Earthquake with magnitude of Mwp 6.4 on date 20-12-2020 and time 18:23:21 (Italy) in region Near east coast of eastern Honshu, Japan [Sea: Japan]

A magnitude Mwp 6.4 earthquake occured in region: Near east coast of eastern Honshu, Japan [Sea: Japan], on

  • 20-12-2020 17:23:21 (UTC)
  • 20-12-2020 18:23:21 (UTC +01:00) Italian time
  • 21-12-2020 02:23:21 (UTC +09:00) local time in the region of the earthquake (Asia/Tokyo)

and geographic coordinates (lat, lon) 40.718, 142.686 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.

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

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 adjourned progressively as more data become available. See http://shakemap.rm.ingv.it/ for additional information.

The red star indicates the epicenter. The red triangles show the stations of the INGV Italian National Seismic Network and the blue triangles those of the Nationa Accelerometric Network of the Dipartimento della Protezione Civile.

Intensity Shakemap

Intensity Shakemap

This map shows the distribution of the istrumentally derived intensities. To this purpose, it is used a conversion relation between ground acceleration and velocity, and the Mercalli Modificata (MMI - Modified Mercalli Intensity) scale. In general, the Mercalli intensity scale relies on the effects that the ground shaking produces as reported by an observer.
Peak ground acceleration Shakemap

Peak ground acceleration Shakemap

This map shows This map shows the distribution of peak ground acceleration expressed as per cent 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 the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
mb 5.6
Mwp 6.4

Mwpd 6.5
2020-12-20
17:23:21
40.718 142.686 20 2020-12-20
17:37:22
Sala Sismica INGV-Roma 85582641
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-12-20 17:23:21
Latitude 40.7180
Longitude 142.6860
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 85582641

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 7914
Semi-minor axis of confidence ellipse (meter) 6629
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 129
Circular confidence region, given by single value of horizontal uncertainty (meter) 8127.4
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 65.1904
Number of associated phases, regardless of their use for origin computation 123
Number of defining phases 123
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 2.00979
Epicentral distance of station closest to the epicenter (degree) 1.22986
Epicentral distance of station farthest from the epicenter (degree) 73.77605
Number of stations at which the event was observed 97
Number of stations from which data was used for origin computation 97
Magnitudes information

Mwpd:6.5

Field Value
Value 6.5
Uncertainty 0.1
Num. used stations 35
Type of magnitude Mwpd
Reference to an origin 85582641
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2020-12-20 17:37:22

Mwp:6.4

Field Value
Value 6.4
Uncertainty 0.1
Num. used stations 44
Type of magnitude Mwp
Reference to an origin 85582641
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2020-12-20 17:37:22

