is in rocky mountainous area. Earthquake waves are not propagated very well in such ground.

Screen Shot 2013-03-11 at 18.57.28

Update 17:33 UTC :  The earthquake was felt from Los Angeles down to Northern Mexico (ie Mexicali). This is definitely one of the stronger earthquakes in California since the last couple of years.

Update 17:23 UTC : As you can see on our bottom map, the area had some very big earthquakes in the past.

Update 17:23 UTC : We have the impression that we are not the only ones having trouble with our servers as some USGS maps cannot be reached neither.

Update 17:20 UTC : USGS has updated his report and mentions now a M4.7 Magnitude at a depth of 12 km. 8 seconds later another one with the same Magnitude, but this may be changed again later on.

We have a hard time to write as we have too many readers in the site at the moment. Our apologies for this.
A lot of aftershocks are currently reported.
Luckily the epicenter is in a wilderness area but the valley to the east is of big concern.

Screen Shot 2013-03-11 at 18.08.14


19km (12mi) ESE of Anza, California
23km (14mi) SW of La Quinta, California
25km (16mi) SSW of Palm Desert, California
26km (16mi) SSW of Rancho Mirage, California
409km (254mi) W of Phoenix, Arizona

Most important Earthquake Data:

Magnitude : 4.7

Local Time (conversion only below land) : 2013-03-11 09:55:50

GMT/UTC Time : 2013-03-11 16:55:50

Depth (Hypocenter)  : 12.1 km

Depth and Magnitude updates in the list below.

Share your earthquake experience (I Have Felt It) with our readers.
Click on the "I Felt It" button behind the corresponding earthquake. Your earthquake experience is not only important for science, but also for people in the area as well as our global readership.

