Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 20-01-2021 and time 16:56:23 (Italy) in region 4 km NW Visso (MC)

A magnitude ML 1.6 earthquake occured in region: 4 km NW Visso (MC), on

  • 20-01-2021 15:56:23 (UTC)
  • 20-01-2021 16:56:23 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.9540, 13.0560 at 10 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Visso MC 4 1107 1107
Monte Cavallo MC 6 145 1252
Ussita MC 7 444 1696
Preci PG 8 724 2420
Fiordimonte MC 10 202 2622
Pieve Torina MC 10 1458 4080
Castelsantangelo sul Nera MC 10 281 4361
Fiastra MC 12 559 4920
Pievebovigliana MC 12 866 5786
Sellano PG 13 1079 6865
Acquacanina MC 13 121 6986
Muccia MC 14 915 7901
Bolognola MC 15 142 8043
Serravalle di Chienti MC 16 1070 9113
Norcia PG 18 4957 14070
Cerreto di Spoleto PG 19 1075 15145

Municipalities with at least 50000 inhabitants

An earthquake occurred to
29 Km E of Foligno (57155 inhabitants)
55 Km NE of Terni (111501 inhabitants)
57 Km E of Perugia (166134 inhabitants)
62 Km NW of Teramo (54892 inhabitants)
73 Km NW of L'Aquila (69753 inhabitants)
83 Km SW of Ancona (100861 inhabitants)
98 Km NE of Viterbo (67173 inhabitants)
99 Km S of Fano (60888 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000 		ML 1.6 2021-01-20
15:56:23		 42.9538 13.0562 10 2021-07-12
16:55:01		 Bollettino Sismico Italiano INGV 87946001
Reviewed
Rev100 		ML 1.6 2021-01-20
15:56:23		 42.957 13.0637 11 2021-01-20
16:02:10		 Sala Sismica INGV-Roma 86403431
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-20 15:56:23 ± 0.04
Latitude 42.9538 ± 0.0027
Longitude 13.0562 ± 0.0037
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 87946001

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 347
Semi-minor axis of confidence ellipse (meter) 240
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 61
Circular confidence region, given by single value of horizontal uncertainty (meter) 350.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 43
Number of associated phases, regardless of their use for origin computation 55
Number of defining phases 55
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.25
Epicentral distance of station closest to the epicenter (degree) 0.00989
Epicentral distance of station farthest from the epicenter (degree) 0.74194
Number of stations at which the event was observed 33
Number of stations from which data was used for origin computation 33
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations 44
Type of magnitude ML
Reference to an origin 87946001
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-05-30 07:48:30

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations 44