mb:5.6

Field Value
Value 5.6
Uncertainty 0.1
Num. used stations 55
Type of magnitude mb
Reference to an origin 85582641
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2020-12-20 17:37:22
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
US.HWUT.BHZ.00 2020-12-20T17:34:55.53 10.0 positive automatic P 49 73.776 2.05909 0
US.AHID.BHZ.00 2020-12-20T17:34:52.40 10.0 positive automatic P 47 73.2845 1.80424 0.232211
US.LAO.BHZ.00 2020-12-20T17:34:51.98 10.0 positive automatic P 42 73.2843 1.56273 0
US.DGMT.BHZ.00 2020-12-20T17:34:50.83 10.0 negative automatic P 40 73.0765 1.68309 0
US.EGMT.BHZ.00 2020-12-20T17:34:49.83 10.0 negative automatic PcP 43 70.6051 -5.561 0
US.RLMT.BHZ.00 2020-12-20T17:34:49.48 10.0 positive automatic P 45 72.7448 2.04706 0
US.ELK.BHZ.00 2020-12-20T17:34:46.10 10.0 negative automatic P 51 72.1999 1.89991 0.24941
IU.KONO.BHZ.00 2020-12-20T17:34:45.97 10.0 positive automatic P 337 72.4602 0.558085 0.246552
US.BOZ.BHZ.00 2020-12-20T17:34:45.00 10.0 positive automatic pP 45 71.1717 0.709017 0
US.MSO.BHZ.00 2020-12-20T17:34:26.75 10.0 positive automatic P 45 69.1535 1.27105 0.274503
US.HLID.BHZ.00 2020-12-20T17:34:43.78 10.0 positive automatic sP 48 70.914 -0.926172 0
US.WVOR.BHZ.00 2020-12-20T17:34:27.45 10.0 positive automatic P 51 69.1572 1.93488 0.290799
IU.KIEV.BHZ.00 2020-12-20T17:34:41.12 10.0 positive automatic P 322 71.7149 0.179056 0.248987
US.WVOR.BHZ.00 2020-12-20T17:34:33.18 10.0 positive automatic sP 51 69.1572 -0.607974 0
US.MSO.BHZ.00 2020-12-20T17:34:40.58 10.0 negative automatic sP 45 69.1535 6.83786 0
US.BOZ.BHZ.00 2020-12-20T17:34:39.80 10.0 positive automatic P 45 71.1717 1.89663 0
US.HLID.BHZ.00 2020-12-20T17:34:37.43 10.0 positive automatic P 48 70.914 1.05444 0.276636
US.BMO.BHZ.00 2020-12-20T17:34:36.88 10.0 negative automatic sP 49 68.4847 7.34199 0
IU.GNI.BHZ.00 2020-12-20T17:34:32.92 10.0 positive automatic P 306 70.0878 1.61742 0
GE.HMDM.BHZ. 2020-12-20T17:34:31.97 10.0 negative automatic P 262 70.0911 0.924281 0
GE.SLIT.BHZ. 2020-12-20T17:34:29.15 10.0 positive automatic P 331 69.7758 0.0326544 0.26451
DK.ILULI.BHZ. 2020-12-20T17:34:28.56 10.0 positive automatic P 5 69.5935 0.556959 0.275093
IU.BILL.BHZ.00 2020-12-20T17:34:27.22 10.0 positive automatic S 17 30.2043 0.0153897 0
GE.SUMG.BHZ. 2020-12-20T17:34:24.10 10.0 positive automatic sP 0 66.702 5.23413 0
US.BMO.BHZ.00 2020-12-20T17:34:23.08 10.0 positive automatic P 49 68.4847 1.7735 0.306235
AU.GIRL.BHZ.00 2020-12-20T17:34:21.43 10.0 positive automatic P 208 68.6582 -0.774205 0
II.COCO.BHZ.00 2020-12-20T17:34:16.47 10.0 positive automatic P 229 67.7702 -0.142531 0.304102
GE.VSU.BHZ. 2020-12-20T17:34:14.40 10.0 positive automatic P 329 67.5086 -0.579312 0.290237
AU.QLP.BHZ. 2020-12-20T17:34:11.22 10.0 positive automatic P 178 67.3141 -2.54669 0.295786
US.NEW.BHZ.00 2020-12-20T17:34:10.78 10.0 positive automatic P 46 66.5744 1.61805 0.315193
IU.MBWA.BHZ.00 2020-12-20T17:33:59.25 10.0 positive automatic P 204 65.4528 -2.60093 0.325444
GE.HALK.BHZ. 2020-12-20T17:33:58.45 10.0 positive automatic P 256 64.9766 -0.297749 0.351634
ND.KOUNC.BHZ.00 2020-12-20T17:33:55.65 10.0 negative automatic P 158 64.4748 0.179607 0.341716
