Earthquake with magnitude of Mwp 6.9 on date 14-08-2021 and time 11:57:44 (UTC) in region Alaska Peninsula, United States [Sea: United States]

A magnitude Mwp 6.9 earthquake occured in region: Alaska Peninsula, United States [Sea: United States], on

  • 14-08-2021 11:57:44 (UTC)
  • 14-08-2021 13:57:44 (UTC +02:00) Italian time
  • 14-08-2021 03:57:44 (UTC -08:00) local time in the region of the earthquake (America/Anchorage)

and geographic coordinates (lat, lon) 55.304, -157.793 at 10 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 6.9

Mwpd 7.0
2021-08-14
11:57:44
55.3043 -157.793 10 2021-08-14
12:17:08
Sala Sismica INGV-Roma 94135551
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-14 11:57:44
Latitude 55.3043
Longitude -157.7930
Depth (km) 10 (from location)
Evaluation mode of Origin automatic
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV-A
Event type earthquake
Origin ID 94135551

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 8545
Semi-minor axis of confidence ellipse (meter) 889
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 11
Circular confidence region, given by single value of horizontal uncertainty (meter) 6919.6
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 69.6537
Number of associated phases, regardless of their use for origin computation 142
Number of defining phases 142
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 1.04681
Epicentral distance of station closest to the epicenter (degree) 3.79157
Epicentral distance of station farthest from the epicenter (degree) 69.43414
Number of stations at which the event was observed 134
Number of stations from which data was used for origin computation 134
Magnitudes information

Mwpd:7

Field Value
Value 7
Uncertainty 0.1
Num. used stations 103
Type of magnitude Mwpd
Reference to an origin 94135551
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2021-08-14 12:17:08

Mwp:6.9

Field Value
Value 6.9
Uncertainty 0.1
Num. used stations 108
Type of magnitude Mwp
Reference to an origin 94135551
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2021-08-14 12:17:08

