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Light World Earthquakes Magnitude 4-4.9

Light earthquake 4.2 mag, 15 km NW of San Isidro, Costa Rica

Earthquake location 9.4866S, -83.7843WA light earthquake with magnitude 4.2 (ml/mb) was reported 15 kilometers (9 miles) from San Isidro in Costa Rica on Sunday. The 4.2-magnitude earthquake has occurred at 18:46:22 / 6:46 pm (local time epicenter). A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). Date and time of earthquake in UTC/GMT: 18/01/16 / 2016-01-18 00:46:22 / January 18, 2016 @ 12:46 am. Id of earthquake: us10004frz. Event ids that are associated: us10004frz. The epicenter of the earthquake was roughly 30.38 km (19 miles) below the earth’s surface. Exact location of earthquake, longitude -83.7843 West, latitude 9.4866 North, depth = 30.38 km.

Nearest city/cities or towns, with min 5000 pop, to epicentrum/hypocenter was San Juan, Atenas, Guácimo. Epicenter of the event was 60 km (37 miles) from San José (c. 335 000 pop), 68 km (42 miles) from San Francisco (c. 55 900 pop), 75 km (47 miles) from Alajuela (c. 47 500 pop), 40 km (25 miles) from Paraíso (c. 39 700 pop), 15 km (10 miles) from San Isidro (c. 34 900 pop), 55 km (34 miles) from Curridabat (c. 34 600 pop). Nearby country/countries, Costa Rica (c. 4 516 000 pop) (That might be effected).

Earthquakes 4.0 to 5.0 are often felt, but only causes minor damage. Every year there are an estimated 13,000 light earthquakes in the world. In the past 24 hours, there have been one, in the last 10 days three, in the past 30 days three and in the last 365 days fifteen earthquakes of magnitude 3.0 or greater that has occurred nearby.

How would you describe the shaking?

Did objects rattle, topple over, or fall off shelves? Leave a comment or report about activity, shaking and damage at your home, country and city. This information comes from the USGS Earthquake Notification Service. Read more about the earthquake, Seismometer information, Date-Time, Location, Distances, Parameters and details about this quake, recorded: 15 km NW of San Isidro, Costa Rica.

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More information

Parameter Value Description
Magnitude 4.2 mb The magnitude for the event.
Longitude -83.7843° West Decimal degrees longitude. Negative values for western longitudes.
Latitude 9.4866° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 30.38 km Depth of the event in kilometers.
Place 15km NW of San Isidro, Costa Rica Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time 2016-01-18 00:46:22 Time when the event occurred. UTC/GMT
Updated 2016-01-20 01:21:58 Time when the event was most recently updated. UTC/GMT
Timezone offset -360 Timezone offset from UTC in minutes at the event epicenter.
Felt 11 The total number of felt reports
CDI 4.9 The maximum reported intensity for the event.
MMI 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 reviewed 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 277 A number describing how significant the event is. Larger numbers indicate a more significant event.
Network us The ID of a data contributor. Identifies the network considered to be the preferred source of information for this event.
Sources ,us, A comma-separated list of network contributors.
Number of Stations Used The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance 0.147 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.94 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 144 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 us10004frz Id of event.
Event Code 10004frz An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us10004frz, A comma-separated list of event ids that are associated to an event.

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