Earthquake with magnitude of Mwp 6.4 on date 19-01-2021 and time 03:46:21 (Italy) in region San Juan Province, Argentina [Land: Argentina]

A magnitude Mwp 6.4 earthquake occured in region: San Juan Province, Argentina [Land: Argentina], on

  • 19-01-2021 02:46:21 (UTC)
  • 19-01-2021 03:46:21 (UTC +01:00) Italian time
  • 18-01-2021 23:46:21 (UTC -03:00) local time in the region of the earthquake (America/Argentina/San_Juan)

and geographic coordinates (lat, lon) -31.83, -68.67 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 6.4

Mwpd 6.6
2021-01-19
02:46:21
-31.83 -68.67 20 2021-01-19
02:59:45
Sala Sismica INGV-Roma 86367381
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-19 02:46:21
Latitude -31.83
Longitude -68.67
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 86367381

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 8915
Semi-minor axis of confidence ellipse (meter) 755
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 277
Circular confidence region, given by single value of horizontal uncertainty (meter) 7224.3
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 87.1629
Number of associated phases, regardless of their use for origin computation 45
Number of defining phases 45
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 1.61769
Epicentral distance of station closest to the epicenter (degree) 0.28501
Epicentral distance of station farthest from the epicenter (degree) 61.1555
Number of stations at which the event was observed 43
Number of stations from which data was used for origin computation 43
Magnitudes information

Mwpd:6.6

Field Value
Value 6.6
Uncertainty 0.1
Num. used stations 24
Type of magnitude Mwpd
Reference to an origin 86367381
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2021-01-19 02:59:45

Mwp:6.4

Field Value
Value 6.4
Uncertainty 0.1
Num. used stations 29
Type of magnitude Mwp
Reference to an origin 86367381
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2021-01-19 02:59:45