mb:5.7

Field Value
Value 5.7
Uncertainty 0.1
Num. used stations 112
Type of magnitude mb
Reference to an origin 94135551
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2021-08-14 12:17:08
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
GE.VAL.BHZ. 2021-08-14T12:08:52.70 10.0 positive automatic P 21 69.4341 1.22166 0.223544
GE.SLIT.BHZ. 2021-08-14T12:08:36.60 10.0 positive automatic P 360 67.064 -0.0246728 0.146057
CU.TGUH.BHZ.00 2021-08-14T12:08:39.70 10.0 positive automatic P 98 67.4255 0.593936 0
GE.VSU.BHZ. 2021-08-14T12:08:30.30 10.0 positive automatic P 357 66.1726 -0.634555 0.299243
IU.BBSR.BHZ.00 2021-08-14T12:08:25.50 10.0 positive automatic P 68 65.5262 -1.26519 0.313646
GE.PUL.BHZ. 2021-08-14T12:08:22.85 10.0 positive automatic P 355 64.7444 1.15153 0
IU.KONO.BHZ.00 2021-08-14T12:08:22.22 10.0 positive automatic P 7 64.6047 1.41783 0.348072
JP.YOJ.BHZ. 2021-08-14T12:08:15.85 10.0 positive automatic P 276 64.0433 -1.24521 0.229707
GB.LRW.BHZ. 2021-08-14T12:08:11.92 10.0 positive automatic P 13 63.0704 1.23992 0.361668
IU.TEIG.BHZ.00 2021-08-14T12:08:02.12 10.0 positive automatic P 95 61.8877 -0.638385 0.363133
IU.GUMO.BHZ.00 2021-08-14T12:07:49.85 10.0 positive automatic P 250 60.5401 -3.80546 0.258809
IU.DWPF.BHZ.00 2021-08-14T12:07:46.27 10.0 positive automatic P 84 59.6138 -1.00352 0.192394
JP.JOW.BHZ. 2021-08-14T12:07:44.80 10.0 positive automatic P 274 59.2186 0.230281 0.341302
JP.JMZ.BHZ. 2021-08-14T12:07:38.65 10.0 positive automatic P 270 58.3254 0.320693 0
II.LVZ.BHZ.00 2021-08-14T12:07:25.77 10.0 positive automatic P 354 56.4501 0.572479 0.405707
CN.DRLN.BHZ. 2021-08-14T12:07:22.00 10.0 positive automatic P 51 56.1793 -1.19533 0.385236
II.BORG.BHZ.00 2021-08-14T12:07:19.75 10.0 positive automatic P 21 55.4168 2.04222 0.479494
IU.KEV.BHZ.00 2021-08-14T12:07:14.17 10.0 positive automatic P 358 54.8885 0.282416 0.426727
IU.ULN.BHZ.00 2021-08-14T12:07:14.27 10.0 positive automatic P 305 54.8697 0.257215 0.436068
JP.JSU.BHZ. 2021-08-14T12:07:11.00 10.0 positive automatic P 276 54.4312 0.380149 0.319741
IU.HRV.BHZ.00 2021-08-14T12:07:09.62 10.0 positive automatic P 65 54.3297 -0.224853 0.463336
US.GOGA.BHZ.00 2021-08-14T12:07:09.10 10.0 positive automatic P 81 54.4699 -1.75273 0.488417
II.TLY.BHZ.00 2021-08-14T12:07:05.52 10.0 positive automatic P 310 53.6624 0.481458 0.409479
US.PKME.BHZ.00 2021-08-14T12:07:03.10 10.0 positive automatic P 61 53.5185 -0.799193 0.497419
US.BLA.BHZ.00 2021-08-14T12:07:02.43 10.0 positive automatic P 75 53.3904 -0.626109 0.511304
JP.JTU.BHZ. 2021-08-14T12:07:00.40 10.0 positive automatic P 279 52.7972 1.01672 0.240374
IU.XMAS.BHZ.00 2021-08-14T12:07:00.93 10.0 negative automatic P 180 53.2579 -2.89909 0.236963
US.LBNH.BHZ.00 2021-08-14T12:06:59.10 10.0 positive automatic P 64 52.9124 -0.377936 0.501063
US.LRAL.BHZ.00 2021-08-14T12:06:56.63 10.0 negative automatic P 84 52.7517 -1.63227 0.527827
IM.TKL.BHZ. 2021-08-14T12:06:55.67 10.0 positive automatic P 79 52.6519 -1.88781 0.369284
IU.INCN.BHZ.00 2021-08-14T12:06:55.12 10.0 positive automatic P 283 52.2103 0.891606 0.244755
US.BINY.BHZ.00 2021-08-14T12:06:54.20 10.0 positive automatic P 68 52.2369 -0.301065 0.463636
