Earthquake with magnitude of Mwp 6.2 on date 17-08-2021 and time 17:53:33 (UTC) 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 updated as more data become available. See http://shakemap.ingv.it for additional information. The black star indicates the epicenter. The triangles show the accelerometric and velocimetric stations used in the calculation, colored according to the recorded shaking.

Intensity Shakemap

Intensity Shakemap

This map shows the distribution of instrumental intensities. The intensity is derived through an empirical law that correlates the recorded values of actual ground shaking, e.g., acceleration and velocity, with the macroseismic intensity for Italian earthquakes, as reported in the Italian Macroseismic Database (DBMI15, https://doi.org/10.13127/cpti/cpti15.3).
Peak ground acceleration Shakemap

Peak ground acceleration Shakemap

This map shows the distribution of peak ground acceleration expressed as percent 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 earthquake resentment in the area, expressed in terms of intensity on the MCS scale (Mercalli-Cancani-Sieberg). Intensities are determined using data from questionnaires collected on the website http://www.hsit.it. The intensities shown are determined considering all the reports received from each municipality, and are all the more reliable the greater the number of questionnaires. The collected data are subjected to an automatic statistical filter, but are not checked individually. In particular, intensities greater than or equal to the VI degree of the MCS or EMS scale require on-site verification by specialized personnel. The black star is the epicenter of the earthquake that occurred. This map is updated every time citizens fill out new questionnaires. The number of questionnaires processed to obtain this map, the date and time of the last update are shown at the top right.
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

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

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

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