Earthquake with magnitude of Mwp 6.1 on date 20-12-2021 and time 21:10:23 (Italy) in region Near coast of northern California, United States [Sea: United States]

A magnitude Mwp 6.1 earthquake occured in region: Near coast of northern California, United States [Sea: United States], on

  • 20-12-2021 20:10:23 (UTC)
  • 20-12-2021 21:10:23 (UTC +01:00) Italian time
  • 20-12-2021 13:10:23 (UTC -07:00) local time in the region of the earthquake (America/Boise)

and geographic coordinates (lat, lon) 40.3520, -124.4430 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
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 6.1

Mwpd 6.2
2021-12-20
20:10:23
40.3523 -124.443 20 2021-12-20
20:34:48
Sala Sismica INGV-Roma 98765851
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-20 20:10:23
Latitude 40.3523
Longitude -124.4430
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 98765851

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 9041
Semi-minor axis of confidence ellipse (meter) 2111
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 65
Circular confidence region, given by single value of horizontal uncertainty (meter) 7329.8
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 172.78
Number of associated phases, regardless of their use for origin computation 96
Number of defining phases 96
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 1.59186
Epicentral distance of station closest to the epicenter (degree) 2.51746
Epicentral distance of station farthest from the epicenter (degree) 61.69728
Number of stations at which the event was observed 91
Number of stations from which data was used for origin computation 91
Magnitudes information

Mwp:6.1

Field Value
Value 6.1
Uncertainty 0.1
Num. used stations 40
Type of magnitude Mwp
Reference to an origin 98765851
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2021-12-20 20:34:48

Mwpd:6.2

Field Value
Value 6.2
Uncertainty 0.1
Num. used stations 12
Type of magnitude Mwpd
Reference to an origin 98765851
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2021-12-20 20:34:48