IU.SSPA.BHZ.00 2021-08-14T12:06:54.07 10.0 positive automatic P 71 52.3243 -1.03931 0.534818
DK.NRS.BHZ. 2021-08-14T12:06:52.90 10.0 positive automatic P 34 51.9957 0.266278 0.509531
US.TZTN.BHZ.00 2021-08-14T12:06:52.20 10.0 positive automatic P 78 52.1372 -1.53996 0.0858559
US.MCWV.BHZ.00 2021-08-14T12:06:51.60 10.0 positive automatic P 73 51.9564 -0.774245 0.528146
US.VBMS.BHZ.00 2021-08-14T12:06:48.75 10.0 positive automatic P 87 51.3609 0.867954 0.550745
G.IVI.BHZ.00 2021-08-14T12:06:46.20 10.0 positive automatic P 36 51.0612 0.569201 0.536361
US.LONY.BHZ.00 2021-08-14T12:06:46.50 10.0 positive automatic P 65 51.2858 -0.891989 0.539008
JP.JCJ.BHZ. 2021-08-14T12:06:45.50 10.0 positive automatic P 262 51.118 -0.582904 0.460483
JP.JMN.BHZ. 2021-08-14T12:06:45.30 10.0 positive automatic P 275 50.8473 1.18903 0.357114
US.KVTX.BHZ.00 2021-08-14T12:06:44.63 10.0 negative automatic P 98 50.7012 1.7113 0.43578
DK.ANGG.BHZ. 2021-08-14T12:06:43.85 10.0 positive automatic P 27 50.8889 -0.480463 0.551985
DK.ISOG.BHZ. 2021-08-14T12:06:41.95 10.0 positive automatic P 28 50.5873 -0.107574 0.556995
DK.SOEG.BHZ.00 2021-08-14T12:06:41.20 10.0 positive automatic P 23 50.36 0.831323 0.535295
DK.SCO.BHZ. 2021-08-14T12:06:40.80 10.0 positive automatic P 18 50.3146 0.795248 0.536019
US.OXF.BHZ.00 2021-08-14T12:06:38.98 10.0 positive automatic P 85 50.3088 -0.991121 0.54858
IU.HKT.BHZ.00 2021-08-14T12:06:37.82 10.0 negative automatic P 94 50.0206 0.124266 0.580285
US.ERPA.BHZ.00 2021-08-14T12:06:37.75 10.0 positive automatic P 71 50.1611 -1.12941 0.538471
IU.WVT.BHZ.00 2021-08-14T12:06:36.80 10.0 positive automatic P 82 50.0346 -1.10561 0.573057
US.ACSO.BHZ.00 2021-08-14T12:06:35.08 10.0 positive automatic P 75 49.8401 -1.37141 0.434893
US.NATX.BHZ.00 2021-08-14T12:06:33.38 10.0 negative automatic P 91 49.3433 0.740391 0.58486
DK.NUUK.BHZ.00 2021-08-14T12:06:22.40 10.0 positive automatic P 34 47.8318 1.41136 0.576368
JP.JHJ2.BHZ. 2021-08-14T12:06:22.15 10.0 positive automatic P 269 47.9221 0.466597 0.277961
US.MIAR.BHZ.00 2021-08-14T12:06:21.23 10.0 negative automatic P 88 47.918 -0.450698 0.617011
G.INU.BHZ.00 2021-08-14T12:06:21.11 10.0 positive automatic P 274 47.885 -0.295695 0.4965
JP.JGF.BHZ. 2021-08-14T12:06:18.35 10.0 positive automatic P 274 47.5183 -0.284197 0.473869
US.JCT.BHZ.00 2021-08-14T12:06:17.20 10.0 negative automatic P 97 47.3836 -0.385667 0.611608
DK.DBG.BHZ.00 2021-08-14T12:06:16.90 10.0 positive automatic P 14 47.3187 -0.0777999 0.61274
MX.HPIG.BHZ. 2021-08-14T12:06:13.43 10.0 negative automatic P 105 46.8424 -0.137193 0.621084
IU.CCM.BHZ.00 2021-08-14T12:06:11.42 10.0 positive automatic P 83 46.747 -1.13701 0.630266
GE.SFJD.BHZ.00 2021-08-14T12:06:09.97 10.0 positive automatic P 31 46.2783 1.07288 0.631042
IU.MAJO.BHZ.00 2021-08-14T12:06:09.72 10.0 positive automatic P 274 46.3657 0.12656 0.550808
US.HDIL.BHZ.00 2021-08-14T12:06:07.15 10.0 positive automatic P 79 46.123 -0.500556 0.633798
GE.KBS.BHZ.00 2021-08-14T12:06:05.02 10.0 positive automatic P 3 45.628 1.30091 0.550816
US.GLMI.BHZ.00 2021-08-14T12:06:05.58 10.0 positive automatic P 71 45.8554 -0.000613358 0.609533
