Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Mwp 5.6 on date 28-02-2023 and time 11:12:13 (UTC) in region Southeast of Honshu, Japan [Sea: Japan]

A magnitude Mwp 5.6 earthquake occured in region: Southeast of Honshu, Japan [Sea: Japan], on

  • 28-02-2023 11:12:13 (UTC)
  • 28-02-2023 12:12:13 (UTC +01:00) Italian time
  • 28-02-2023 20:12:13 (UTC +09:00) local time in the region of the earthquake (Asia/Tokyo)

and geographic coordinates (lat, lon) 32.9130, 141.8640 at 20 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

Search earthquakes: Any within 30 km radius

The values of hypocentral coordinates and magnitude may be revised at a later time as more information becomes available.

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Municipalities within 20 km from the epicenter

No Italian municipalities within 20 km distance.

Municipalities with at least 50000 inhabitants

No Italian municipalities within 100 km from the epicenter with at least 50000 inhabitants.

Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100 		mb 5.0
Mwp 5.6
Mwpd 6.0 		2023-02-28
11:12:13		 32.9133 141.864 20 2023-02-28
11:25:42		 Sala Sismica INGV-Roma 114879161
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-02-28 11:12:13
Latitude 32.9133
Longitude 141.8640
Depth (km) 20 (from location)
Evaluation mode of Origin automatic
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV-A
Event type earthquake
Origin ID 114879161

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 15543
Semi-minor axis of confidence ellipse (meter) 12898
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 289
Circular confidence region, given by single value of horizontal uncertainty (meter) 13433.6
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 123.932
Number of associated phases, regardless of their use for origin computation 26
Number of defining phases 26
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 2.36207
Epicentral distance of station closest to the epicenter (degree) 1.73110
Epicentral distance of station farthest from the epicenter (degree) 74.24863
Number of stations at which the event was observed 26
Number of stations from which data was used for origin computation 26
Magnitudes information

Mwp:5.6

Field Value
Value 5.6
Uncertainty 0.1
Num. used stations 6
Type of magnitude Mwp
Reference to an origin 114879161
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2023-02-28 11:25:42

Mwpd:6.0

Field Value
Value 6.0
Uncertainty 0.0
Num. used stations 1
Type of magnitude Mwpd
Reference to an origin 114879161
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2023-02-28 11:25:42

mb:5.0

Field Value
Value 5.0
Uncertainty 0.2
Num. used stations 14
Type of magnitude mb
Reference to an origin 114879161
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2023-02-28 11:25:42
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
US.BMO.BHZ.00 2023-02-28T11:23:49.63 10.0 positive automatic P 46 74.2486 2.44391 0.219699
US.NEW.BHZ.00 2023-02-28T11:23:39.98 10.0 positive automatic P 43 72.6163 2.4733 0.244846
GE.DAG.BHZ. 2023-02-28T11:23:20.97 10.0 positive automatic P 355 69.6417 1.61249 0.249374
IU.NWAO.BHZ.00 2023-02-28T11:23:19.22 10.0 positive automatic P 202 69.8038 -1.19322 0.286482
AU.FORT.BHZ.00 2023-02-28T11:22:49.45 10.0 positive automatic P 193 65.0136 -0.61173 0.346907
II.ARTI.BHZ.00 2023-02-28T11:22:14.12 10.0 positive automatic P 320 59.6465 -0.0409129 0.406773
AU.QLP.BHZ. 2023-02-28T11:22:12.32 10.0 positive automatic P 178 59.5371 -1.06684 0.358315
AU.WRKA.BHZ.00 2023-02-28T11:22:10.63 10.0 negative automatic P 194 59.3722 -1.69437 0.425482
AU.EIDS.BHZ. 2023-02-28T11:22:09.67 10.0 positive automatic P 170 58.9372 0.437247 0.431873
IU.MBWA.BHZ.00 2023-02-28T11:22:01.12 10.0 positive automatic P 204 58.0545 -1.95851 0.410378
US.EGAK.BHZ.00 2023-02-28T11:21:44.93 10.0 positive automatic P 30 55.0957 2.88128 0.467838
II.AAK.BHZ.00 2023-02-28T11:21:25.57 10.0 negative automatic P 301 52.7195 0.660099 0.510003
IO.EVN.BHZ. 2023-02-28T11:20:43.15 10.0 positive automatic P 279 47.1928 -0.359855 0
IU.MAKZ.BHZ.00 2023-02-28T11:20:39.85 10.0 positive automatic P 306 46.8076 0.0993473 0.629279
IU.CHTO.BHZ.00 2023-02-28T11:19:49.65 10.0 positive automatic P 261 40.7842 -1.63932 0.72364
GE.SANI.BHZ. 2023-02-28T11:19:24.92 10.0 positive automatic P 206 38.0438 -3.43852 0.785499
IU.ULN.BHZ.00 2023-02-28T11:18:19.92 10.0 positive automatic P 310 30.0757 0.348229 0.950932
IU.MA2.BHZ.00 2023-02-28T11:17:55.07 10.0 positive automatic P 10 27.3082 0.340217 0.930233
JP.YOJ.BHZ. 2023-02-28T11:16:25.25 10.0 positive automatic P 248 18.5286 -1.31246 0.97561
IU.YSS.BHZ.00 2023-02-28T11:15:28.75 10.0 positive automatic P 3 14.0614 -0.683096 0.930233
JP.JMZ.BHZ. 2023-02-28T11:15:03.00 10.0 negative automatic P 235 11.6630 6.34411 0.930233
JP.JMN.BHZ. 2023-02-28T11:13:49.85 10.0 positive automatic P 279 6.7226 0.824192 0.43956
G.INU.BHZ.00 2023-02-28T11:13:21.01 10.0 positive automatic P 303 4.6847 0.0580922 0.888889
IU.MAJO.BHZ.00 2023-02-28T11:13:20.37 10.0 positive automatic P 321 4.7152 -1.04869 0.888889
JP.JSG.BHZ. 2023-02-28T11:13:04.75 10.0 positive automatic P 301 3.5310 -0.342935 0.727273
JP.JHJ2.BHZ. 2023-02-28T11:12:39.30 10.0 positive automatic P 277 1.7311 -1.03038 0.952381
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download