Earthquake with magnitude of Mwp 6.4 on date 03-04-2021 and time 03:16:39 (Italy) in region East of South Sandwich Islands [Sea]

A magnitude Mwp 6.4 earthquake occured in region: East of South Sandwich Islands [Sea], on

  • 03-04-2021 01:16:39 (UTC)
  • 03-04-2021 03:16:39 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) -57.888, -7.826 at 1 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 6.4

Mwpd 6.5
2021-04-03
01:16:39
-57.8883 -7.8255 1 2021-04-03
01:35:07
Sala Sismica INGV-Roma 88725711
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-03 01:16:39
Latitude -57.8883
Longitude -7.8255
Depth (km) 1 (from location)
Evaluation mode of Origin automatic
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV-A
Event type earthquake
Origin ID 88725711

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 15364
Semi-minor axis of confidence ellipse (meter) 3913
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 171
Circular confidence region, given by single value of horizontal uncertainty (meter) 12639.5
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 47.761
Number of associated phases, regardless of their use for origin computation 67
Number of defining phases 67
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 1.07856
Epicentral distance of station closest to the epicenter (degree) 13.93319
Epicentral distance of station farthest from the epicenter (degree) 94.88492
Number of stations at which the event was observed 66
Number of stations from which data was used for origin computation 66
Magnitudes information

Mwpd:6.5

Field Value
Value 6.5
Uncertainty 0.1
Num. used stations 44
Type of magnitude Mwpd
Reference to an origin 88725711
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2021-04-03 01:35:07

Mwp:6.4

Field Value
Value 6.4
Uncertainty 0.1
Num. used stations 44
Type of magnitude Mwp
Reference to an origin 88725711
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2021-04-03 01:35:07