GE.SUMG.BHZ. 2021-08-14T12:06:03.70 10.0 positive automatic P 21 45.4946 0.494783 0.576388
GE.DAG.BHZ. 2021-08-14T12:06:02.06 10.0 positive automatic P 12 45.4219 -0.022823 0.631279
DK.ILULI.BHZ. 2021-08-14T12:05:56.90 10.0 positive automatic P 29 44.7101 0.473161 0.562677
US.JFWS.BHZ.00 2021-08-14T12:05:50.08 10.0 positive automatic P 77 44.0211 -0.882475 0.663773
US.MNTX.BHZ.00 2021-08-14T12:05:45.10 10.0 negative automatic P 101 43.3258 -0.269773 0.618209
US.AMTX.BHZ.00 2021-08-14T12:05:43.43 10.0 positive automatic P 94 43.064 0.0619346 0.629348
US.SCIA.BHZ.00 2021-08-14T12:05:43.03 10.0 positive automatic P 80 43.0265 0.0860928 0.689981
MX.SRIG.BHZ. 2021-08-14T12:05:42.50 10.0 negative automatic P 112 42.9867 -0.0699997 0.674655
US.KSU1.BHZ.00 2021-08-14T12:05:42.48 10.0 negative automatic P 86 42.9891 -0.161635 0.690675
MX.HSIG.BHZ. 2021-08-14T12:05:37.16 10.0 negative automatic P 109 42.3253 -0.0653398 0.686685
G.KIP.BHZ.00 2021-08-14T12:04:24.90 10.0 negative automatic P 180 33.8832 -1.15663 0.820937
JP.JTM.BHZ. 2021-08-14T12:05:32.65 10.0 positive automatic P 276 41.829 -0.507081 0.55405
US.CBKS.BHZ.00 2021-08-14T12:05:30.60 10.0 negative automatic P 88 41.407 0.806088 0.657681
US.EYMN.BHZ.00 2021-08-14T12:05:19.88 10.0 positive automatic P 72 40.2018 0.0578509 0.752268
US.ECSD.BHZ.00 2021-08-14T12:05:17.18 10.0 positive automatic P 80 39.9434 -0.497266 0.739489
II.ERM.BHZ.00 2021-08-14T12:05:16.57 10.0 positive automatic P 276 39.8405 -0.168335 0.59456
US.SDCO.BHZ.00 2021-08-14T12:05:09.53 10.0 positive automatic P 94 38.8651 0.496026 0.760195
US.OGNE.BHZ.00 2021-08-14T12:05:07.93 10.0 negative automatic P 88 38.6713 0.785132 0.773041
US.AGMN.BHZ.00 2021-08-14T12:04:58.08 10.0 positive automatic P 74 37.6222 -0.104195 0.766381
US.MVCO.BHZ.00 2021-08-14T12:04:57.83 10.0 negative automatic P 98 37.5552 -0.0984129 0.776594
US.ISCO.BHZ.00 2021-08-14T12:04:56.50 10.0 positive automatic P 92 37.3953 -0.162154 0.583085
US.WUAZ.BHZ.00 2021-08-14T12:04:54.55 10.0 negative automatic P 102 37.15 0.162199 0.749623
IU.YSS.BHZ.00 2021-08-14T12:04:53.00 10.0 positive automatic P 283 37.021 -0.0428577 0.72003
DK.TULEG.BHZ. 2021-08-14T12:04:50.40 10.0 positive automatic P 23 36.6789 0.293446 0.711035
IU.YAK.BHZ.00 2021-08-14T12:04:45.27 10.0 positive automatic P 311 36.261 -1.28624 0.766302
II.PFO.BHZ.00 2021-08-14T12:04:42.60 10.0 positive automatic P 110 35.7993 -0.208966 0.8404
IU.RSSD.BHZ.00 2021-08-14T12:04:40.67 10.0 positive automatic P 85 35.5126 0.191551 0.755307
IU.POHA.BHZ.00 2021-08-14T12:04:39.82 10.0 negative automatic P 176 35.5865 -1.27604 0.535245
NN.PRN.HHZ. 2021-08-14T12:04:25.30 10.0 positive automatic P 104 33.743 0.234842 0.745006
US.TPNV.BHZ.00 2021-08-14T12:04:22.30 10.0 negative automatic P 106 33.4148 0.0672177 0.849244
US.BW06.BHZ.00 2021-08-14T12:04:20.95 10.0 negative automatic P 92 33.2139 0.365382 0.883781
US.DUG.BHZ.00 2021-08-14T12:04:19.13 10.0 negative automatic P 98 33.049 0.105568 0.784509
US.LAO.BHZ.00 2021-08-14T12:04:18.35 10.0 negative automatic P 83 32.7582 1.97459 0.658269
US.HWUT.BHZ.00 2021-08-14T12:04:17.60 10.0 negative automatic P 95 32.8181 0.540199 0.764661