SRC Location UTC Date/time M D INFO
USGS Southern California Mar 11 20:15 2.5 9 MAP I Felt It
USGS Southern California Mar 11 20:15 2.5 10 MAP I Felt It
USGS Southern California Mar 11 19:50 2.7 15 MAP I Felt It
USGS Southern California Mar 11 19:50 2.7 27 MAP I Felt It
USGS Southern California Mar 11 19:50 2.7 11 MAP I Felt It
USGS Southern California Mar 11 18:25 2.8 11 MAP I Felt It
USGS Southern California Mar 11 17:11 2.5 31 MAP I Felt It
USGS Southern California Mar 11 16:58 3.0 11 MAP I Felt It
USGS Southern California Mar 11 16:56 3.0 14 MAP I Felt It
EMSC Southern California Mar 11 16:56 4.6 45 MAP I Felt It
GEOFON Southern California Mar 11 16:56 5.0 10 MAP I Felt It
USGS Southern California Mar 11 16:56 4.7 13 MAP I Felt It
WCATWC 60 Miles Ne Of San Diego California Mar 11 16:56 5.2 1 MAP I Felt It
USGS Southern California Mar 11 16:55 4.7 12 MAP I Felt It INFO
  • Coachella CA - Just some slight shaking of the damage
  • Indio, CA - it only lasted about 3 seconds but it was shaking the walls in our house
  • National City, CA USA - We just felt a moderate oscillatory movement in our apartment today.
  • Brea, California - More like a rolling sensations only lasting 2 seconds
  • San Diego - Gently swaying
  • Hemet, ca - Felt a quick rumble & house movement
  • Lake Elsinore, CA - It was a rolling wave effect here.
  • San Diego - 20th floor swaying
  • Encinitas ca. - I felt minor movement as I was sitting on my couch. Plants swayed & l ceiling lamp pull-chains swayed.
  • 92592 - boom first
  • 92583 - Rolling earthquake
  • riverside, ca - building shook then felt a roll
  • Laguna Hills - weak rolling type
  • South Chino - Working on laptop, made the table shake and the house seemed to sway. Lasted about 10 seconds.
  • Palm Springs ca - at hotel..moderate shaking
  • orange - mild swaying no jolts no damage
  • Coronado, CA - It only lasted about 10 seconds.
  • Irvine - Very rolly feeling like a wave.
  • Corona CA - Long rumbling/not sharp
  • corona - moving in office
  • Poway, CA - Mild shaking, also had similar report from Wife in downtown San Diego - 25 miles south.
  • Anaheim hills - Very weak shake very quick
  • huntington park ca - Swaying
  • downtown 9th floor - slight rolling for a few seconds
  • Carlsbad - a jolt
  • Irvine, ca - Im on the 3rd floor @ work. It was shaking then rolling, shaking again & again rolling!!!!!
  • downotown little Italy col. salomon cdc - Felt little swaying
  • La Quinta - Felt like bus drove into house. It was loud.
  • Clairemont, CA - rocking and then swaying. Seems like it lasted a good 20 - 30 seconds
  • 92037 - Desk and floor shuddered
  • Chino, CA - warehouse type building where the city of Chino borders Chino Hills... felt a few good "roles"
  • Yucaipa, CA - It was very scare to feel the earthquake. But it didn't last very long.
  • Downtown Los Angeles - Light jolt and swaying on 42nd floor of Downtown Los Angeles high-rise office building (modern construction).
  • 29 Palms, Ca - House felt wavy for 3 - 4 seconds
  • Temecula , CA - Light shaking for 5 seconds followed by slight shake for 5 seconds. Was indoors at my desk and my mini blinds wand was swinging.
  • Encinitas, CA - it felt like a large animal jumped on the roof. very brief shaking
  • Fullerton, CA - Glass on wall vibrated and it felt like a sway or rocking
  • main side Camp Pendleton - I felt a rumble in my feet and heard a rumble in the walls.
  • Riverside - felt shaking on the first floor while watching tv
  • San Jacinto, CA - Noisy, then rolling
  • Murrieta CA - Was parked and felt car shaking
  • Scripps Ranch, San Diego - Heard roof creak
  • Compton - it woke me up at first i thought it was just me but no it felt like an earthquake.
  • Porta Vista Hotel 3rd floor - I felt a shake, then a rolling sensation like a wave.
  • - I'm in the second floor of my home and usually you can fell every movement. I move here three months ago and I was wondering how would it feel in case of an earthquak. Well today I felt it while I was in bed, the whole thing just shake. It was medium fast movements.
  • College Area,,San Diego - Windows shook, 3 shakes
  • Rancho Mirage - Noisy shaking lasted about 5 seconds
  • Cal Poly Pomona - Mild shaking. More like swaying side to side.
  • Whittier, ca - Felt like a roll side to side.
  • 92118 - Strong enough to keep my chandelier swinging for a few minutes!
  • Escondido - Felt like a mortar......not like a quake...
  • El Cajon, CA - It shook the cement walls at the office.. The computer monitors and desks shook... My co-work and I just looked at each other wondering if it was going to continue... but sadly it did not. TLC
  • Palm Springs, CA - I got up immediately went to a door frame. Shaking/rattling continued for ? 30 secs. at least.
  • La Mesa, CA - Everything on my walls were shaking.
  • San Diego - Heard it coming, rattled the house pretty good, nothing fell, several wall hangings are now off center, some small items wiggled a bit out of place.
  • La Quinta - moderate shaking - lasted several seconds
  • Los Alamitos, CA - Working on the computer and I started feeling back and forth shaking. Moved the blinds on the windows. only lasted a short time then stopped.
  • La Mirada - Light shaking and then rolls for about 10 seconds.
  • Vista, CA - Windows and cupboards shook, computer shimied.
  • Whittier, ca - Rolling motion
  • Lemon Grove, Ca - My large desk and all of the items on top of it clearly shook for ast least 6 seconds!