II.PALK.BHZ.00 2020-12-20T17:33:53.17 10.0 positive automatic P 257 64.1649 -0.330473 0.345721
DK.KULLO.BHZ. 2020-12-20T17:33:52.08 10.0 positive automatic P 6 63.9333 0.176946 0.367535
GE.MALK.BHZ. 2020-12-20T17:33:48.97 10.0 positive automatic P 258 63.5343 -0.324888 0.3459
GE.DAG.BHZ. 2020-12-20T17:33:38.51 10.0 positive automatic P 355 61.9176 0.00468364 0.384406
DK.TULEG.BHZ. 2020-12-20T17:33:32.75 10.0 positive automatic P 8 61.052 0.0908491 0.396471
II.WRAB.BHZ.00 2020-12-20T17:33:30.20 10.0 positive automatic P 189 61.1413 -3.12391 0.39998
AU.FITZ.BHZ. 2020-12-20T17:33:29.85 10.0 positive automatic P 199 60.9141 -1.88404 0
IU.CTAO.BHZ.00 2020-12-20T17:33:28.97 10.0 positive automatic P 176 60.894 -2.67048 0.372113
IU.KEV.BHZ.00 2020-12-20T17:33:26.37 10.0 positive automatic P 339 60.104 0.167562 0.391267
CN.RES.BHZ. 2020-12-20T17:33:13.85 10.0 negative automatic P 15 58.5382 -1.50957 0.412904
GE.KBS.BHZ.00 2020-12-20T17:33:05.27 10.0 positive automatic P 350 56.9614 0.982096 0.425609
DK.NOR.BHZ. 2020-12-20T17:33:05.90 10.0 positive automatic P 356 57.1913 -0.0045364 0.452552
IU.POHA.BHZ.00 2020-12-20T17:33:02.82 10.0 negative automatic P 92 56.0945 4.36842 0.463642
GE.GSI.BHZ. 2020-12-20T17:33:01.12 10.0 positive automatic P 238 56.6571 -1.01257 0.386908
II.ALE.BHZ.00 2020-12-20T17:32:58.97 10.0 positive automatic P 4 56.1376 0.544388 0.447208
GE.SMRI.BHZ. 2020-12-20T17:32:57.77 10.0 positive automatic P 220 56.2084 -1.18117 0.408995
GE.BKNI.BHZ. 2020-12-20T17:32:52.07 10.0 positive automatic P 234 55.2418 0.0786742 0.482281
GE.JAGI.BHZ. 2020-12-20T17:32:51.37 10.0 positive automatic P 215 55.7671 -4.42234 0.21885
II.NIL.BHZ.00 2020-12-20T17:32:46.32 10.0 positive automatic P 286 54.3155 0.94008 0.443893
AU.MTN.BHZ.00 2020-12-20T17:32:45.30 10.0 positive automatic P 194 54.6182 -2.19555 0.480547
II.ARTI.BHZ.00 2020-12-20T17:32:44.72 10.0 positive automatic P 317 54.1992 0.241912 0.498567
AU.KDU.BHZ.00 2020-12-20T17:32:42.48 10.0 positive automatic P 192 54.2341 -2.2099 0.486436
GE.SOEI.BHZ. 2020-12-20T17:32:35.42 10.0 positive automatic P 203 53.2584 -2.29497 0.513496
IU.HNR.BHZ.00 2020-12-20T17:32:32.37 10.0 negative automatic P 158 52.6238 -0.50164 0
GE.MMRI.BHZ. 2020-12-20T17:32:32.57 10.0 positive automatic P 206 52.8284 -1.81887 0.508291
IN.PBA.HHZ. 2020-12-20T17:32:31.67 10.0 positive automatic P 251 52.4434 0.142618 0.485032
MY.IPM.BHZ. 2020-12-20T17:32:27.57 10.0 positive automatic P 237 52.0116 -0.778498 0.533619
MY.KUM.BHZ. 2020-12-20T17:32:25.62 10.0 positive automatic P 238 51.6321 0.131933 0.539822
CN.INK.BHZ. 2020-12-20T17:32:17.68 10.0 positive automatic P 28 50.4706 0.923305 0.455905
II.KAPI.BHZ.00 2020-12-20T17:32:14.52 10.0 positive automatic P 210 50.3302 -1.21612 0.548315
II.AAK.BHZ.00 2020-12-20T17:32:09.97 10.0 positive automatic P 296 49.5309 0.0753158 0.56144
GE.BNDI.BHZ. 2020-12-20T17:31:46.52 10.0 positive automatic P 198 46.7298 -1.44668 0.534135
IU.COLA.BHZ.00 2020-12-20T17:31:38.35 10.0 positive automatic P 34 45.2844 1.73721 0.64887
GE.LUWI.BHZ. 2020-12-20T17:31:35.47 10.0 positive automatic P 209 45.5203 -2.96871 0.601663
GE.SANI.BHZ. 2020-12-20T17:31:35.37 10.0 positive automatic P 204 45.3961 -2.09148 0.631823
