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Minor World Earthquakes Magnitude -3.9

Minor earthquake: M3.49 quake strikes near San Ramon in California

Earthquake location 37.7939987S, -121.9833298WA minor earthquake magnitude 3.49 (mg/mb) was reported Thursday, 1 kilometers (1 miles) from San Ramon in California. The temblor was reported at 00:06:03 / 12:06 am (local time epicenter) at a depth of 10.66 km (7 miles). Global time of event 02/04/15 / 2015-04-02 07:06:03 / April 2, 2015 @ 7:06 am UTC/GMT. A tsunami warning has not been issued, according to the U.S. Geological Survey. Exact location of event, longitude -121.9833298 West, latitude 37.7939987 North, depth 10.66 km, unique identifier, nc72424876.

Close countries, United States (c. 310 233 000 pop). The epicenter was 51 km (32 miles) from San Jose (c. 945 900 pop), 38 km (24 miles) from San Francisco (c. 805 200 pop), 25 km (16 miles) from Oakland (c. 390 700 pop), 63 km (39 miles) from Stockton (c. 291 700 pop), 27 km (17 miles) from Fremont (c. 214 100 pop). Nearest city, towns to epicentrum/hypocenter was Patterson, Scotts Valley, Winters.

Did you feel it?

Leave a comment or report about shaking, activity and damage at your home, city and country. Read more about the earthquake, Seismometer information, Date-Time, Location, Distances, Parameters and details about this quake, recorded in: 1 km NNW of San Ramon, California.

More information

Parameter Value Description
Magnitude 3.49 mb The magnitude for the event.
Longitude -121.9833298° West Decimal degrees longitude. Negative values for western longitudes.
Latitude 37.7939987° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 10.66 km Depth of the event in kilometers.
Place 1km NNW of San Ramon, California Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time 2015-04-02 07:06:03 Time when the event occurred. UTC/GMT
Updated 2015-04-02 07:20:08 Time when the event was most recently updated. UTC/GMT
Timezone offset -420 Timezone offset from UTC in minutes at the event epicenter.
Felt 375 The total number of felt reports
CDI 4.3 The maximum reported intensity for the event.
MMI 3.7 The maximum estimated instrumental intensity for the event.
Alert Level The alert level from the PAGER earthquake impact scale. Green, Yellow, Orange or Red.
Review Status automatic Indicates whether the event has been reviewed by a human.
Tsunami 0 This flag is set to "1" for large events in oceanic regions and "0" otherwise. The existence or value of this flag does not indicate if a tsunami actually did or will exist.
SIG 349 A number describing how significant the event is. Larger numbers indicate a more significant event.
Network nc The ID of a data contributor. Identifies the network considered to be the preferred source of information for this event.
Sources ,nc, A comma-separated list of network contributors.
Number of Stations Used 73 The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance 0.06515 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.1 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 53 The largest azimuthal gap between azimuthally adjacent stations (in degrees).
Magnitude Type ml The method or algorithm used to calculate the preferred magnitude for the event.
Event Type earthquake Type of seismic event.
Event ID nc72424876 Id of event.
Event Code 72424876 An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,nc72424876, A comma-separated list of event ids that are associated to an event.


  1. Bill Knudson

    I live about 8 miles north of San Ramon in Alamo, CA. Heard a loud noise like a door being slammed followed by a single sharp jolt 5 seconds later. Everyone heard and felt it. House is OK. Cat is scared.

  2. Roberto

    I felt this, in Livermore.

  3. Jeffrey

    Felt this one in Concord…

  4. Zita

    Felt in Walnut Creek

  5. Debby

    Felt it Danville. Small shaker.

  6. Pete

    good jolt felt in san ramon at midnite april 1 woke me up, no damage Pete

  7. Jim

    I live in San Ramon. The slight jolt woke me up…though I really wasn’t sure whether it was an earthquake or my cat jumping on the bed.

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