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Light World Earthquakes Magnitude 4-4.9

Light earthquake, 4.2 mag strikes near Katsuura in Japan

Earthquake location 34.7581S, 140.3378WA light earthquake magnitude 4.2 (ml/mb) has occurred on Wednesday, 41 kilometers (25 miles) from Katsuura in Japan. The 4.2-magnitude earthquake was detected at 03:10:26 / 3:10 am (local time epicenter). A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). The earthquake occurred at a depth of 53.83 km (33 miles) below the earth’s surface. Unique identifier: us10008ryd. Ids that are associated to the event: us10008ryd. Exact location, longitude 140.3378° East, latitude 34.7581° North, depth = 53.83 km. Date and time of earthquake in UTC/GMT: 09/05/17 / 2017-05-09 18:10:26 / May 9, 2017 @ 6:10 pm.

Closest city/cities/towns to epicentrum/hypocenter was Zushi, Hayama, Tōgane (min 5000 pop). Nearby country/countries that might be effected, Japan (c. 127 288 000 pop). Event epicenter was 85 km (53 miles) from Yokosuka (c. 429 000 pop), 87 km (54 miles) from Ichihara (c. 283 500 pop), 78 km (49 miles) from Kisarazu (c. 122 500 pop), 73 km (46 miles) from Mobara (c. 97 300 pop), 75 km (47 miles) from Kimitsu (c. 92 100 pop), 88 km (55 miles) from Tōgane (c. 66 300 pop).

Earthquakes 4.0 to 5.0 are often felt, but only causes minor damage. There are an estimated 13,000 light earthquakes in the world each year. In the past 24 hours, there have been two, in the last 10 days three, in the past 30 days six and in the last 365 days fourty-six earthquakes of magnitude 3.0 or greater that have been detected in the same area.

Did you feel it?

What was your situation during the earthquake? Leave a comment or report about damage, shaking and activity at your home, city 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: 41 km S of Katsuura, Japan.

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More information

Parameter Value Description
Magnitude 4.2 mb The magnitude for the event.
Longitude 140.3378° East Decimal degrees longitude. Negative values for western longitudes.
Latitude 34.7581° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 53.83 km Depth of the event in kilometers.
Place 41km S of Katsuura, Japan Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time 2017-05-09 18:10:26 Time when the event occurred. UTC/GMT
Updated 2017-06-02 17:33:21 Time when the event was most recently updated. UTC/GMT
Timezone offset 540 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 1.695 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.92 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 152 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 us10008ryd Id of event.
Event Code 10008ryd An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us10008ryd, A comma-separated list of event ids that are associated to an event.

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