Type of magnitude ML
Reference to an origin 86403431
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-01-20 16:02:10
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.NARO.HHZ. 2021-01-20T15:56:37.82 0.6 undecidable manual P 332 82.3509 50 0.05 44
IV.SMA1.EHZ. 2021-01-20T15:56:37.60 0.3 undecidable manual S 148 42.4242 50 0.07 71
IV.T1299.HNN. 2021-01-20T15:56:37.20 0.6 undecidable manual S 152 39.9267 50 0.34 45
IV.EL6.EHZ. 2021-01-20T15:56:37.90 0.6 undecidable manual S 5 41.8248 50 0.54 43
IV.PIEI.HHZ. 2021-01-20T15:56:37.04 0.3 undecidable manual P 327 77.0673 50 0.09 67
IV.ATCC.EHZ. 2021-01-20T15:56:37.80 0.3 undecidable manual S 307 42.4242 50 0.29 68
IV.LNSS.HHZ. 2021-01-20T15:56:36.50 0.6 undecidable manual S 182 38.9277 50 -0.09 48
IV.FRON.EHZ. 2021-01-20T15:56:35.44 0.3 undecidable manual P 337 67.9764 50 -0.12 67
IV.MF5.EHZ. 2021-01-20T15:56:35.90 0.6 undecidable manual S 83 32.9448 50 0.9 37
IV.MTRA.EHZ. 2021-01-20T15:56:35.40 0.6 undecidable manual S 128 35.2425 50 -0.21 47
IV.ASSB.HHZ. 2021-01-20T15:56:35.00 0.6 undecidable manual S 287 33.744 50 -0.19 47
IV.SAP2.EHE. 2021-01-20T15:56:35.60 0.3 undecidable manual S 60 32.0457 50 0.86 57
IV.GAVE.EHZ. 2021-01-20T15:56:34.50 0.3 undecidable manual S 204 31.8459 50 -0.2 71
IV.ARVD.HHZ. 2021-01-20T15:56:34.47 0.3 undecidable manual P 351 61.0944 50 -0.02 70
IV.TERO.HHZ. 2021-01-20T15:56:33.85 0.3 undecidable manual P 129 57.7977 50 -0.13 69
IV.MDAR.HNN. 2021-01-20T15:56:33.50 0.3 undecidable manual S 15 27.4503 50 -0.01 74
IV.SSFR.HHZ. 2021-01-20T15:56:33.99 0.3 undecidable manual P 338 57.8976 50 -0.01 70
IV.MOMA.HHZ. 2021-01-20T15:56:32.05 0.3 undecidable manual P 247 42.8238 50 0.37 67
IV.SEF1.HNN. 2021-01-20T15:56:32.00 0.3 undecidable manual S 338 23.1546 114 -0.33 70
IV.MNTT.EHZ. 2021-01-20T15:56:32.96 0.3 undecidable manual P 74 45.4212 50 0.89 55
IV.PF6.EHN. 2021-01-20T15:56:32.00 0.3 undecidable manual S 29 23.2545 114 -0.38 69
IV.RM33.EHZ. 2021-01-20T15:56:32.58 0.3 undecidable manual P 165 51.0156 50 -0.36 66
IV.GUMA.HHZ. 2021-01-20T15:56:32.40 0.6 undecidable manual S 62 25.6521 50 -0.64 42
IV.ATCC.EHZ. 2021-01-20T15:56:31.60 0.3 undecidable manual P 307 42.4242 50 -0.01 72
IV.T1299.HNN. 2021-01-20T15:56:31.17 0.3 undecidable manual P 152 39.9267 50 -0.06 72
IV.SMA1.EHZ. 2021-01-20T15:56:31.44 0.3 undecidable manual P 148 42.4242 50 -0.18 70
IV.MMO1.EHZ. 2021-01-20T15:56:31.90 0.6 undecidable manual S 105 22.755 114 -0.33 47
IV.FOSV.EHZ. 2021-01-20T15:56:31.92 0.3 undecidable manual P 328 44.7219 50 -0.05 71
IV.EL6.EHZ. 2021-01-20T15:56:31.44 0.1 undecidable manual P 5 41.8248 50 -0.08 95
