Earthquake with magnitude of Mwp 6.0 on date 25-11-2020 and time 23:56:06 (Italy) in region Balleny Islands region [Sea]

A magnitude Mwp 6.0 earthquake occured in region: Balleny Islands region [Sea], on

  • 25-11-2020 22:56:06 (UTC)
  • 25-11-2020 23:56:06 (UTC +01:00) Italian time
  • 26-11-2020 08:56:06 (UTC +10:00) local time in the region of the earthquake (Antarctica/DumontDUrville)

and geographic coordinates (lat, lon) -62.19, 155.04 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

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 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 ( 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
mb 5.2
Mwp 6.0

Mwpd 5.9
-62.19 155.04 20 2020-11-25
Sala Sismica INGV-Roma 85019641
Preferred location and magnitude until now.
Origin information


Field Value
Time (UTC) 2020-11-25 22:56:06
Latitude -62.19
Longitude 155.04
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 85019641


Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 23251
Semi-minor axis of confidence ellipse (meter) 11645
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 229
Circular confidence region, given by single value of horizontal uncertainty (meter) 19823.4
Confidence level of the uncertainty (%) 68


Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 131.373
Number of associated phases, regardless of their use for origin computation 22
Number of defining phases 22
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 1.75338
Epicentral distance of station closest to the epicenter (degree) 15.47882
Epicentral distance of station farthest from the epicenter (degree) 80.70024
Number of stations at which the event was observed 22
Number of stations from which data was used for origin computation 22
Magnitudes information


Field Value
Value 5.9
Uncertainty 0.1
Num. used stations 2
Type of magnitude Mwpd
Reference to an origin 85019641
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2020-11-25 23:11:15


Field Value
Value 6
Uncertainty 0.1
Num. used stations 6
Type of magnitude Mwp
Reference to an origin 85019641
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2020-11-25 23:11:15


Field Value
Value 5.2
Uncertainty 0.1
Num. used stations 16
Type of magnitude mb
Reference to an origin 85019641
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2020-11-25 23:11:15
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
GT.BOSA.BHZ.00 2020-11-25T23:08:20.33 10.0 positive automatic pP 223 80.7002 -2.65864 0
AF.ALKP.BHZ. 2020-11-25T23:08:18.97 10.0 positive automatic pP 220 80.3918 -2.32534 0
MY.KUM.BHZ. 2020-11-25T23:08:07.17 10.0 positive automatic P 304 79.1062 -0.519627 0.179171
GT.PLCA.BHZ.00 2020-11-25T23:07:24.00 10.0 negative automatic pP 145 70.7409 -1.8893 0
GE.FAKI.BHZ. 2020-11-25T23:06:20.02 10.0 positive automatic P 334 61.6649 -1.11107 0.370285
G.SANVU.BHZ.00 2020-11-25T23:04:37.00 10.0 positive automatic P 16 47.5313 -1.5414 0.594968
GE.SNAA.BHZ. 2020-11-25T23:04:25.11 10.0 positive automatic P 190 45.2713 -1.93459 0
IU.CTAO.BHZ.00 2020-11-25T23:03:57.60 10.0 positive automatic P 348 42.5387 -1.30015 0.548871
AU.MORW.BHZ. 2020-11-25T23:03:51.92 10.0 negative automatic P 304 41.6989 -0.112513 0.723523
ND.MARNC.BHZ.00 2020-11-25T23:03:51.10 10.0 negative automatic P 18 41.6754 -0.69538 0.682838
AU.EIDS.BHZ. 2020-11-25T23:03:10.15 10.0 positive automatic P 354 36.9167 -1.94325 0.837878
AU.ARMA.BHZ. 2020-11-25T23:02:28.02 10.0 positive automatic P 354 31.8491 -0.351344 0.86148
AU.HTT.BHZ. 2020-11-25T23:02:16.90 10.0 negative automatic P 333 30.5321 0.194092 0.929973
NZ.URZ.HHZ.10 2020-11-25T23:01:51.60 10.0 positive automatic P 40 27.4761 2.15932 0.930233
G.CAN.BHZ.00 2020-11-25T23:01:46.35 10.0 negative automatic P 349 27.1384 -0.161299 0.930233
AU.MILA.BHZ.00 2020-11-25T23:01:30.13 10.0 positive automatic P 349 25.3989 -0.685084 0.91954
NZ.KHZ.HHZ.10 2020-11-25T23:01:04.68 10.0 positive automatic P 38 22.5964 0.821561 0.787402
II.TAU.BHZ.00 2020-11-25T23:00:33.37 10.0 positive automatic P 343 19.8108 -0.503907 0.952381
IU.CASY.BHZ.00 2020-11-25T23:00:32.37 10.0 positive automatic P 238 19.3282 3.78754 0.888889
NZ.ODZ.HHZ.10 2020-11-25T23:00:30.97 10.0 negative automatic P 35 19.3688 1.89811 0.943396
IU.SBA.BHZ.00 2020-11-25T22:59:49.05 10.0 positive automatic P 171 16.0858 -0.541433 0.909091
GT.VNDA.BHZ.00 2020-11-25T22:59:39.75 10.0 positive automatic P 174 15.4788 -1.98324 0.816327
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download