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Light World Earthquakes Magnitude 4-4.9

Light earthquake, 4.2 mag strikes near Samara in Costa Rica


Earthquake location 9.5351S, -85.557WA light earthquake with magnitude 4.2 (ml/mb) was detected on Thursday, 38 kilometers (24 miles) from Samara in Costa Rica. Unique identifier: us1000h3ab. Ids that are associated to the event: us1000h3ab. Exact location of event, depth 11.87 km, -85.557° West, 9.5351° North. The temblor was picked up at 02:03:12 / 2:03 am (local time epicenter). A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). The epicenter of the earthquake was roughly 11.87 km (7 miles) below the earth’s surface. Date and time of earthquake in UTC/GMT: 20/09/18 / 2018-09-20 08:03:12 / September 20, 2018 @ 8:03 am.

Closest city/cities or villages, with min 5000 pop, to hypocenter/epicentrum was Puntarenas, Santa Cruz, Nicoya. Nearby country/countries, Costa Rica (c. 4 516 000 pop) (That might be effected). Event epicenter was 93 km (58 miles) from Puntarenas (c. 35 700 pop), 69 km (43 miles) from Nicoya (c. 15 300 pop), 81 km (50 miles) from Santa Cruz (c. 12 300 pop).

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 eleven earthquakes of magnitude 3.0 or greater that have been detected nearby. 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.

Did you feel the quake?

Were you asleep? Was it difficult to stand and/or walk? Leave a comment or report about shaking, activity and damage at your city, home and country. 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: 38 km S of Samara, Costa Rica.

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More information

Parameter Value Description
Magnitude 4.2 mb The magnitude for the event.
Longitude -85.557° West Decimal degrees longitude. Negative values for western longitudes.
Latitude 9.5351° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 11.87 km Depth of the event in kilometers.
Place 38km S of Samara, 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 2018-09-20 08:03:12 Time when the event occurred. UTC/GMT
Updated 2018-10-15 08:01:08 Time when the event was most recently updated. UTC/GMT
Timezone offset -360 Timezone offset from UTC in minutes at the event epicenter.
Felt The total number of felt reports
CDI 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 271 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 0.958 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.55 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 167 The largest azimuthal gap between azimuthally adjacent stations (in degrees).
Magnitude Type mb The method or algorithm used to calculate the preferred magnitude for the event.
Event Type earthquake Type of seismic event.
Event ID us1000h3ab Id of event.
Event Code 1000h3ab An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us1000h3ab, A comma-separated list of event ids that are associated to an event.

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