mb:5.4

Field Value
Value 5.4
Uncertainty 0.1
Num. used stations 65
Type of magnitude mb
Reference to an origin 98765851
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2021-12-20 20:34:48
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IU.YAK.BHZ.00 2021-12-20T20:20:49.52 10.0 positive automatic sP 329 61.6973 2.317 0
IU.YAK.BHZ.00 2021-12-20T20:20:44.57 10.0 negative automatic pP 329 61.6973 -0.866331 0
IU.YAK.BHZ.00 2021-12-20T20:20:38.97 10.0 positive automatic P 329 61.6973 -0.165677 0.38746
IU.OTAV.BHZ.00 2021-12-20T20:20:21.27 10.0 positive automatic sP 122 57.8477 -0.398586 0
IU.OTAV.BHZ.00 2021-12-20T20:20:15.62 10.0 negative automatic P 122 57.8477 2.38721 0.404257
IU.TIXI.BHZ.00 2021-12-20T20:20:05.42 10.0 positive automatic P 339 56.9356 -0.782874 0.435654
DK.SCO.BHZ. 2021-12-20T20:20:01.95 10.0 positive automatic P 23 56.2715 0.467403 0.435364
IU.SJG.BHZ.00 2021-12-20T20:19:48.75 10.0 positive automatic P 96 54.4103 0.605214 0.233713
GE.DAG.BHZ. 2021-12-20T20:19:46.92 10.0 positive automatic P 16 54.3460 -0.687373 0.453106
DK.ANGG.BHZ. 2021-12-20T20:19:35.15 10.0 positive automatic P 31 52.6061 0.320864 0.489046
DK.ISOG.BHZ. 2021-12-20T20:19:30.95 10.0 negative automatic P 32 52.0938 -0.0771964 0.259952
GE.SUMG.BHZ. 2021-12-20T20:19:20.70 10.0 positive automatic P 23 50.6694 -0.208676 0.530457
CU.SDDR.BHZ.00 2021-12-20T20:19:15.88 10.0 negative automatic P 99 50.0017 0.477306 0.490901
GE.SFJD.BHZ.00 2021-12-20T20:18:54.42 10.0 positive automatic P 31 47.2343 0.353825 0.600022
DK.NUUK.BHZ.00 2021-12-20T20:18:53.30 10.0 negative automatic P 35 47.0653 0.590265 0.576115
CU.MTDJ.BHZ.00 2021-12-20T20:18:51.20 10.0 positive automatic sP 105 45.8101 0.172107 0
II.JTS.BHZ.00 2021-12-20T20:18:50.62 10.0 negative automatic pP 120 46.0246 -0.101348 0
CN.DRLN.BHZ. 2021-12-20T20:18:50.88 10.0 negative automatic P 56 46.7316 0.751691 0.623127
DK.KULLO.BHZ. 2021-12-20T20:18:47.38 10.0 negative automatic sP 20 45.3601 0.175129 0
DK.ILULI.BHZ. 2021-12-20T20:18:46.64 10.0 positive automatic P 28 46.9286 -4.9986 0.637889
GE.BOAB.BHZ. 2021-12-20T20:18:34.95 10.0 positive automatic pP 118 43.9670 0.608742 0
US.PKME.BHZ.00 2021-12-20T20:17:56.43 10.0 positive automatic P 64 39.9630 0.952374 0.739215
CN.FRB.BHZ. 2021-12-20T20:17:53.28 10.0 negative automatic P 35 39.6718 0.234992 0.736118
US.LBNH.BHZ.00 2021-12-20T20:17:43.10 10.0 positive automatic P 66 38.3735 0.869742 0.769832
IU.TEIG.BHZ.00 2021-12-20T20:17:30.47 10.0 positive automatic P 112 36.7592 1.96026 0.820877
CN.RES.BHZ. 2021-12-20T20:17:29.63 10.0 negative automatic P 13 36.9098 -0.16074 0.798576
US.LONY.BHZ.00 2021-12-20T20:17:25.73 10.0 positive automatic P 66 36.4389 -0.124478 0.817552
AK.GAMB.BHZ. 2021-12-20T20:17:22.31 10.0 positive automatic P 326 35.9626 0.605923 0.811725
US.BINY.BHZ.00 2021-12-20T20:17:21.90 10.0 positive automatic P 71 35.9683 0.0648772 0.798551
CN.GAC.BHZ. 2021-12-20T20:17:19.00 10.0 positive automatic P 65 35.6244 0.19028 0.854405