  • Encinitas - Moderate shaking for 10 seconds, then felt the roll. Made the house shake very strongly.
  • La Jolla - rolling. probably lasted 20 seconds.
  • Loma Linda, CA - Felt like and sounded like something fell on the house but the ground didn't shake too bad. Very loud.
  • Del Mar Heights - Swaying in my chair, heard the walls shake
  • 4669 murphy canyon rd, san diego, ca 921 - Brief 5 second shake not a jolt felt like a 4.9 quake
  • Eastlake Greens, Chula Vista, - Sitting at the computer at home. Felt light shaking. Short lived
  • EL CAJON - Windows and doors rattled,and ground shook.
  • Anaheim ca - Sitting down at the doctor and felt like I was on a swing
  • San Dimas - Mild but enough to feel the shake for about 3 seconds.
  • Temecula - I felt it shaking for a good 10 seconds.
  • 92127 - Felt shaking and could hear walls creaking and rattling.
  • Cherry Valley/Beaumont - It was a short "Snap" type of quake.....then about 5 seconds mellowed out.......
  • Palm Springs - Quick loud rumble followed by rapid vibrations. Windows rattled but chandelier didn't swing much.
  • Fullerton Ca - A shake and ten swaying for about 15 seconds
  • Long beach - felt like i was moving side to side wasnt bad
  • Clairemont (san diego), ca - Two distinct small wobbles while sitting in my chair. My wife walking around didn't notice it, when I mentioned it to her at the time.
  • San Marcos - It was a mild wave like feeling.
  • 92108 - on 2nd floor building. desk shook for about 10 seconds then was over.
  • Idyllwild Ca - House really shook....wondered if it was "the big one."
  • East San Diego - Felt like a wave went under my house, lasted just a few seconds, under 10 I'd say, glass doors shaking in my cabinets, man I hate earthquakes!!
  • Escondido - Just laying on the couch when everything got all shaky, shaky, shaky
  • Anaheim, CA 92802 - Week shaking and swaying, wife couldn't feel it.
  • Omni Hotel, San Diego - I was on the 14th floor of the hotel and felt the building shaking for a few seconds.
  • Carlsbad, CA - Rolling sensation on upper floor of home
  • La Quinta - At my desk on 2nd floor and it shook quite badly for about 15-20 seconds. Pretty scary!
  • Cathedral city - First it was a strong thud for 1 second, and concurrently felt the shock waves under my feet. I immediately looked at the chandelier but it was completely still without any motion.
  • La Mesa - I herd it before I felt it
  • Desert Hot Springs - Some shaking and rumbling.. spooked the dogs a little. No damage.
  • fallbrook, ca 92028 - Started with a slight boom with a little movement. After approximately five seconds the walls and blinds began moving along with the dogs barking. Lasted for another 5-10 seconds.
  • San Diego, CA 92121 - about 2 second shake, 5th floor of office building. enough to nauseate me.
  • San Diego Downtown - In my office when I felt a swaying for about 5-6 seconds.
  • CA 92651 - Very like shake and roll ... about 10:15 a.m.
  • Santa Ysabel, CA - A BOOM and then the house jolted towards the west, then it was over.
  • La Puente - A quick jolt followed by some rolling. The towels started swaying and I could see the mouthwash swaying back and forth in the bottle.
  • Rowland Heights - Quick roll
  • Glendale, CA - Felt shaking, swaying motion on 8th floor of office building in Glendale
  • El Segundo - Lasted a long time.
  • indio, CA - I lost a plate off the top of my kitchen cabinets.
  • Claremont, CA - Swaying motion on second floor. Wheeled chairs did not move, and a co-worked didn't notice at all. Nothing rattled.
  • Alpine, CA 91901 - Felt like a boom. I though one of the big oak trees on the property fell down. All three of my dogs jumped up.
  • Murrieta - About 15 seconds, T.V. shook quite a bit, thought it might fall but no damage
  • Menifee 92585 - Boom, jolt and then wave. Didn't last long. Used to earthquakes but this got an audible OH OH OH we are having an earthquake on my business call and I can usually talk right through them.
  • Barton Rd & Mtn View - sitting at work and chair moved underneath enough to get my attention, lasted for approximately 8-10 seconds
  • Highland, CA - I was lying in bed and the bed shook for a second or two. I was upstairs. The rest of my family downstairs didn't feel it but my sister-in-law in Ramona, CA felt it and some in Texas reported feeling it.
  • Valencia, CA - There wasnt really any shaking or movement but it made me feel dizzy.
  • 92124 - it shook twice and enough for me to get up and run for the door
  • Vista, ca - At first it was that an earthquake? Than a rumble and shaking for at least 7 to 10 seconds. It was pretty strong.
  • North Hollywood CA 91606 - While sitting at dining room table it started to move ever so slightly, enough to know there was an earthquake that had just taken place not far from Los Angeles.
  • LA PUENTE CA - sacudida fuerte seguida de otras chicas ,estaba parqueado pero todavia dentro del carro,pense' que algunos conocidos bromeaban empujando el carro volteo y no veo a nadie entonces supe que fue temblores.
  • Murrieta 92562 - Heard it (house creaked) before I felt it. Two distinct events, only 30 sec. apart maybe, with slight shaking. Pictures on wall vibrated a little bit. My 90 year old mother in law didn't notice.
  • Anza Borrego Hellhole Cyn - Very large rocks were rocking. We were on a ridge and I was leaning against a VW sized rock which moved back and forth several inches.
  • USGS Southern California Mar 11 16:55 4.7 0 MAP I Felt It
    USGS Southern California Mar 11 16:36 2.7 12 MAP I Felt It



