Official address: http://terremoti.ingv.it
Earthquake with magnitude of Mwp 6.9 on date 23-01-2021 and time 23:36:55 (UTC) 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.
Display location by
GeoHack
GoogleMap
OpenStreetMap
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
Not available maps for this sismic event.
Seismic hazard
Not available maps for this sismic event.
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
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
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
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
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
Not available TDMT solution for this seismic event.
Focal Mechanism in the area
Not available maps for this sismic event.