GE.FAKI.BHZ. 2020-12-20T17:31:30.47 10.0 positive automatic P 195 44.6653 -1.2029 0.660043
II.KURK.BHZ.00 2020-12-20T17:31:29.25 10.0 positive automatic P 305 44.3714 -0.0856348 0.673397
II.KDAK.BHZ.00 2020-12-20T17:31:23.02 10.0 positive automatic P 44 43.5804 0.0462151 0.634529
GE.GENI.BHZ. 2020-12-20T17:31:21.02 10.0 positive automatic P 184 43.3698 -0.239958 0.667831
IU.MAKZ.BHZ.00 2020-12-20T17:31:19.82 10.0 positive automatic P 299 43.162 0.147719 0.70434
IU.CHTO.BHZ.00 2020-12-20T17:31:19.12 10.0 positive automatic P 253 43.2205 -0.994826 0.694759
GE.TNTI.BHZ. 2020-12-20T17:31:11.57 10.0 positive automatic P 203 42.2904 -0.935607 0.687418
MY.KKM.BHZ. 2020-12-20T17:31:10.17 10.0 positive automatic P 222 41.9775 0.0836011 0.677398
RM.DLV.BHZ. 2020-12-20T17:31:07.37 10.0 positive automatic P 236 41.5511 0.707761 0.700999
RM.SLV.BHZ. 2020-12-20T17:30:37.77 10.0 positive automatic P 251 38.0334 0.461288 0.767432
AK.TNA.BHZ. 2020-12-20T17:30:30.27 10.0 positive automatic P 31 37.0582 1.31566 0.797511
IU.TIXI.BHZ.00 2020-12-20T17:29:39.87 10.0 positive automatic P 352 31.6771 -2.48992 0.87476
IU.BILL.BHZ.00 2020-12-20T17:29:28.17 10.0 positive automatic P 17 30.2043 -1.25471 0.884929
II.TLY.BHZ.00 2020-12-20T17:29:16.57 10.0 positive automatic P 306 28.7393 0.0878325 0.97561
IU.ULN.BHZ.00 2020-12-20T17:28:53.12 10.0 positive automatic P 298 26.2286 -1.03702 0.930233
AT.SMY.BHZ. 2020-12-20T17:28:41.14 10.0 positive automatic P 50 24.3812 4.03062 0.892857
IU.TATO.BHZ.00 2020-12-20T17:28:28.57 10.0 positive automatic P 235 23.6461 -1.84184 0.8
JP.YOJ.BHZ. 2020-12-20T17:28:19.90 10.0 positive automatic P 231 23.1061 -5.02921 0.363636
IU.YAK.BHZ.00 2020-12-20T17:28:15.97 10.0 positive automatic P 344 22.706 -4.74329 0.869565
IU.MA2.BHZ.00 2020-12-20T17:27:43.17 10.0 positive automatic P 12 19.5216 -3.27286 0.43956
JP.JOW.BHZ. 2020-12-20T17:27:30.15 10.0 positive automatic P 225 18.2844 -2.6439 0.769231
JP.JMZ.BHZ. 2020-12-20T17:27:29.50 10.0 positive automatic P 216 17.6772 4.19816 0.869565
IU.PET.BHZ.00 2020-12-20T17:27:15.62 10.0 positive automatic pP 36 16.373 -1.55723 0
JP.JSU.BHZ. 2020-12-20T17:26:31.15 10.0 positive automatic P 231 13.4821 0.643444 0.888889
JP.JCJ.BHZ. 2020-12-20T17:26:30.85 10.0 positive automatic P 182 13.6279 -1.60644 0.888889
IU.INCN.BHZ.00 2020-12-20T17:26:24.57 10.0 positive automatic P 261 12.8577 2.64787 0.930233
JP.JTU.BHZ. 2020-12-20T17:26:15.65 10.0 positive automatic P 244 12.1907 2.84401 0.930233
JP.JMN.BHZ. 2020-12-20T17:25:43.00 10.0 positive automatic P 228 9.8896 1.59994 0.909091
JP.JHJ2.BHZ. 2020-12-20T17:25:15.40 10.0 positive automatic P 198 7.9401 0.811171 0.888889
G.INU.BHZ.00 2020-12-20T17:25:04.01 10.0 positive automatic P 221 6.9724 2.7006 0.851064
JP.JGF.BHZ. 2020-12-20T17:24:58.65 10.0 positive automatic P 221 6.6093 2.24456 0.634921
IU.YSS.BHZ.00 2020-12-20T17:24:52.05 10.0 positive automatic P 0 6.2407 0.780384 0.869565
IU.MAJO.BHZ.00 2020-12-20T17:24:43.87 10.0 positive automatic P 221 5.4445 3.49373 0.909091
II.ERM.BHZ.00 2020-12-20T17:23:44.07 10.0 negative automatic P 15 1.3444 0.126727 0.97561
JP.JTM.BHZ. 2020-12-20T17:23:42.65 10.0 negative automatic P 274 1.2299 0.266137 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