    Other earlier earthquakes in the greater epicenter area (since 2012)

    Strongest earthquakes Magnitude 3.5 or more within a 150 km radius from this earthquake (max. 60)




    I felt the shaking *
    Country where you felt the earthquake *
    City/Village where you felt the earthquake *
    Street or suburb (area) where you felt the earthquake
    Latitude (area) where you felt the earthquake
    Longitude (area) where you felt the earthquake
    Shaking Strength *
    MMI II (Very weak shaking) ?
    People :
    Felt by persons at rest, on upper floors or favorably placed.
    MMI III (Weak shaking) ?
    People :
    Felt indoors; hanging objects may swing, vibration similar to passing of light trucks, duration may be estimated, may not be recognized as an earthquake.
    MMI IV (Light shaking) ?
    People :
    Generally noticed indoors but not outside. Light sleepers may be awakened. Vibration may be likened to the passing of heavy traffic, or to the jolt of a heavy object falling or striking the building.
    Fittings :
    Doors and windows rattle. Glassware and crockery rattle. Liquids in open vessels may be slightly disturbed. Standing motorcars may rock.
    Structures :
    Walls and frames of buildings, and partitions and suspended ceilings in commercial buildings, may be heard to creak.
    MMI V (Moderate shaking) ?
    People :
    Generally felt outside, and by almost everyone indoors. Most sleepers awakened. A few people alarmed.
    Fittings :
    Small unstable objects are displaced or upset. Some glassware and crockery may be broken. Hanging pictures knock against the wall. Open doors may swing. Cupboard doors secured by magnetic catches may open. Pendulum clocks stop, start, or change rate.
    Structures :
    Some large display windows cracked. A few earthenware toilet fixtures cracked.
    MMI VI (Strong shaking) ?
    People Felt by all. People and animals alarmed. Many run outside. Difficulty experienced in walking steadily.
    Fittings :
    Objects fall from shelves. Pictures fall from walls. Some furniture moved on smooth floors, some unsecured free-standing fireplaces moved. Glassware and crockery broken. Very unstable furniture overturned. Small church and school bells ring. Appliances move on bench or table tops. Filing cabinets or "easy glide" drawers may open (or shut).
    Structures :
    Slight damage to buildings with low standard. Some stucco or cement plaster falls. Large display windows broken. Damage to a few weak domestic chimneys, some may fall.
    Environment :
    Trees and bushes shake, or are heard to rustle. Loose material may be dislodged from sloping ground, e.g. existing slides, talus slopes, shingle slides.
    MMI VII (Very strong shaking) ?
    General alarm. Difficulty experienced in standing. Noticed by motorcar drivers who may stop.
    Fittings :
    Large bells ring. Furniture moves on smooth floors, may move on carpeted floors. Substantial damage to fragile contents of buildings.
    Structures :
    Unreinforced stone and brick walls cracked. Low standard buildings cracked with some minor masonry falls. A few instances of damage to buildings of ordinary workmanship. Unbraced parapets, unbraced brick gables, and architectural ornaments fall. Roofing tiles, especially ridge tiles may be dislodged. Many unreinforced domestic chimneys damaged, often falling from roof-line. Water tanks Type I burst. A few instances of damage to brick veneers and plaster or cement-based linings. Unrestrained water cylinders (hot-water cylinders) may move and leak. Some common windows cracked. Suspended ceilings damaged.
    Environment :
    Water made turbid by stirred up mud. Small slides such as falls of sand and gravel banks, and small rock-falls from steep slopes and cuttings. Instances of settlement of unconsolidated or wet, or weak soils. Some fine cracks appear in sloping ground. A few instances of liquefaction (i.e. small water and sand ejections).
    MMI VIII (Severe shaking) ?
    People Alarm may approach panic. Steering of motorcars greatly affected. Structures : Low standard buildings heavily damaged, some collapse. ordinary workmanship buildings damaged, some with partial collapse. Reinforced masonry or concrete buildings damaged in some cases. A few instances of damage to buildings and bridges designed and built to resist earthquakes. Monuments and pre-1976 elevated tanks and factory stacks twisted or brought down. Some pre-1965 infill masonry panels damaged. A few post-1980 brick veneers damaged. Decayed timber piles of houses damaged. Houses not secured to foundations may move. Most unreinforced domestic chimneys damaged, some below roof-line, many brought down. Environment : Cracks appear on steep slopes and in wet ground. Small to moderate slides in roadside cuttings and unsupported excavations. Small water and sand ejections and localized lateral spreading adjacent to streams, canals, lakes, etc.
    MMI IX (Violent shaking) ?
    Structures Many low standard buildings destroyed. Ordinary workmanship buildings heavily damaged, some collapse. Reinforced masonry or concrete buildings damaged, some with partial collapse. Buildings and bridges designed and built to resist earthquakes damaged in some cases, some with flexible frames seriously damaged. Damage or permanent distortion to some buildings and bridges, designed and built to normal use standards. Houses not secured to foundations shifted off. Brick veneers fall and expose frames. Environment : Cracking of ground conspicuous. Landsliding general on steep slopes. Liquefaction effects intensified and more widespread, with large lateral spreading and flow sliding adjacent to streams, canals, lakes, etc.
    Tell us your experience and how many seconds the shaking lasted + let us know if your property has been damaged (even slight damage). (max. 500 characters)
    * mandatory fields