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Minor earthquake, 3.98 mag has occurred near Fremont in California

Earthquake location 37.5806656S, -121.9766693WA minor earthquake with magnitude 3.98 (ml/mb) was reported 3 kilometers (2 miles) from Fremont in California on Tuesday. Global date and time of event UTC/GMT: 21/07/15 / 2015-07-21 09:41:14 / July 21, 2015 @ 9:41 am. The 3.98-magnitude earthquake has occurred at 02:41:14 / 2:41 am (local time epicenter). A tsunami warning has been issued near Fremont in California (Does not indicate if a tsunami actually did or will exist). The earthquake occurred at a depth of 8.12 km (5 miles). Exact location of event, longitude -121.9766693 West, latitude 37.5806656 North, depth = 8.12 km. Event id: nc72490826. Ids that are associated to the earthquake: at00nru08r, nc72490826.

Closest city/cities or villages, with min 5000 pop, to hypocenter/epicentrum was Ceres, Newman, Sonoma. Epicenter of the event was 28 km (17 miles) from San Jose (c. 945 900 pop), 45 km (28 miles) from San Francisco (c. 805 200 pop), 36 km (22 miles) from Oakland (c. 390 700 pop), 73 km (46 miles) from Stockton (c. 291 700 pop), 4 km (2 miles) from Fremont (c. 214 100 pop), 87 km (54 miles) from Modesto (c. 201 200 pop). Nearby country/countries that might be effected, United States (c. 310 233 000 pop).

Earthquakes 3.0 to 4.0 are often felt, but only causes minor damage. There are an estimated 130,000 minor quakes in the world each year. In the past 24 hours, there have been one, in the last 10 days one, in the past 30 days one and in the last 365 days thirty-four earthquakes of magnitude 3.0 or greater that has occurred nearby.

Did you feel the quake?

How did you respond? Did any furniture slide, topple over, or become displaced? Leave a comment or report about activity, shaking and damage at your home, city and country. Read more about the earthquake, Location, Distances, Seismometer information, Date-Time, Parameters and details about this quake, reported near: 3 km NNE of Fremont, California. This information comes from the USGS Earthquake Notification Service.

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More information

Parameter Value Description
Magnitude 3.98 mb The magnitude for the event.
Longitude -121.9766693° West Decimal degrees longitude. Negative values for western longitudes.
Latitude 37.5806656° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 8.12 km Depth of the event in kilometers.
Place 3km NNE of Fremont, California Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time 2015-07-21 09:41:14 Time when the event occurred. UTC/GMT
Updated 2015-07-21 10:00:06 Time when the event was most recently updated. UTC/GMT
Timezone offset -420 Timezone offset from UTC in minutes at the event epicenter.
Felt 199 The total number of felt reports
CDI 3.8 The maximum reported intensity for the event.
MMI 4.39 The maximum estimated instrumental intensity for the event.
Alert Level green 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 1 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 319 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 ,at,nc, A comma-separated list of network contributors.
Number of Stations Used 85 The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance 0.02888 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.14 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 22 The largest azimuthal gap between azimuthally adjacent stations (in degrees).
Magnitude Type mw The method or algorithm used to calculate the preferred magnitude for the event.
Event Type earthquake Type of seismic event.
Event ID nc72490826 Id of event.
Event Code 72490826 An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,at00nru08r,nc72490826, A comma-separated list of event ids that are associated to an event.


  1. Linda

    It woke us up.I thought the dog was on the bed scratching but he wasn’t.This one was very unusual for a California quake.It was so fast and hard just like a dog scratching itself.We are 15 miles from Fremont.It was a real jerky quake not like the ones we usually get that just roll and sway.This one really shook you.There were three in Oklahoma and one in Japan so far today.I’m going back to bed now.Good night.

  2. Mary

    The one in Fremont was only 5 miles deep which is why it was rough, but I live in Oregon and we’re just waiting for the 9.+ they are predicting for us :/

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