Earthquake with magnitude of Mwp 6.4 on date 29-11-2021 and time 12:40:46 (UTC) in region Southeast of Honshu, Japan [Sea: Japan]

A magnitude Mwp 6.4 earthquake occured in region: Southeast of Honshu, Japan [Sea: Japan], on

  • 29-11-2021 12:40:46 (UTC)
  • 29-11-2021 13:40:46 (UTC +01:00) Italian time
  • 29-11-2021 21:40:46 (UTC +09:00) local time in the region of the earthquake (Asia/Tokyo)

and geographic coordinates (lat, lon) 31.257, 142.762 at 35 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.

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

These three maps show the results of the analysis using the software ShakeMap designed to provide the level of ground shaking experienced in a region using the data recorded by seismometers and strong motion instruments and seismological information regarding the attenuation of the wavefield with distance and the site characteristics. The Shakemaps are determined for research purposes to provide fast estimates of the level of ground shaking produced by the earthquake. The maps are calculated automatically and updated as more data become available. See for additional information. The black star indicates the epicenter. The triangles show the accelerometric and velocimetric stations used in the calculation, colored according to the recorded shaking.

Intensity Shakemap

Intensity Shakemap

This map shows the distribution of instrumental intensities. The intensity is derived through an empirical law that correlates the recorded values of actual ground shaking, e.g., acceleration and velocity, with the macroseismic intensity for Italian earthquakes, as reported in the Italian Macroseismic Database (DBMI15,
Peak ground acceleration Shakemap

Peak ground acceleration Shakemap

This map shows the distribution of peak ground acceleration expressed as percent of the acceleration of gravity (i.e., g = 9.81 m/s²).
Peak velocity Shakemap

Peak velocity Shakemap

This map shows the distribution of peak ground velocities expressed in cm/s.
Felt maps
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web questionnaire

This map shows the distribution of earthquake resentment in the area, expressed in terms of intensity on the MCS scale (Mercalli-Cancani-Sieberg). Intensities are determined using data from questionnaires collected on the website The intensities shown are determined considering all the reports received from each municipality, and are all the more reliable the greater the number of questionnaires. The collected data are subjected to an automatic statistical filter, but are not checked individually. In particular, intensities greater than or equal to the VI degree of the MCS or EMS scale require on-site verification by specialized personnel. The black star is the epicenter of the earthquake that occurred. This map is updated every time citizens fill out new questionnaires. The number of questionnaires processed to obtain this map, the date and time of the last update are shown at the top right.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
mb 5.8
Mwp 6.4
31.2574 142.762 35 2021-11-29
Sala Sismica INGV-Roma 97940281
Preferred location and magnitude until now.
Origin information


Field Value
Time (UTC) 2021-11-29 12:40:46
Latitude 31.2574
Longitude 142.7620
Depth (km) 35 (from location)
Evaluation mode of Origin automatic
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV-A
Event type earthquake
Origin ID 97940281


Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 5738
Semi-minor axis of confidence ellipse (meter) 4096
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 103
Circular confidence region, given by single value of horizontal uncertainty (meter) 5414.1
Confidence level of the uncertainty (%) 68


Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 171.709
Number of associated phases, regardless of their use for origin computation 17
Number of defining phases 17
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 1.14092
Epicentral distance of station closest to the epicenter (degree) 3.11068
Epicentral distance of station farthest from the epicenter (degree) 19.74023
Number of stations at which the event was observed 17
Number of stations from which data was used for origin computation 17
Magnitudes information


Field Value
Value 6.4
Uncertainty 0.1
Num. used stations 15
Type of magnitude Mwp
Reference to an origin 97940281
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2021-11-29 12:55:36


Field Value
Value 5.8
Uncertainty 0.1
Num. used stations 14
Type of magnitude mb
Reference to an origin 97940281
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2021-11-29 12:55:36
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IU.TATO.BHZ.00 2021-11-29T12:45:11.42 10.0 negative automatic P 257 19.7402 -1.19845 0.869565
JP.YOJ.BHZ. 2021-11-29T12:44:59.65 10.0 negative automatic P 254 18.699 -1.55091 0.930233
IU.GUMO.BHZ.00 2021-11-29T12:44:51.32 10.0 positive automatic P 173 17.773 0.793855 0.987654
IU.YSS.BHZ.00 2021-11-29T12:44:24.60 10.0 negative automatic P 360 15.7006 0.156005 0.952381
IU.INCN.BHZ.00 2021-11-29T12:44:12.37 10.0 negative automatic P 299 14.6739 1.40361 0.615385
JP.JOW.BHZ. 2021-11-29T12:43:52.10 10.0 positive automatic P 254 13.403 -1.5878 0.43956
JP.JTU.BHZ. 2021-11-29T12:43:29.75 10.0 positive automatic P 290 11.679 -0.366975 0.43956
JP.JMZ.BHZ. 2021-11-29T12:43:28.75 10.0 positive automatic P 245 11.4927 1.18786 0.952381
II.ERM.BHZ.00 2021-11-29T12:43:16.57 10.0 positive automatic P 2 10.7617 -0.995658 0.952381
JP.JSU.BHZ. 2021-11-29T12:43:14.80 10.0 positive automatic P 275 10.5058 0.678755 0.952381
JP.JTM.BHZ. 2021-11-29T12:43:02.05 10.0 positive automatic P 352 9.6294 -0.0223887 0.888889
JP.JMN.BHZ. 2021-11-29T12:42:37.85 10.0 positive automatic P 291 7.889 -0.438571 0.888889
IU.MAJO.BHZ.00 2021-11-29T12:42:19.62 10.0 negative automatic P 326 6.5 0.416385 0.97561
G.INU.BHZ.00 2021-11-29T12:42:17.26 10.0 positive automatic P 312 6.2991 0.866896 0.930233
JP.JGF.BHZ. 2021-11-29T12:42:16.95 10.0 positive automatic P 315 6.2636 0.964545 0.952381
JP.JSG.BHZ. 2021-11-29T12:42:01.20 10.0 positive automatic P 313 5.1424 0.692861 0.930233
JP.JHJ2.BHZ. 2021-11-29T12:41:30.85 10.0 negative automatic P 307 3.1107 -1.73023 0.952381
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download