Earthquake with magnitude of Mwp 6.9 on date 24-01-2021 and time 00:36:55 (Italy) in region Antarctica [Sea]

A magnitude Mwp 6.9 earthquake occured in region: Antarctica [Sea], on

  • 23-01-2021 23:36:55 (UTC)
  • 24-01-2021 00:36:55 (UTC +01:00) Italian time
  • 23-01-2021 20:36:55 (UTC -03:00) local time in the region of the earthquake (Antarctica/Palmer)

and geographic coordinates (lat, lon) -61.67, -55.5 at 20 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
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled 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 5.7
Mwp 6.9

Mwpd 7.0
2021-01-23
23:36:55
-61.67 -55.5 20 2021-01-23
23:53:27
Sala Sismica INGV-Roma 86509891
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-23 23:36:55
Latitude -61.67
Longitude -55.50
Depth (km) 20 (from location)
Evaluation mode of Origin automatic
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV-A
Event type earthquake
Origin ID 86509891

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 16665
Semi-minor axis of confidence ellipse (meter) 2147
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 250
Circular confidence region, given by single value of horizontal uncertainty (meter) 13496.7
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 61.5062
Number of associated phases, regardless of their use for origin computation 73
Number of defining phases 73
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 1.58542
Epicentral distance of station closest to the epicenter (degree) 4.9402
Epicentral distance of station farthest from the epicenter (degree) 88.13532
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:7

Field Value
Value 7
Uncertainty 0.1
Num. used stations 42
Type of magnitude Mwpd
Reference to an origin 86509891
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2021-01-23 23:53:27

Mwp:6.9

Field Value
Value 6.9
Uncertainty 0.1
Num. used stations 44
Type of magnitude Mwp
Reference to an origin 86509891
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2021-01-23 23:53:27