IV.MTRA.EHZ. 2021-01-20T15:56:30.30 0.3 undecidable manual P 128 35.2425 50 -0.21 70
IV.CSP1.EHZ. 2021-01-20T15:56:30.80 0.3 undecidable manual S 38 19.4694 118 -0.39 70
IV.LNSS.HHZ. 2021-01-20T15:56:30.85 0.1 undecidable manual P 182 38.9277 50 -0.23 93
IV.ASSB.HHZ. 2021-01-20T15:56:30.17 0.1 undecidable manual P 287 33.744 50 -0.1 96
IV.SAP2.EHE. 2021-01-20T15:56:30.27 0.3 undecidable manual P 60 32.0457 50 0.26 70
IV.MF5.EHZ. 2021-01-20T15:56:30.54 0.3 undecidable manual P 83 32.9448 50 0.38 68
IV.GAVE.EHZ. 2021-01-20T15:56:29.88 0.1 undecidable manual P 204 31.8459 50 -0.11 96
IV.NRCA.HNZ. 2021-01-20T15:56:29.50 0.3 undecidable manual S 160 14.1747 126 -0.11 74
IV.CESI.HHZ. 2021-01-20T15:56:29.60 0.3 undecidable manual S 295 13.5753 127 0.16 74
IV.MDAR.HNN. 2021-01-20T15:56:29.17 0.1 undecidable manual P 15 27.4503 50 -0.13 97
IV.MC2.EHZ. 2021-01-20T15:56:29.20 0.6 undecidable manual S 114 11.7771 131 0.23 49
IV.FIU1.HNZ. 2021-01-20T15:56:29.04 0.6 undecidable manual P 339 27.9498 50 -0.34 46
IV.FDMO.HHZ. 2021-01-20T15:56:28.30 0.6 undecidable manual S 15 9.4794 137 -0.1 50
IV.CSP1.EHZ. 2021-01-20T15:56:28.02 0.1 positive manual P 38 19.4694 118 0.06 99
IV.SEF1.HNN. 2021-01-20T15:56:28.56 0.1 undecidable manual P 338 23.1546 114 -0.06 99
IV.MMO1.EHZ. 2021-01-20T15:56:28.46 0.1 positive manual P 105 22.755 114 -0.1 98
IV.GUMA.HHZ. 2021-01-20T15:56:28.27 0.1 positive manual P 62 25.6521 50 -0.76 81
IV.PF6.EHN. 2021-01-20T15:56:28.47 0.1 undecidable manual P 29 23.2545 114 -0.18 96
IT.MTCL.HGZ. 2021-01-20T15:56:27.60 0.3 undecidable manual S 314 6.3936 148 -0.14 75
IV.NRCA.HNZ. 2021-01-20T15:56:27.12 0.1 positive manual P 160 14.1747 126 0.07 100
IV.FEMA.HNZ. 2021-01-20T15:56:27.30 0.3 undecidable manual S 330 1.0989 174 0.18 75
IV.CESI.HHZ. 2021-01-20T15:56:27.18 0.1 negative manual P 295 13.5753 127 0.23 97
IV.MC2.EHZ. 2021-01-20T15:56:26.90 0.1 undecidable manual P 114 11.7771 131 0.22 97
IV.FDMO.HHZ. 2021-01-20T15:56:26.52 0.1 undecidable manual P 15 9.4794 137 0.17 99
IT.MTCL.HGZ. 2021-01-20T15:56:26.16 0.1 negative manual P 314 6.3936 148 0.19 99
IV.FEMA.HNZ. 2021-01-20T15:56:25.93 0.1 negative manual P 330 1.0989 174 0.32 97
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FEMA.HNN. ML:1.7 0.000986 0.74 AML other m 2021-01-20T15:56:27.72
IV.FEMA.HNE. ML:1.7 0.0010049999999999998 0.32 AML other m 2021-01-20T15:56:27.65
IV.FDMO.HHN. ML:1.8 0.0008265 0.16 AML other m 2021-01-20T15:56:28.47
IV.FDMO.HHE. ML:1.9 0.0010535000000000002 0.16 AML other m 2021-01-20T15:56:28.74
IV.CESI.HHE. ML:1.9 0.0008 0.1 AML other m 2021-01-20T15:56:29.72
