Earthquake with magnitude of Mwp 6.2 on date 17-08-2021 and time 19:53:33 (Italy) in region South Georgia & the South Sandwich Is. [Sea]

A magnitude Mwp 6.2 earthquake occured in region: South Georgia & the South Sandwich Is. [Sea], on

  • 17-08-2021 17:53:33 (UTC)
  • 17-08-2021 19:53:33 (UTC +02:00) Italian time
  • 17-08-2021 15:53:33 (UTC -02:00) local time in the region of the earthquake (Atlantic/South_Georgia)

and geographic coordinates (lat, lon) -57.86, -25.404 at 77 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 5.5
Mwp 6.2

Mwpd 6.2
2021-08-17
17:53:33
-57.8602 -25.4036 77 2021-08-17
18:13:14
Sala Sismica INGV-Roma 94306201
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-17 17:53:33
Latitude -57.8602
Longitude -25.4036
Depth (km) 77 (from location)
Evaluation mode of Origin automatic
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV-A
Event type earthquake
Origin ID 94306201

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 12286
Semi-minor axis of confidence ellipse (meter) 6119
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 22
Circular confidence region, given by single value of horizontal uncertainty (meter) 10903.5
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 54.3997
Number of associated phases, regardless of their use for origin computation 55
Number of defining phases 55
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 1.35989
Epicentral distance of station closest to the epicenter (degree) 7.13342
Epicentral distance of station farthest from the epicenter (degree) 100.39758
Number of stations at which the event was observed 55
Number of stations from which data was used for origin computation 55
Magnitudes information

Mwp:6.2

Field Value
Value 6.2
Uncertainty 0.1
Num. used stations 17
Type of magnitude Mwp
Reference to an origin 94306201
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2021-08-17 18:13:14

Mwpd:6.2

Field Value
Value 6.2
Uncertainty 0.1
Num. used stations 18
Type of magnitude Mwpd
Reference to an origin 94306201
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2021-08-17 18:13:14