mb:5.5

Field Value
Value 5.5
Uncertainty 0.1
Num. used stations 61
Type of magnitude mb
Reference to an origin 88725711
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2021-04-03 01:35:07
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IU.TRIS.BHZ.00 2021-04-03T01:32:36.37 10.0 negative automatic ScS 350 21.0281 -14.1933 0
WA.ZON.HHZ. 2021-04-03T01:32:25.75 10.0 positive automatic S 276 48.4121 3.35909 0
AU.EIDS.BHZ. 2021-04-03T01:30:02.45 10.0 negative automatic P 161 94.8849 0.41848 0
GE.EIL.BHZ. 2021-04-03T01:30:01.50 10.0 positive automatic PcP 36 94.5989 0.412092 0
AU.QLP.BHZ. 2021-04-03T01:29:50.55 10.0 positive automatic P 155 92.3413 0.229959 0.07694
II.JTS.BHZ.00 2021-04-03T01:29:47.72 10.0 positive automatic P 286 91.9896 -0.989682 0.0755901
WM.AVE.BHZ. 2021-04-03T01:29:44.60 10.0 positive automatic P 0 91.183 -0.358337 0.0861911
AU.ARMA.BHZ. 2021-04-03T01:29:40.40 10.0 positive automatic P 162 90.0186 0.706822 0.0928794
IU.MBWA.BHZ.00 2021-04-03T01:29:38.07 10.0 positive automatic P 132 89.7919 -0.403681 0.0922473
AU.WRKA.BHZ.00 2021-04-03T01:29:36.48 10.0 positive automatic P 141 89.3482 0.00319892 0.0845368
NZ.OUZ.HHZ.10 2021-04-03T01:29:25.51 10.0 positive automatic P 181 86.8787 0.905851 0.117243
AU.GIRL.BHZ.00 2021-04-03T01:29:22.25 10.0 positive automatic P 128 86.2303 0.813532 0.121678
G.CAN.BHZ.00 2021-04-03T01:29:14.55 10.0 positive automatic P 161 84.7779 0.250487 0.133242
AU.HTT.BHZ. 2021-04-03T01:29:13.30 10.0 positive automatic P 153 84.5072 0.357554 0.135456
AU.FORT.BHZ.00 2021-04-03T01:29:10.38 10.0 positive automatic P 143 83.9369 0.438178 0.138529
NZ.URZ.HHZ.10 2021-04-03T01:29:10.37 10.0 positive automatic P 184 83.7578 1.35729 0.141007
IU.SDV.BHZ.00 2021-04-03T01:29:07.67 10.0 positive automatic P 298 83.7277 -1.45105 0.141931
AU.MILA.BHZ.00 2021-04-03T01:29:06.18 10.0 positive automatic P 162 83.1074 0.391914 0
G.TAM.BHZ.00 2021-04-03T01:28:55.95 10.0 positive automatic P 12 81.4447 -1.23134 0.141545
IU.SNZO.BHZ.00 2021-04-03T01:28:54.95 10.0 positive automatic P 182 80.7768 1.53743 0.171906
AU.MORW.BHZ. 2021-04-03T01:28:54.82 10.0 positive automatic P 133 81.2182 -0.968723 0.14956
IU.NWAO.BHZ.00 2021-04-03T01:28:39.40 10.0 positive automatic P 135 78.2203 -0.126827 0.196671
NZ.ODZ.HHZ.10 2021-04-03T01:28:35.12 10.0 negative automatic P 179 77.0565 2.1129 0.196967
II.TAU.BHZ.00 2021-04-03T01:28:33.82 10.0 positive automatic P 162 77.0872 0.66642 0.193986
G.MPG.BHZ.00 2021-04-03T01:28:05.00 10.0 positive automatic P 313 72.5319 -1.77686 0.211355
II.MSEY.BHZ.00 2021-04-03T01:28:03.97 10.0 positive automatic P 69 72.1166 -0.385781 0.21967
II.NNA.BHZ.00 2021-04-03T01:27:43.67 10.0 positive automatic P 282 68.7662 -0.221369 0.295515
GE.KMBO.BHZ.00 2021-04-03T01:27:34.57 10.0 negative automatic P 50 66.9211 2.06762 0.303844
II.MBAR.BHZ.00 2021-04-03T01:27:19.60 10.0 negative automatic P 44 64.8769 0.359353 0.336546
GT.DBIC.BHZ.00 2021-04-03T01:27:14.90 10.0 negative automatic P 3 64.6006 -2.31147 0.336181
GT.LPAZ.BHZ.00 2021-04-03T01:26:50.63 10.0 negative automatic P 287 60.6358 -0.925724 0.392974
IU.RCBR.BHZ.00 2021-04-03T01:26:20.27 10.0 positive automatic P 326 56.4523 -1.3383 0.38951
II.ABPO.BHZ.00 2021-04-03T01:26:16.82 10.0 positive automatic P 70 55.6733 0.590414 0.443903
GE.VOI.BHZ. 2021-04-03T01:25:56.90 10.0 positive automatic P 71 53.0147 0.103435 0.517391
C1.VA04.BHZ. 2021-04-03T01:25:51.80 10.0 positive automatic P 265 52.1692 1.44229 0.424837
C.GO03.BHZ. 2021-04-03T01:25:51.48 10.0 positive automatic P 277 52.3698 -0.475403 0.540663
IU.LCO.BHZ.00 2021-04-03T01:25:45.32 10.0 positive automatic P 276 51.4816 -0.273934 0.52967
C.GO04.BHZ. 2021-04-03T01:25:38.65 10.0 positive automatic P 275 50.6123 -0.377002 0.563364
C1.CO02.BHZ. 2021-04-03T01:25:33.58 10.0 positive automatic P 274 49.9069 0.048242 0.555238
BL.PMNB.HHZ. 2021-04-03T01:25:22.03 10.0 positive automatic P 308 48.4599 -0.373598 0.553519
WA.ZON.HHZ. 2021-04-03T01:25:21.72 10.0 positive automatic P 276 48.4121 -0.286243 0.542237
G.PEL.BHZ.00 2021-04-03T01:25:20.80 10.0 positive automatic P 273 48.2233 0.268241 0.545204
IU.CASY.BHZ.00 2021-04-03T01:25:17.17 10.0 positive automatic P 151 47.631 1.34629 0.60738
C.GO05.BHZ. 2021-04-03T01:25:14.25 10.0 positive automatic P 270 47.459 -0.255359 0.576085
C1.BO02.BHZ. 2021-04-03T01:25:10.75 10.0 positive automatic P 271 47.0139 -0.425558 0.603781
GT.VNDA.BHZ.00 2021-04-03T01:24:51.30 10.0 positive automatic P 177 44.4405 0.614872 0.648669
IU.SBA.BHZ.00 2021-04-03T01:24:50.67 10.0 negative automatic P 178 44.2196 1.76536 0.652599
C.GO06.BHZ. 2021-04-03T01:24:45.08 10.0 positive automatic P 266 43.8128 -0.771689 0.230684
IU.TSUM.BHZ.00 2021-04-03T01:24:37.72 10.0 positive automatic P 36 42.9419 -1.0973 0.618058
GT.PLCA.BHZ.00 2021-04-03T01:24:34.93 10.0 positive automatic P 266 42.4969 -0.240625 0.653255
II.SHEL.BHZ.00 2021-04-03T01:24:31.17 10.0 negative automatic P 3 41.9559 0.508683 0.648306
C1.LL02.BHZ. 2021-04-03T01:24:26.58 10.0 positive automatic P 262 41.4533 0.0547296 0.719528
GT.LBTB.BHZ.00 2021-04-03T01:24:18.08 10.0 positive automatic P 50 40.5149 -0.844677 0.625668
G.COYC.BHZ.00 2021-04-03T01:24:15.15 10.0 positive automatic P 259 39.9566 1.01942 0.748128
GE.WIN.BHZ. 2021-04-03T01:24:11.35 10.0 positive automatic P 38 39.6216 -0.250451 0.754607
GT.BOSA.BHZ.00 2021-04-03T01:23:50.60 10.0 positive automatic P 52 37.1874 -0.434092 0.702199
G.CRZF.BHZ.00 2021-04-03T01:23:49.75 10.0 positive automatic P 99 36.997 0.531299 0.752568
C.GO10.BHZ. 2021-04-03T01:23:31.40 10.0 negative automatic P 250 34.7703 1.18277 0.777494
AF.ALKP.BHZ. 2021-04-03T01:23:30.05 10.0 negative automatic P 50 34.775 -0.283099 0.851446
AF.GRHM.BHZ. 2021-04-03T01:23:21.87 10.0 negative automatic P 58 33.6633 1.2635 0
II.SUR.BHZ.00 2021-04-03T01:23:07.57 10.0 positive automatic P 50 32.0465 0.91507 0.811882
IU.QSPA.BHZ.00 2021-04-03T01:23:07.07 10.0 positive automatic P 180 32.1733 -0.886875 0.864666
AU.MAW.BHZ. 2021-04-03T01:23:03.95 10.0 positive automatic P 137 31.7786 -0.053651 0.738424
II.EFI.BHZ.00 2021-04-03T01:22:38.60 10.0 positive automatic P 260 28.9153 -0.110322 0.776699
IU.PMSA.BHZ.00 2021-04-03T01:22:22.32 10.0 negative automatic P 232 26.8491 2.1058 0.43956
II.HOPE.BHZ.00 2021-04-03T01:20:28.07 10.0 positive automatic P 270 16.2604 0.285205 0.909091
GE.SNAA.BHZ. 2021-04-03T01:19:54.06 10.0 positive automatic P 173 13.9332 -2.82339 0.930233
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