mb:5.7

Field Value
Value 5.7
Uncertainty 0.1
Num. used stations 43
Type of magnitude mb
Reference to an origin 86509891
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2021-01-23 23:53:27
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
G.UNM.BHZ.00 2021-01-23T23:49:44.85 10.0 negative automatic PcP 319 88.1353 -0.615573 0
AU.FORT.BHZ.00 2021-01-23T23:49:39.65 10.0 negative automatic P 183 87.501 -0.682343 0.11335
IU.NWAO.BHZ.00 2021-01-23T23:49:28.42 10.0 negative automatic P 174 85.2136 -0.704106 0
IU.TEIG.BHZ.00 2021-01-23T23:49:29.32 10.0 positive automatic P 329 85.9799 -3.55596 0.12219
AU.HTT.BHZ. 2021-01-23T23:49:23.25 10.0 negative automatic P 192 84.1767 -0.707995 0.133428
CU.GRTK.BHZ.00 2021-01-23T23:49:20.90 10.0 positive automatic P 345 84.1207 -2.65277 0.14204
CU.GTBY.BHZ.00 2021-01-23T23:49:18.22 10.0 negative automatic P 341 83.0907 -0.0557043 0.0680054
CU.MTDJ.BHZ.00 2021-01-23T23:49:09.65 10.0 positive automatic P 339 81.8048 -2.05529 0.156697
G.RER.BHZ.00 2021-01-23T23:49:08.05 10.0 positive automatic P 118 80.9276 1.00948 0.151976
CU.SDDR.BHZ.00 2021-01-23T23:49:07.08 10.0 positive automatic P 345 81.6316 -3.66353 0.146182
G.CAN.BHZ.00 2021-01-23T23:49:07.30 10.0 negative automatic P 200 80.9905 -0.0511393 0.169923
CU.ANWB.BHZ.00 2021-01-23T23:49:01.10 10.0 positive automatic P 354 79.4947 1.91539 0.18413
IU.SJG.BHZ.00 2021-01-23T23:49:01.02 10.0 negative automatic P 350 80.229 -2.20581 0.157837
AU.MILA.BHZ.00 2021-01-23T23:48:58.38 10.0 positive automatic P 200 79.2642 0.323443 0.173663
CU.TGUH.BHZ.00 2021-01-23T23:48:57.63 10.0 negative automatic P 329 79.7708 -3.24607 0.081759
GT.DBIC.BHZ.00 2021-01-23T23:48:51.88 10.0 negative automatic P 52 78.6546 -2.71705 0.190042
GE.BOAB.BHZ. 2021-01-23T23:48:46.50 10.0 positive automatic P 330 77.8244 -3.54784 0.186986
GE.VOI.BHZ. 2021-01-23T23:48:42.90 10.0 negative automatic P 111 76.4229 0.598606 0.205088
II.JTS.BHZ.00 2021-01-23T23:48:35.07 10.0 positive automatic P 330 75.5609 -2.17655 0.211328
G.HDC.BHZ.00 2021-01-23T23:48:35.50 10.0 negative automatic P 331 75.0833 0.85144 0.218682
NZ.OUZ.HHZ.10 2021-01-23T23:48:34.89 10.0 negative automatic P 220 75.2934 -0.77106 0.224889
G.FOMA.BHZ.00 2021-01-23T23:48:29.35 10.0 positive automatic P 113 73.8116 2.29526 0.221678
II.TAU.BHZ.00 2021-01-23T23:48:27.17 10.0 positive automatic P 197 73.7994 0.168196 0.237644
CU.GRGR.BHZ.00 2021-01-23T23:48:25.75 10.0 negative automatic P 354 73.9598 -2.21299 0.230417
NZ.URZ.HHZ.10 2021-01-23T23:48:12.77 10.0 negative automatic P 221 71.4058 0.0154662 0.253522
IU.SDV.BHZ.00 2021-01-23T23:48:10.12 10.0 negative automatic P 344 71.5373 -3.6942 0.259787
IU.SNZO.BHZ.00 2021-01-23T23:48:03.15 10.0 positive automatic P 218 69.3324 3.06207 0
NZ.KHZ.HHZ.10 2021-01-23T23:47:55.74 10.0 positive automatic P 217 68.6476 -0.0782642 0.277172
NZ.ODZ.HHZ.10 2021-01-23T23:47:46.94 10.0 negative automatic P 214 67.0061 1.42086 0.294798
IU.PAYG.BHZ.00 2021-01-23T23:47:44.35 10.0 positive automatic P 322 66.4163 2.5928 0.324714
G.MPG.BHZ.00 2021-01-23T23:47:40.55 10.0 positive automatic P 3 66.8148 -3.72837 0.312234
IU.TSUM.BHZ.00 2021-01-23T23:47:32.77 10.0 positive automatic P 85 65.1668 -1.1028 0.3253
IU.OTAV.BHZ.00 2021-01-23T23:47:27.07 10.0 positive automatic P 334 64.3198 -1.66704 0.335915
GT.LBTB.BHZ.00 2021-01-23T23:47:25.05 10.0 negative automatic P 95 63.9703 -0.98239 0.356551
GE.WIN.BHZ. 2021-01-23T23:47:12.65 10.0 negative automatic P 86 62.0307 -0.597599 0.365452
GT.BOSA.BHZ.00 2021-01-23T23:47:03.75 10.0 negative automatic P 97 60.7553 -0.797534 0.386843
AF.ALKP.BHZ. 2021-01-23T23:46:46.66 10.0 negative automatic P 95 58.2188 -0.347959 0.427107
II.SHEL.BHZ.00 2021-01-23T23:46:42.47 10.0 negative automatic P 60 57.5308 0.388061 0.447484
IU.RCBR.BHZ.00 2021-01-23T23:46:42.32 10.0 positive automatic P 23 57.7138 -1.02567 0.424542
II.SUR.BHZ.00 2021-01-23T23:46:28.77 10.0 positive automatic P 95 55.5086 0.872532 0.478169
II.NNA.BHZ.00 2021-01-23T23:46:02.32 10.0 positive automatic P 333 52.0337 0.0578429 0.52087
IU.CASY.BHZ.00 2021-01-23T23:45:59.47 10.0 negative automatic P 173 51.6361 0.27142 0.527215
II.RPN.BHZ.00 2021-01-23T23:45:45.27 10.0 positive automatic P 289 49.4139 2.84355 0.515441
GT.LPAZ.BHZ.00 2021-01-23T23:45:17.90 10.0 positive automatic P 343 46.2623 -0.914727 0.624005
BL.PMNB.HHZ. 2021-01-23T23:44:56.28 10.0 positive automatic P 12 43.5972 -0.658557 0.634253
AU.MAW.BHZ. 2021-01-23T23:44:55.50 10.0 positive automatic P 151 43.284 1.24941 0.654177
GT.VNDA.BHZ.00 2021-01-23T23:44:19.83 10.0 negative automatic P 192 38.9302 1.37377 0.701299
G.SPB.BHZ.00 2021-01-23T23:44:14.55 10.0 positive automatic P 12 38.475 -0.168366 0.777014
IU.SBA.BHZ.00 2021-01-23T23:44:13.35 10.0 negative automatic P 193 38.1305 1.62305 0.756774
GT.CPUP.BHZ.00 2021-01-23T23:43:46.93 10.0 positive automatic P 357 35.3604 -1.21391 0.829587
IU.LCO.BHZ.00 2021-01-23T23:43:37.87 10.0 negative automatic P 336 34.1698 -0.356183 0.281294
C.GO04.BHZ. 2021-01-23T23:43:28.28 10.0 negative automatic P 335 33.0574 -0.241297 0.292251
C1.CO02.BHZ. 2021-01-23T23:43:20.18 10.0 negative automatic P 335 32.0957 0.243157 0.29547
WA.ZON.HHZ. 2021-01-23T23:43:12.87 10.0 positive automatic P 338 31.3202 -0.167547 0.471006
G.PEL.BHZ.00 2021-01-23T23:43:02.90 10.0 positive automatic P 334 30.1471 0.226295 0.886105
C.GO05.BHZ. 2021-01-23T23:42:48.85 10.0 negative automatic P 331 28.6209 -0.186564 0.888889
C1.BO02.BHZ. 2021-01-23T23:42:48.82 10.0 positive automatic P 333 28.575 0.0550446 0.888889
C.GO06.BHZ. 2021-01-23T23:42:07.78 10.0 positive automatic P 329 24.1473 -1.0941 0.720721
GT.PLCA.BHZ.00 2021-01-23T23:41:54.60 10.0 positive automatic P 330 22.8342 -1.32592 0.91954
GE.SNAA.BHZ. 2021-01-23T23:41:48.46 10.0 negative automatic P 138 22.1648 -0.319947 0.930233
C1.LL02.BHZ. 2021-01-23T23:41:35.33 10.0 positive automatic P 325 20.8617 0.614607 0.898876
G.COYC.BHZ.00 2021-01-23T23:41:13.75 10.0 positive automatic P 322 18.7422 2.17569 0.930233
II.HOPE.BHZ.00 2021-01-23T23:39:51.22 10.0 positive automatic P 62 12.4206 1.58366 0.909091
C1.MG02.BHZ. 2021-01-23T23:39:38.83 10.0 negative automatic P 314 11.539 1.23451 0.97561
II.EFI.BHZ.00 2021-01-23T23:39:20.27 10.0 negative automatic P 351 10.0924 2.47395 0.987654
IU.PMSA.BHZ.00 2021-01-23T23:38:05.02 10.0 negative automatic P 227 4.9402 -2.05638 0.952381
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download