Earthquake with magnitude of Mwpd 7.9 on date 29-07-2021 and time 08:15:47 (Italy) in region Alaska Peninsula, United States [Sea: United States]

A magnitude Mwpd 7.9 earthquake occured in region: Alaska Peninsula, United States [Sea: United States], on

  • 29-07-2021 06:15:47 (UTC)
  • 29-07-2021 08:15:47 (UTC +02:00) Italian time
  • 28-07-2021 22:15:47 (UTC -08:00) local time in the region of the earthquake (America/Anchorage)

and geographic coordinates (lat, lon) 55.543, -158.066 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 5.9
Mwp 7.8
Mwpd 7.9
2021-07-29
06:15:47
55.5434 -158.066 10 2021-07-29
06:29:00
Sala Sismica INGV-Roma 93331791
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-07-29 06:15:47
Latitude 55.5434
Longitude -158.0660
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 93331791

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 8481
Semi-minor axis of confidence ellipse (meter) 2619
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 5
Circular confidence region, given by single value of horizontal uncertainty (meter) 6881.5
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 64.0822
Number of associated phases, regardless of their use for origin computation 64
Number of defining phases 64
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 1.54838
Epicentral distance of station closest to the epicenter (degree) 3.75222
Epicentral distance of station farthest from the epicenter (degree) 43.23649
Number of stations at which the event was observed 56
Number of stations from which data was used for origin computation 56
Magnitudes information

Mwpd:7.9

Field Value
Value 7.9
Uncertainty 0.1
Num. used stations 31
Type of magnitude Mwpd
Reference to an origin 93331791
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2021-07-29 06:29:00

Mwp:7.8

Field Value
Value 7.8
Uncertainty 0.1
Num. used stations 34
Type of magnitude Mwp
Reference to an origin 93331791
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2021-07-29 06:29:00