US.AHID.BHZ.00 2021-08-14T12:04:13.68 10.0 negative automatic P 93 32.3378 0.801134 0.842102
US.RLMT.BHZ.00 2021-08-14T12:04:10.60 10.0 negative automatic P 88 31.9377 1.22085 0.910748
US.LKWY.BHZ.00 2021-08-14T12:04:08.20 10.0 positive automatic P 90 31.6253 1.50197 0.681969
US.ELK.BHZ.00 2021-08-14T12:04:04.23 10.0 negative automatic P 100 31.3148 0.305834 0.843703
II.FFC.BHZ.00 2021-08-14T12:04:01.97 10.0 positive automatic P 67 31.1365 -0.057101 0.811899
BK.SAO.BHZ.00 2021-08-14T12:03:58.67 10.0 positive automatic P 112 30.7508 0.0453964 0.883596
CN.RES.BHZ. 2021-08-14T12:03:56.73 10.0 positive automatic P 28 30.5151 0.231944 0.964244
US.BOZ.BHZ.00 2021-08-14T12:03:55.43 10.0 negative automatic P 89 30.315 0.432536 0.934497
BK.CMB.BHZ.00 2021-08-14T12:03:55.50 10.0 positive automatic P 109 30.3759 0.120082 0.843844
US.EGMT.BHZ.00 2021-08-14T12:03:52.90 10.0 negative automatic P 84 30.0261 0.551726 0.90863
US.HLID.BHZ.00 2021-08-14T12:03:52.43 10.0 positive automatic P 95 29.9559 0.575055 0.963855
BK.MCCM.BHZ.00 2021-08-14T12:03:42.85 10.0 negative automatic P 112 28.9634 0.105105 0.888889
US.WVOR.BHZ.00 2021-08-14T12:03:37.13 10.0 positive automatic P 101 28.2925 0.124412 0.842105
US.MSO.BHZ.00 2021-08-14T12:03:37.20 10.0 negative automatic P 89 28.2991 0.153644 0.941176
US.BMO.BHZ.00 2021-08-14T12:03:30.78 10.0 negative automatic P 95 27.527 0.640049 0.963855
IU.MA2.BHZ.00 2021-08-14T12:03:27.42 10.0 positive automatic P 300 27.2935 -0.477081 0.869565
US.NEW.BHZ.00 2021-08-14T12:03:14.30 10.0 positive automatic P 89 25.7171 0.560434 0.963855
US.HAWA.BHZ.00 2021-08-14T12:03:10.95 10.0 negative automatic P 94 25.3635 0.484721 0.91954
IU.PET.BHZ.00 2021-08-14T12:03:08.02 10.0 positive automatic P 283 25.1828 -0.758312 0.930233
IU.COR.BHZ.00 2021-08-14T12:03:01.00 10.0 negative automatic P 102 24.3134 1.13721 0.930233
US.NLWA.BHZ.00 2021-08-14T12:02:42.65 10.0 negative automatic P 96 22.348 1.36577 0.97561
IU.BILL.BHZ.00 2021-08-14T12:02:24.32 10.0 positive automatic P 322 20.7344 0.425287 0.8
CN.INK.BHZ. 2021-08-14T12:01:39.45 10.0 positive automatic P 31 17.1039 -2.86827 0.930233
AT.SMY.BHZ. 2021-08-14T12:01:34.44 10.0 positive automatic P 273 16.5938 -1.45262 0.793651
US.WRAK.BHZ.00 2021-08-14T12:01:04.43 10.0 positive automatic P 75 14.241 -0.434853 0.963855
AT.CRAG.BHZ. 2021-08-14T12:00:58.76 10.0 positive automatic P 79 13.9401 -1.99482 0.961538
AT.SKAG.BHZ. 2021-08-14T12:00:44.84 10.0 positive automatic P 62 12.7284 0.618059 0.813008
IU.ADK.BHZ.00 2021-08-14T12:00:29.52 10.0 positive automatic P 261 11.6803 -0.371172 0.97561
AK.TNA.BHZ. 2021-08-14T12:00:27.35 10.0 positive automatic P 338 11.3769 1.61407 0.763359
AK.GAMB.BHZ. 2021-08-14T12:00:21.65 10.0 positive automatic P 326 10.9739 1.44475 0.990099
IU.COLA.BHZ.00 2021-08-14T12:00:14.55 10.0 positive automatic P 23 10.7455 -2.57073 0.963855
AT.TTA.BHZ. 2021-08-14T11:59:35.24 10.0 positive automatic P 6 7.6793 0.0269836 0.934579
AT.AKUT.BHZ. 2021-08-14T11:58:54.94 10.0 positive automatic P 259 4.7512 0.110959 0.704225
II.KDAK.BHZ.00 2021-08-14T11:58:39.92 10.0 positive automatic P 47 3.7916 -1.74334 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