IU.SSPA.BHZ.00 2021-12-20T20:17:12.90 10.0 positive automatic P 74 34.9787 -0.396808 0.704661
US.BLA.BHZ.00 2021-12-20T20:17:05.03 10.0 positive automatic P 81 34.1058 -0.773412 0.845165
US.MCWV.BHZ.00 2021-12-20T20:17:03.38 10.0 negative automatic P 76 33.7980 0.305909 0.871685
US.GOGA.BHZ.00 2021-12-20T20:16:58.55 10.0 negative automatic P 89 33.1946 0.76903 0.894952
MX.TLIG.BHZ. 2021-12-20T20:16:54.83 10.0 positive automatic sP 128 31.8864 0.402889 0
IM.TKL.BHZ. 2021-12-20T20:16:48.17 10.0 negative automatic P 85 32.1011 -0.0785092 0.918319
US.TZTN.BHZ.00 2021-12-20T20:16:47.63 10.0 positive automatic P 83 31.9658 0.560678 0.868888
US.LRAL.BHZ.00 2021-12-20T20:16:36.13 10.0 negative automatic P 92 30.6571 0.632052 0.938327
CN.PAULN.BHZ. 2021-12-20T20:16:28.45 10.0 negative automatic sP 0 28.9945 -0.09454 0
IU.COLA.BHZ.00 2021-12-20T20:16:21.77 10.0 positive automatic sP 339 27.9738 2.2583 0
IU.WVT.BHZ.00 2021-12-20T20:16:18.30 10.0 negative automatic P 86 28.8553 -1.25311 0.97561
US.OXF.BHZ.00 2021-12-20T20:16:15.08 10.0 positive automatic P 91 28.2321 1.08674 0.963855
CN.EAGLY.BHZ. 2021-12-20T20:16:02.08 10.0 positive automatic P 349 26.9144 -0.21467 0.952381
US.HDIL.BHZ.00 2021-12-20T20:15:58.85 10.0 positive automatic P 78 26.5655 -0.213082 0.909091
MX.ZAIG.BHZ. 2021-12-20T20:15:58.35 10.0 positive automatic sP 127 25.4864 0.62431 0
US.KVTX.BHZ.00 2021-12-20T20:15:57.68 10.0 positive automatic sP 112 25.3278 2.08888 0
US.NATX.BHZ.00 2021-12-20T20:15:53.48 10.0 negative automatic pP 100 25.4181 -1.11481 0
IU.CCM.BHZ.00 2021-12-20T20:15:50.20 10.0 positive automatic P 84 25.6759 -0.819716 0.941176
IU.HKT.BHZ.00 2021-12-20T20:15:50.85 10.0 negative automatic P 105 25.4417 2.06083 0.941176
US.JFWS.BHZ.00 2021-12-20T20:15:48.00 10.0 negative automatic P 73 25.5082 -1.51553 0.930233
II.KDAK.BHZ.00 2021-12-20T20:15:46.07 10.0 negative automatic P 324 25.0329 0.908373 0.43956
US.MIAR.BHZ.00 2021-12-20T20:15:44.78 10.0 negative automatic P 93 25.0458 -0.513228 0.869565
US.EYMN.BHZ.00 2021-12-20T20:15:40.28 10.0 positive automatic P 61 24.6136 -1.12626 0.909091
US.SCIA.BHZ.00 2021-12-20T20:15:31.85 10.0 negative automatic P 76 23.4420 1.2392 0.952381
US.JCT.BHZ.00 2021-12-20T20:15:17.60 10.0 positive automatic P 109 22.2728 -0.70539 0.869565
US.AGMN.BHZ.00 2021-12-20T20:15:10.98 10.0 negative automatic P 59 21.7785 -2.00987 0.930233
US.KSU1.BHZ.00 2021-12-20T20:15:09.40 10.0 negative automatic P 84 21.3546 0.972859 0.952381
MX.HPIG.BHZ. 2021-12-20T20:15:09.21 10.0 negative automatic sP 125 20.5198 1.86869 0
US.WMOK.BHZ.00 2021-12-20T20:15:03.38 10.0 negative automatic P 97 21.0233 -1.51339 0.869565
US.ECSD.BHZ.00 2021-12-20T20:14:59.13 10.0 positive automatic P 71 20.8399 -3.78128 0.930233
AT.SKAG.BHZ. 2021-12-20T20:14:57.74 10.0 positive automatic P 344 20.2912 0.840006 0.925926
CN.ATLI.BHZ. 2021-12-20T20:14:55.35 10.0 positive automatic P 346 20.0945 0.479568 0.898876
