Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Mwp 5.5 on date 18-09-2023 and time 19:33:04 (UTC) in region Near east coast of eastern Honshu, Japan [Sea: Japan]

A magnitude Mwp 5.5 earthquake occured in region: Near east coast of eastern Honshu, Japan [Sea: Japan], on

  • 18-09-2023 19:33:04 (UTC)
  • 18-09-2023 21:33:04 (UTC +02:00) Italian time
  • 19-09-2023 04:33:04 (UTC +09:00) local time in the region of the earthquake (Asia/Tokyo)

and geographic coordinates (lat, lon) 38.3820, 141.9440 at 65 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 5.4
Mwp 5.5
Mwpd 5.6 		2023-09-18
19:33:04		 38.3818 141.944 65 2023-09-18
19:45:27		 Sala Sismica INGV-Roma 121204431
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-09-18 19:33:04
Latitude 38.3818
Longitude 141.9440
Depth (km) 65 (from location)
Evaluation mode of Origin automatic
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV-A
Event type earthquake
Origin ID 121204431

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 16044402
Semi-minor axis of confidence ellipse (meter) 8401476
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 279
Circular confidence region, given by single value of horizontal uncertainty (meter) 13071300.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 102.661
Number of associated phases, regardless of their use for origin computation 54
Number of defining phases 54
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.776959
Epicentral distance of station closest to the epicenter (degree) 2.50112
Epicentral distance of station farthest from the epicenter (degree) 63.08212
Number of stations at which the event was observed 54
Number of stations from which data was used for origin computation 54
Magnitudes information

Mwpd:5.6

Field Value
Value 5.6
Uncertainty 0.2
Num. used stations 12
Type of magnitude Mwpd
Reference to an origin 121204431
Agency INGV
Autore Auto added
Time of creation (UTC) 2023-09-18 19:45:27

Mwp:5.5

Field Value
Value 5.5
Uncertainty 0.2
Num. used stations 16
Type of magnitude Mwp
Reference to an origin 121204431
Agency INGV
Autore Auto added
Time of creation (UTC) 2023-09-18 19:45:27