mb:5.5

Field Value
Value 5.5
Uncertainty 0.1
Num. used stations 47
Type of magnitude mb
Reference to an origin 94306201
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2021-08-17 18:13:14
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
II.WRAB.BHZ.00 2021-08-17T18:07:10.95 10.0 negative automatic Pdiff 161 100.3976 0.0156041 0
IU.MBWA.BHZ.00 2021-08-17T18:06:50.47 10.0 negative automatic P 148 95.8172 0.12863 0.0571528
AU.QLP.BHZ. 2021-08-17T18:06:47.62 10.0 positive automatic P 171 95.1055 0.523955 0.0631685
AU.WRKA.BHZ.00 2021-08-17T18:06:43.50 10.0 positive automatic P 156 94.2251 0.363917 0.0650946
IU.TEIG.BHZ.00 2021-08-17T18:06:39.55 10.0 positive automatic P 303 93.7305 -1.22374 0.0642007
G.ATD.BHZ.00 2021-08-17T18:06:19.60 10.0 positive automatic P 66 88.6271 2.42648 0.092706
AU.HTT.BHZ. 2021-08-17T18:06:13.00 10.0 positive automatic P 167 87.7589 0.905743 0.112759
AU.MORW.BHZ. 2021-08-17T18:06:10.85 10.0 positive automatic P 147 87.2578 0.220723 0.115186
G.CAN.BHZ.00 2021-08-17T18:06:08.95 10.0 positive automatic P 175 86.6984 0.968927 0.115317
NZ.OUZ.HHZ.10 2021-08-17T18:06:03.08 10.0 positive automatic P 195 85.555 0.843955 0.12883
CU.SDDR.BHZ.00 2021-08-17T18:06:01.48 10.0 positive automatic P 317 85.7088 -1.61856 0.121433
GE.BOAB.BHZ. 2021-08-17T18:06:00.00 10.0 positive automatic P 302 85.687 -1.95517 0.117546
G.TAM.BHZ.00 2021-08-17T18:05:58.45 10.0 positive automatic P 28 84.6783 0.356919 0.127961
AU.TOO.BHZ.00 2021-08-17T18:05:56.43 10.0 positive automatic P 173 84.2588 0.588666 0.135885
IU.NWAO.BHZ.00 2021-08-17T18:05:54.10 10.0 positive automatic P 149 83.9491 -0.130834 0.133709
II.JTS.BHZ.00 2021-08-17T18:05:50.95 10.0 positive automatic P 301 83.4498 -0.724997 0.144275
IU.SJG.BHZ.00 2021-08-17T18:05:47.67 10.0 positive automatic P 321 83.1111 -2.27642 0.145428
NZ.URZ.HHZ.10 2021-08-17T18:05:45.61 10.0 positive automatic P 198 82.0372 1.30351 0.161096
CU.ANWB.BHZ.00 2021-08-17T18:05:39.15 10.0 positive automatic P 325 81.3062 -1.30864 0.161093
IU.SNZO.BHZ.00 2021-08-17T18:05:31.87 10.0 positive automatic P 195 79.411 1.56471 0.187212
II.TAU.BHZ.00 2021-08-17T18:05:28.97 10.0 positive automatic P 175 79.0434 0.667821 0.175662
NZ.KHZ.HHZ.10 2021-08-17T18:05:26.18 10.0 positive automatic P 194 78.4793 0.987596 0.188567
NZ.ODZ.HHZ.10 2021-08-17T18:05:14.34 10.0 positive automatic P 192 76.2299 1.66773 0.209936
CU.GRGR.BHZ.00 2021-08-17T18:05:11.05 10.0 positive automatic P 323 76.0232 -0.441488 0.214063
II.MBAR.BHZ.00 2021-08-17T18:04:51.27 10.0 positive automatic P 61 72.2224 1.7047 0.238082
IU.OTAV.BHZ.00 2021-08-17T18:04:45.37 10.0 positive automatic P 303 71.5578 -0.583369 0.26263
GT.DBIC.BHZ.00 2021-08-17T18:04:13.90 10.0 positive automatic P 22 66.6426 -1.05926 0.321828
GE.VOI.BHZ. 2021-08-17T18:03:48.35 10.0 positive automatic P 87 62.1688 2.40916 0.372073
II.NNA.BHZ.00 2021-08-17T18:03:30.37 10.0 negative automatic P 298 59.9806 -0.667186 0.411656
GT.LPAZ.BHZ.00 2021-08-17T18:02:35.58 10.0 positive automatic P 305 52.2204 -0.885719 0.489428
CX.MNMCX.BHZ. 2021-08-17T18:02:21.25 10.0 positive automatic P 301 50.3639 -0.90007 0.535308
IU.TSUM.BHZ.00 2021-08-17T18:02:17.62 10.0 negative automatic P 58 49.7572 0.240126 0.557701
GE.WIN.BHZ. 2021-08-17T18:01:55.20 10.0 positive automatic P 59 46.5895 2.12681 0.611073
GT.BOSA.BHZ.00 2021-08-17T18:01:43.55 10.0 negative automatic P 72 45.4448 -0.445378 0.63096
GT.VNDA.BHZ.00 2021-08-17T18:01:38.03 10.0 positive automatic P 182 44.5454 1.35982 0.229383
IU.SBA.BHZ.00 2021-08-17T18:01:34.87 10.0 positive automatic P 184 44.0822 1.91308 0.655048
C.GO03.BHZ. 2021-08-17T18:01:26.23 10.0 negative automatic P 295 43.3976 -1.35935 0.652153
AF.ALKP.BHZ. 2021-08-17T18:01:23.34 10.0 negative automatic P 70 42.8448 0.150299 0.647209
BL.PMNB.HHZ. 2021-08-17T18:01:19.32 10.0 positive automatic P 330 42.2665 0.839538 0.724935
IU.LCO.BHZ.00 2021-08-17T18:01:19.12 10.0 positive automatic P 293 42.4436 -1.02376 0.718006
C.GO04.BHZ. 2021-08-17T18:01:11.75 10.0 negative automatic P 292 41.5344 -0.963073 0.350649
C1.CO02.BHZ. 2021-08-17T18:01:06.18 10.0 positive automatic P 291 40.7916 -0.285674 0.23836
G.PEL.BHZ.00 2021-08-17T18:00:52.20 10.0 positive automatic P 289 39.0636 0.132041 0.765457
GT.CPUP.BHZ.00 2021-08-17T18:00:48.00 10.0 positive automatic P 311 38.7156 -1.06428 0.7911
C.GO05.BHZ. 2021-08-17T18:00:44.18 10.0 positive automatic P 286 38.2236 -0.759639 0.79136
AU.MAW.BHZ. 2021-08-17T18:00:42.18 10.0 positive automatic P 142 37.9074 -0.0809742 0.807413
C1.BO02.BHZ. 2021-08-17T18:00:41.35 10.0 negative automatic P 288 37.8091 -0.236771 0.721428
C.GO06.BHZ. 2021-08-17T18:00:12.43 10.0 negative automatic P 282 34.5099 -1.08109 0.84683
GT.PLCA.BHZ.00 2021-08-17T18:00:01.58 10.0 positive automatic P 281 33.1897 -0.45225 0.844188
C1.LL02.BHZ. 2021-08-17T17:59:52.75 10.0 positive automatic P 277 32.1335 0.0676385 0.896018
G.COYC.BHZ.00 2021-08-17T17:59:40.60 10.0 positive automatic P 273 30.6596 0.893111 0.838447
II.EFI.BHZ.00 2021-08-17T17:57:55.87 10.0 positive automatic P 274 19.6057 1.23806 0.930233
IU.PMSA.BHZ.00 2021-08-17T17:57:53.72 10.0 positive automatic P 233 19.4235 1.07837 0.952381
GE.SNAA.BHZ. 2021-08-17T17:57:17.16 10.0 negative automatic P 155 16.6074 -3.47106 0.869565
II.HOPE.BHZ.00 2021-08-17T17:55:15.62 10.0 negative automatic P 295 7.1334 1.38987 0.888889
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