mb:5.7

Field Value
Value 5.7
Uncertainty 0.1
Num. used stations 27
Type of magnitude mb
Reference to an origin 86367381
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2021-01-19 02:59:45
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IU.DWPF.BHZ.00 2021-01-19T02:56:37.02 10.0 negative automatic pP 347 61.1555 -2.98183 0
IU.DWPF.BHZ.00 2021-01-19T02:56:31.82 10.0 positive automatic P 347 61.1555 -1.89342 0
IU.TEIG.BHZ.00 2021-01-19T02:55:51.42 10.0 positive automatic P 337 55.3394 -1.62669 0.480762
CU.GRTK.BHZ.00 2021-01-19T02:55:37.92 10.0 positive automatic P 357 53.3915 -0.954985 0.488118
GE.SNAA.BHZ. 2021-01-19T02:55:33.11 10.0 positive automatic P 159 52.4068 1.36869 0.52719
CU.GTBY.BHZ.00 2021-01-19T02:55:28.17 10.0 negative automatic P 352 52.1213 -1.3262 0.538232
CU.SDDR.BHZ.00 2021-01-19T02:55:18.58 10.0 positive automatic P 357 50.8721 -1.65913 0.521311
CU.MTDJ.BHZ.00 2021-01-19T02:55:18.30 10.0 positive automatic P 349 50.7702 -1.22071 0.255707
IU.SJG.BHZ.00 2021-01-19T02:55:10.00 10.0 positive automatic P 3 49.996 -2.58289 0.529163
CU.ANWB.BHZ.00 2021-01-19T02:55:09.92 10.0 positive automatic P 9 49.9357 -3.13423 0
CU.TGUH.BHZ.00 2021-01-19T02:55:07.15 10.0 negative automatic P 336 49.2274 -0.701325 0.586931
IU.TRIS.BHZ.00 2021-01-19T02:54:55.27 10.0 negative automatic sP 113 46.0934 4.00091 0
GE.BOAB.BHZ. 2021-01-19T02:54:50.95 10.0 positive automatic P 337 47.1758 -0.9256 0.574299
CU.BBGH.BHZ.00 2021-01-19T02:54:48.18 10.0 negative automatic pP 12 45.8128 0.9029 0
II.JTS.BHZ.00 2021-01-19T02:54:34.50 10.0 negative automatic P 337 44.908 0.498916 0.640395
G.HDC.BHZ.00 2021-01-19T02:54:31.25 10.0 positive automatic P 338 44.3619 1.46621 0.635291
CU.GRGR.BHZ.00 2021-01-19T02:54:29.60 10.0 positive automatic P 10 44.4725 -0.903444 0.655725
IU.SDV.BHZ.00 2021-01-19T02:53:58.27 10.0 positive automatic P 357 40.7557 -2.2788 0.707521
IU.RCBR.BHZ.00 2021-01-19T02:53:56.67 10.0 negative automatic P 57 40.1598 1.26099 0.744212
G.MPG.BHZ.00 2021-01-19T02:53:53.40 10.0 negative automatic P 25 39.9705 -0.393889 0.654377
IU.PAYG.BHZ.00 2021-01-19T02:53:31.00 10.0 positive automatic P 323 37.245 1.06344 0.773729
II.RPN.BHZ.00 2021-01-19T02:53:17.57 10.0 negative automatic P 267 35.501 1.56061 0.817111
IU.OTAV.BHZ.00 2021-01-19T02:52:58.97 10.0 positive automatic P 342 33.3743 0.77974 0.860043
IU.PMSA.BHZ.00 2021-01-19T02:52:55.42 10.0 positive automatic P 176 33.0665 0.516721 0.846658
BL.PMNB.HHZ. 2021-01-19T02:51:35.51 10.0 negative automatic P 62 24.0305 1.09122 0.961538
C.GO10.BHZ. 2021-01-19T02:51:07.43 10.0 positive automatic P 184 21.3921 0.283079 0.987654
II.NNA.BHZ.00 2021-01-19T02:51:05.22 10.0 positive automatic P 337 21.2193 -0.0434326 0.952381
II.EFI.BHZ.00 2021-01-19T02:51:04.80 10.0 positive automatic P 162 21.3125 -1.39427 0.888889
C1.MG02.BHZ. 2021-01-19T02:51:01.43 10.0 positive automatic P 181 20.9532 -0.889058 0.43956
G.SPB.BHZ.00 2021-01-19T02:50:59.70 10.0 negative automatic P 72 20.4855 2.3515 0.909091
GT.LPAZ.BHZ.00 2021-01-19T02:49:57.48 10.0 positive automatic P 2 15.5497 -2.03698 0.963855
G.COYC.BHZ.00 2021-01-19T02:49:34.40 10.0 positive automatic P 190 13.9932 -3.40512 0.869565
GT.CPUP.BHZ.00 2021-01-19T02:49:02.20 10.0 negative automatic P 64 11.3267 0.838674 0.898876
C1.LL02.BHZ. 2021-01-19T02:49:02.93 10.0 positive automatic P 192 11.6327 -2.66209 0.808081
GT.PLCA.BHZ.00 2021-01-19T02:48:31.15 10.0 positive automatic P 189 9.0288 1.10936 0.963855
C1.VA04.BHZ. 2021-01-19T02:48:23.85 10.0 negative automatic P 255 8.7281 -1.90892 0.43956
C.GO06.BHZ. 2021-01-19T02:48:17.20 10.0 positive automatic P 196 8.0777 0.166156 0.97561
C.GO05.BHZ. 2021-01-19T02:47:23.30 10.0 positive automatic P 220 4.1817 -0.0256943 0.91954
C1.BO02.BHZ. 2021-01-19T02:47:15.00 10.0 positive automatic P 210 3.4453 2.65546 0.952381
IU.LCO.BHZ.00 2021-01-19T02:47:13.77 10.0 positive automatic P 328 3.3165 1.96105 0.97561
C.GO04.BHZ. 2021-01-19T02:47:01.75 10.0 negative automatic P 312 2.4625 1.71834 0.952381
G.PEL.BHZ.00 2021-01-19T02:46:55.80 10.0 negative automatic P 232 2.1379 0.475439 0.930233
C1.CO02.BHZ. 2021-01-19T02:46:54.13 10.0 negative automatic P 287 2.0792 -0.475787 0.97561
WA.ZON.HHZ. 2021-01-19T02:46:28.51 10.0 positive automatic P 358 0.285 1.33662 0.49505
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