mb:5.4

Field Value
Value 5.4
Uncertainty 0.2
Num. used stations 39
Type of magnitude mb
Reference to an origin 121204431
Agency INGV
Autore Auto added
Time of creation (UTC) 2023-09-18 19:45:27
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IU.MBWA.BHZ.00 2023-09-18T19:43:23.80 10.0 positive automatic P 203 7002.1131 0.241974 0.220652
IU.KEV.BHZ.00 2023-09-18T19:43:19.92 10.0 positive automatic P 339 6891.0576 2.13722 0.227822
GE.KBS.BHZ.00 2023-09-18T19:43:00.80 10.0 positive automatic P 350 6567.1818 2.02234 0.244876
IU.CTAO.BHZ.00 2023-09-18T19:42:54.62 10.0 positive automatic P 175 6505.4103 1.17171 0.246612
II.JZAX.BHZ.00 2023-09-18T19:42:34.07 10.0 positive automatic P 297 6187.7838 0.102239 0.27915
II.ARTI.BHZ.00 2023-09-18T19:42:32.82 10.0 positive automatic P 318 6165.1842 0.347563 0.418682
II.SIMI.BHZ.00 2023-09-18T19:42:31.67 10.0 positive automatic P 295 6152.3304 0.083248 0.274731
GE.GSI.BHZ. 2023-09-18T19:42:28.17 10.0 positive automatic P 239 6098.7174 0.314094 0.0883377
GE.SMRI.BHZ. 2023-09-18T19:42:22.22 10.0 positive automatic P 220 5999.106 -0.345604 0.286626
GE.JAGI.BHZ. 2023-09-18T19:42:15.97 10.0 positive automatic P 215 5941.2195 -0.634352 0.285597
PS.PSI.BHZ. 2023-09-18T19:42:12.76 10.0 positive automatic P 239 5883.999 -0.520456 0.266914
GE.LHMI.BHZ. 2023-09-18T19:42:11.92 10.0 positive automatic P 243 5828.5323 0.947419 0.310879
AU.COEN.BHZ.00 2023-09-18T19:42:10.55 10.0 positive automatic P 178 5810.8056 1.35629 0.0540604
AU.MTN.BHZ.00 2023-09-18T19:42:07.85 10.0 positive automatic P 193 5795.6763 -0.309544 0.0795503
AU.KDU.BHZ.00 2023-09-18T19:42:05.40 10.0 positive automatic P 192 5753.1522 0.103238 0.291332
GE.SOEI.BHZ. 2023-09-18T19:41:57.97 10.0 positive automatic P 203 5648.0463 -0.477295 0.105339
MY.KOM.BHZ. 2023-09-18T19:41:56.12 10.0 positive automatic P 233 5605.833 0.288341 0.336071
II.AAK.BHZ.00 2023-09-18T19:41:52.52 10.0 positive automatic P 298 5558.6247 -0.196171 0.333854
MY.KUM.BHZ. 2023-09-18T19:41:51.02 10.0 positive automatic P 239 5542.2411 -0.13126 0.343827
II.BORK.BHZ.00 2023-09-18T19:41:50.65 10.0 positive automatic P 312 5533.683 0.152558 0.55195
II.KAPI.BHZ.00 2023-09-18T19:41:36.47 10.0 positive automatic P 210 5330.8194 0.0480604 0.306059
IO.EVN.BHZ. 2023-09-18T19:41:26.70 10.0 positive automatic P 274 5173.7544 0.374634 0.376617
II.KURK.BHZ.00 2023-09-18T19:41:14.95 10.0 positive automatic P 307 5027.9337 0.277842 0.42796
MY.SBM.BHZ. 2023-09-18T19:41:13.22 10.0 positive automatic P 224 4998.8295 -0.266382 0.42265
IU.MAKZ.BHZ.00 2023-09-18T19:41:03.60 10.0 positive automatic P 301 4866.6729 0.361611 0.342405
GE.LUWI.BHZ. 2023-09-18T19:40:56.02 10.0 positive automatic P 209 4794.7005 -2.20426 0.215723
GE.SANI.BHZ. 2023-09-18T19:40:55.97 10.0 positive automatic P 204 4776.0858 -0.180397 0.388916
GE.FAKI.BHZ. 2023-09-18T19:40:51.12 10.0 positive automatic P 194 4690.9377 0.939597 0.221518
IU.CHTO.BHZ.00 2023-09-18T19:40:48.70 10.0 positive automatic P 255 4664.0313 -0.169122 0.48551
PS.JAY.BHZ. 2023-09-18T19:40:41.71 10.0 positive automatic P 182 4541.0988 1.9038 0.488875
GE.TNTI.BHZ. 2023-09-18T19:40:31.47 10.0 positive automatic P 203 4430.8314 0.11997 0.142104
RM.DLV.BHZ. 2023-09-18T19:40:30.92 10.0 positive automatic P 237 4416.8121 -0.525759 0.287104
IU.TIXI.BHZ.00 2023-09-18T19:39:39.82 10.0 positive automatic P 353 3764.4873 0.0451803 0.613767
II.TLY.BHZ.00 2023-09-18T19:39:03.05 10.0 positive automatic P 309 3297.3105 -0.838089 0.941176
IU.ULN.BHZ.00 2023-09-18T19:38:38.07 10.0 positive automatic P 302 2985.7335 -0.650375 0.909091
IU.YAK.BHZ.00 2023-09-18T19:38:18.22 10.0 positive automatic P 346 2754.9201 -0.284675 1.18973
IU.MA2.BHZ.00 2023-09-18T19:37:52.87 10.0 positive automatic P 12 2433.7416 1.00335 0.930233
JP.YOJ.BHZ. 2023-09-18T19:37:44.35 10.0 positive automatic P 235 2357.8398 -0.524349 0.909091
JP.JMZ.BHZ. 2023-09-18T19:36:38.25 10.0 positive automatic P 219 1717.6917 -0.206403 0.909091
IU.INCN.BHZ.00 2023-09-18T19:35:54.67 10.0 positive automatic P 270 1343.4441 0.363859 0.888889
PS.TJN.BHZ. 2023-09-18T19:35:49.51 10.0 positive automatic P 265 1303.6617 1.01887 1.65526
JP.JSU.BHZ. 2023-09-18T19:35:47.25 10.0 positive automatic P 237 1292.5062 -0.440798 1.47294
JP.JCJ.BHZ. 2023-09-18T19:35:42.70 10.0 positive automatic P 179 1252.9014 0.367197 0.97561
JP.JTU.BHZ. 2023-09-18T19:35:36.85 10.0 positive automatic P 253 1197.8787 0.622881 1.17168
IU.YSS.BHZ.00 2023-09-18T19:35:04.40 10.0 positive automatic P 4 954.3003 -1.59789 0.615385
JP.JMN.BHZ. 2023-09-18T19:34:57.15 10.0 positive automatic P 237 888.5328 -0.738679 1.23174
JP.JKA.BHZ. 2023-09-18T19:34:25.90 10.0 positive automatic P 5 639.0603 -0.794861 0.97561
JP.JHJ2.BHZ. 2023-09-18T19:34:22.10 10.0 positive automatic P 199 615.2064 -1.77123 0.851064
G.INU.BHZ.00 2023-09-18T19:34:16.76 10.0 positive automatic P 234 550.9929 0.171896 1.6559
JP.JSG.BHZ. 2023-09-18T19:34:14.65 10.0 positive automatic P 220 530.5245 -0.139567 0.280151
JP.JGF.BHZ. 2023-09-18T19:34:11.80 10.0 positive automatic P 234 510.4224 0.308214 2.70213
II.ERM.BHZ.00 2023-09-18T19:33:59.27 10.0 positive automatic P 14 416.1501 0.994654 0.952381
IU.MAJO.BHZ.00 2023-09-18T19:33:55.57 10.0 positive automatic P 239 387.4011 -0.238705 2.16466
JP.JTM.BHZ. 2023-09-18T19:33:41.15 10.0 positive automatic P 345 277.6221 -0.491756 1.11083
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