US.AMTX.BHZ.00 2021-12-20T20:14:46.80 10.0 positive automatic P 100 18.7795 0.768523 0
US.CBKS.BHZ.00 2021-12-20T20:14:42.00 10.0 negative automatic P 87 19.0401 -1.3298 0.963855
US.MNTX.BHZ.00 2021-12-20T20:14:28.93 10.0 positive automatic P 113 17.6232 2.12698 0.869565
US.OGNE.BHZ.00 2021-12-20T20:14:17.45 10.0 positive automatic P 81 16.9662 -1.26875 0.909091
MX.SRIG.BHZ. 2021-12-20T20:14:13.93 10.0 negative automatic P 139 16.4740 1.59443 0.888889
US.DGMT.BHZ.00 2021-12-20T20:14:10.80 10.0 positive automatic P 54 16.5118 -2.12037 0.963855
MX.HSIG.BHZ. 2021-12-20T20:14:05.46 10.0 negative automatic P 132 15.8227 1.44569 0.930233
IU.ANMO.BHZ.00 2021-12-20T20:13:57.52 10.0 positive automatic P 105 15.1975 1.38052 0.860215
IU.RSSD.BHZ.00 2021-12-20T20:13:57.70 10.0 positive automatic P 69 15.5270 -2.79764 0.963855
US.SDCO.BHZ.00 2021-12-20T20:13:54.18 10.0 positive automatic P 94 14.9090 1.7344 0.869565
US.LAO.BHZ.00 2021-12-20T20:13:46.53 10.0 positive automatic P 58 14.6057 -1.50352 0.842105
US.ISCO.BHZ.00 2021-12-20T20:13:45.95 10.0 positive automatic P 86 14.3913 0.529339 0.851064
IU.TUC.BHZ.00 2021-12-20T20:13:36.70 10.0 negative automatic P 122 13.6022 2.35323 0.952381
US.MVCO.BHZ.00 2021-12-20T20:13:26.20 10.0 positive automatic P 99 12.8083 2.48551 0.444444
US.EGMT.BHZ.00 2021-12-20T20:13:25.25 10.0 positive automatic P 49 12.9939 -0.80525 0.869565
CN.BBB.BHZ. 2021-12-20T20:13:14.95 10.0 negative automatic P 349 12.0967 1.32968 0.909091
US.WUAZ.BHZ.00 2021-12-20T20:13:07.20 10.0 positive automatic P 111 11.3698 3.25132 0.851064
US.BW06.BHZ.00 2021-12-20T20:13:05.53 10.0 positive automatic P 73 11.3799 1.32986 0.952381
US.AHID.BHZ.00 2021-12-20T20:12:50.40 10.0 positive automatic P 72 10.2591 1.58883 0.888889
US.MSO.BHZ.00 2021-12-20T20:12:45.95 10.0 positive automatic P 46 9.9750 1.15157 0.97561
US.HWUT.BHZ.00 2021-12-20T20:12:44.55 10.0 positive automatic P 78 9.7931 2.14639 0.941176
US.NEW.BHZ.00 2021-12-20T20:12:38.10 10.0 negative automatic P 31 9.4787 0.187885 0.941176
II.PFO.BHZ.00 2021-12-20T20:12:34.37 10.0 positive automatic P 134 9.2740 -0.825942 0.930233
US.DUG.BHZ.00 2021-12-20T20:12:31.03 10.0 positive automatic P 87 8.8679 1.36685 0.952381
US.HLID.BHZ.00 2021-12-20T20:12:19.93 10.0 positive automatic P 63 8.1126 0.575304 0.930233
US.ELK.BHZ.00 2021-12-20T20:12:03.98 10.0 positive automatic P 84 7.0016 -0.200228 0.987654
US.HAWA.BHZ.00 2021-12-20T20:12:03.65 10.0 positive automatic P 29 7.0124 -0.355845 0.808081
US.WVOR.BHZ.00 2021-12-20T20:11:32.40 10.0 positive automatic P 63 4.8262 -1.74404 0.952381
IU.COR.BHZ.00 2021-12-20T20:11:26.90 10.0 positive automatic P 11 4.3154 -0.0166573 0.987654
BK.SAO.BHZ.00 2021-12-20T20:11:22.65 10.0 positive automatic P 146 4.2846 -3.87913 0.987654
BK.CMB.BHZ.00 2021-12-20T20:11:20.40 10.0 negative automatic P 125 3.9052 -0.977695 0.952381
BK.MCCM.BHZ.00 2021-12-20T20:10:58.50 10.0 negative automatic P 151 2.5175 -3.6742 0.963855
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