mb:5.9

Field Value
Value 5.9
Uncertainty 0.1
Num. used stations 32
Type of magnitude mb
Reference to an origin 93331791
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2021-07-29 06:29:00
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
US.AMTX.BHZ.00 2021-07-29T06:23:47.78 10.0 positive automatic P 94 43.2365 -0.617674 0.662437
US.KSU1.BHZ.00 2021-07-29T06:23:46.73 10.0 negative automatic P 86 43.1259 -0.659004 0
US.SCIA.BHZ.00 2021-07-29T06:23:46.63 10.0 positive automatic P 80 43.1383 -0.85781 0
US.CBKS.BHZ.00 2021-07-29T06:23:34.68 10.0 positive automatic P 89 41.5557 0.0189023 0.709061
IU.ANMO.BHZ.00 2021-07-29T06:23:25.97 10.0 negative automatic P 98 40.506 -0.236826 0.737474
US.EYMN.BHZ.00 2021-07-29T06:23:23.40 10.0 positive automatic P 72 40.275 -0.666387 0.741906
IU.TUC.BHZ.00 2021-07-29T06:23:22.52 10.0 negative automatic P 105 40.0807 -0.00926854 0.754627
US.ECSD.BHZ.00 2021-07-29T06:23:20.88 10.0 positive automatic P 80 40.0567 -1.37996 0.764304
IU.JOHN.BHZ.00 2021-07-29T06:23:18.30 10.0 negative automatic P 197 39.7863 -1.62481 0.346765
US.SDCO.BHZ.00 2021-07-29T06:23:14.10 10.0 positive automatic P 95 39.0386 -0.0249665 0.748043
US.OGNE.BHZ.00 2021-07-29T06:23:12.00 10.0 positive automatic P 88 38.8175 -0.0101718 0.761115
US.MVCO.BHZ.00 2021-07-29T06:23:02.60 10.0 negative automatic P 98 37.7416 -0.544894 0.800916
US.AGMN.BHZ.00 2021-07-29T06:23:01.78 10.0 positive automatic P 74 37.7061 -0.758176 0.782767
US.ISCO.BHZ.00 2021-07-29T06:23:01.40 10.0 positive automatic P 92 37.5594 -0.300266 0.742
US.WUAZ.BHZ.00 2021-07-29T06:22:59.55 10.0 positive automatic P 103 37.3533 -0.202554 0.828705
DK.TULEG.BHZ. 2021-07-29T06:22:52.65 10.0 negative automatic P 23 36.5194 0.257376 0.815821
IU.YSS.BHZ.00 2021-07-29T06:22:54.50 10.0 positive automatic P 282 36.8185 -0.46352 0.73939
II.PFO.BHZ.00 2021-07-29T06:22:47.55 10.0 negative automatic P 110 36.0266 -0.845955 0.788246
IU.YAK.BHZ.00 2021-07-29T06:22:46.67 10.0 positive automatic P 311 35.9874 -1.18383 0.807352
IU.RSSD.BHZ.00 2021-07-29T06:22:45.15 10.0 positive automatic P 85 35.6481 -0.140534 0.8538
IU.POHA.BHZ.00 2021-07-29T06:22:45.10 10.0 negative automatic P 176 35.8354 -1.78443 0.38292
G.KIP.BHZ.00 2021-07-29T06:22:30.30 10.0 negative automatic P 180 34.1219 -1.47535 0.733806
US.BW06.BHZ.00 2021-07-29T06:22:25.40 10.0 positive automatic P 92 33.3761 -0.245594 0.880383
US.DUG.BHZ.00 2021-07-29T06:22:24.63 10.0 positive automatic P 98 33.2365 0.328046 0.90485
US.LAO.BHZ.00 2021-07-29T06:22:21.58 10.0 positive automatic P 83 32.8846 0.453856 0.901434
US.AHID.BHZ.00 2021-07-29T06:22:18.60 10.0 negative automatic P 93 32.5053 0.615646 0.867715
US.ELK.BHZ.00 2021-07-29T06:22:09.68 10.0 negative automatic P 100 31.5082 0.402291 0.919914
II.FFC.BHZ.00 2021-07-29T06:22:05.67 10.0 positive automatic P 68 31.1889 -0.460747 0.884632
IU.MIDW.BHZ.00 2021-07-29T06:22:05.07 10.0 negative automatic P 215 30.6408 3.82752 0.736817
BK.SAO.BHZ.00 2021-07-29T06:22:03.55 10.0 negative automatic P 112 30.9837 -0.776029 0.920215
BK.CMB.BHZ.00 2021-07-29T06:22:00.87 10.0 negative automatic P 109 30.6002 -0.131089 0.962358
CN.RES.BHZ. 2021-07-29T06:21:58.53 10.0 positive automatic P 28 30.3755 -0.371322 0.955686
US.HLID.BHZ.00 2021-07-29T06:21:57.43 10.0 negative automatic P 95 30.1304 0.392962 0.96107
US.EGMT.BHZ.00 2021-07-29T06:21:56.58 10.0 positive automatic P 84 30.1543 -0.543757 0.927037
BK.MCCM.BHZ.00 2021-07-29T06:21:47.55 10.0 negative automatic P 112 29.1959 -0.906003 0.879121
US.WVOR.BHZ.00 2021-07-29T06:21:42.68 10.0 negative automatic P 101 28.4888 0.274965 0.930233
US.MSO.BHZ.00 2021-07-29T06:21:41.70 10.0 positive automatic P 89 28.4499 -0.335901 0.963855
US.BMO.BHZ.00 2021-07-29T06:21:35.70 10.0 negative automatic P 95 27.7036 0.341463 0.941176
IU.MA2.BHZ.00 2021-07-29T06:21:28.57 10.0 positive automatic P 300 27.0395 -0.682929 0.784314
US.NEW.BHZ.00 2021-07-29T06:21:18.93 10.0 positive automatic P 89 25.8675 0.182522 0.963855
US.HAWA.BHZ.00 2021-07-29T06:21:16.03 10.0 positive automatic P 95 25.5372 0.346733 0.97561
IU.PET.BHZ.00 2021-07-29T06:21:08.72 10.0 positive automatic P 282 24.9787 -1.84267 0.714286
US.NLWA.BHZ.00 2021-07-29T06:20:47.73 10.0 negative automatic P 97 22.5298 0.862277 0.952381
IU.BILL.BHZ.00 2021-07-29T06:20:25.32 10.0 positive automatic P 322 20.4506 0.8571 0.869565
CN.BBB.BHZ. 2021-07-29T06:19:54.40 10.0 negative automatic P 88 17.8329 -0.621429 0.952381
CN.INK.BHZ. 2021-07-29T06:19:41.18 10.0 positive automatic P 32 16.9808 -3.24388 0.930233
AT.SMY.BHZ. 2021-07-29T06:19:35.24 10.0 positive automatic P 272 16.4293 -2.19869 0.787402
US.WRAK.BHZ.00 2021-07-29T06:19:09.10 10.0 negative automatic P 76 14.3311 -0.630764 0.952381
AT.CRAG.BHZ. 2021-07-29T06:19:05.20 10.0 negative automatic P 80 14.0494 -0.687854 0.943396
IU.ADK.BHZ.00 2021-07-29T06:18:30.90 10.0 positive automatic P 259 11.5688 -1.11267 0.784314
AK.TNA.BHZ. 2021-07-29T06:18:28.63 10.0 positive automatic P 338 11.0975 3.0797 0.328947
AK.GAMB.BHZ. 2021-07-29T06:18:23.29 10.0 positive automatic P 326 10.6889 3.33937 0.49505
IU.COLA.BHZ.00 2021-07-29T06:18:16.50 10.0 positive automatic P 24 10.5887 -2.11521 0.930233
AT.TTA.BHZ. 2021-07-29T06:17:37.60 10.0 positive automatic P 7 7.4598 1.75242 0.961538
AT.AKUT.BHZ. 2021-07-29T06:16:57.88 10.0 negative automatic P 256 4.6523 0.763988 0.961538
II.KDAK.BHZ.00 2021-07-29T06:16:44.27 10.0 positive automatic P 51 3.7522 -0.492466 0.987654
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