IV.CESI.HNE. ML:1.9 0.0008025 0.1 AML other m 2021-01-20T15:56:29.67
IV.CESI.HHN. ML:1.9 0.000862 0.28 AML other m 2021-01-20T15:56:29.81
IV.CESI.HNN. ML:1.9 0.0007909999999999999 1.5 AML other m 2021-01-20T15:56:29.81
IV.NRCA.HHN. ML:2.0 0.001053 0.62 AML other m 2021-01-20T15:56:29.62
IV.NRCA.HHE. ML:1.8 0.0007289999999999999 0.2 AML other m 2021-01-20T15:56:30.69
IV.CSP1.EHN. ML:2.1 0.0009595000000000001 0.42 AML other m 2021-01-20T15:56:31.25
IV.CSP1.EHE. ML:2.0 0.0008535 0.32 AML other m 2021-01-20T15:56:31.87
IV.GUMA.HHE. ML:1.9 0.000523 0.28 AML other m 2021-01-20T15:56:32.72
IV.GUMA.HHN. ML:1.6 0.000242 1.32 AML other m 2021-01-20T15:56:33.85
IV.GAVE.EHE. ML:1.7 0.00024249999999999999 1.52 AML other m 2021-01-20T15:56:35.08
IV.GAVE.EHN. ML:1.6 0.00019600000000000002 0.54 AML other m 2021-01-20T15:56:35.22
IV.ASSB.HHN. ML:1.6 0.00017999999999999998 0.22 AML other m 2021-01-20T15:56:35.31
IV.ASSB.HHE. ML:1.6 0.00017449999999999999 1.1 AML other m 2021-01-20T15:56:35.25
IV.MTRA.EHE. ML:1.6 0.00018099999999999998 1.46 AML other m 2021-01-20T15:56:36.11
IV.MTRA.EHN. ML:1.8 0.0002535 0.96 AML other m 2021-01-20T15:56:36.15
IV.LNSS.HHE. ML:1.4 0.00009795 0.14 AML other m 2021-01-20T15:56:37.51
IV.LNSS.HHN. ML:1.4 0.00009145 0.2 AML other m 2021-01-20T15:56:37.57
IV.ATCC.EHN. ML:1.4 0.00008405 0.9 AML other m 2021-01-20T15:56:38.67
IV.ATCC.EHE. ML:1.4 0.0000859 1.24 AML other m 2021-01-20T15:56:38.13
IV.MOMA.HHN. ML:1.2 0.00004675 0.84 AML other m 2021-01-20T15:56:38.86
IV.EL6.EHE. ML:1.6 0.00013700000000000002 0.18 AML other m 2021-01-20T15:56:38.91
IV.FOSV.EHE. ML:1.3 0.0000612 0.88 AML other m 2021-01-20T15:56:39.63
IV.FOSV.EHN. ML:1.4 0.00007250000000000001 0.24 AML other m 2021-01-20T15:56:39.34
IV.MOMA.HHE. ML:1.3 0.00006405 1.38 AML other m 2021-01-20T15:56:39.25
IV.SMA1.EHE. ML:1.3 0.00006445 1.02 AML other m 2021-01-20T15:56:40.87
IV.EL6.EHN. ML:1.5 0.00009735 1.42 AML other m 2021-01-20T15:56:40.11
IV.RM33.EHN. ML:1.1 0.0000332 1.32 AML other m 2021-01-20T15:56:41.07
IV.TERO.HHE. ML:1.3 0.0000405 0.14 AML other m 2021-01-20T15:56:42.37
IV.RM33.EHE. ML:1.2 0.00004475 0.54 AML other m 2021-01-20T15:56:42.20
IV.SMA1.EHN. ML:1.3 0.0000582 0.38 AML other m 2021-01-20T15:56:42.75
IV.MNTT.EHN. ML:1.7 0.000157 0.9 AML other m 2021-01-20T15:56:42.46
IV.MNTT.EHE. ML:2.0 0.000331 1.84 AML other m 2021-01-20T15:56:44.00
IV.SSFR.HHN. ML:1.6 0.00008219999999999999 1.2 AML other m 2021-01-20T15:56:44.13
IV.TERO.HHN. ML:1.3 0.0000385 0.42 AML other m 2021-01-20T15:56:44.11
IV.ARVD.HHE. ML:1.1 0.000027049999999999997 1.54 AML other m 2021-01-20T15:56:44.02
IV.SSFR.HHE. ML:1.6 0.0000808 0.16 AML other m 2021-01-20T15:56:45.13
IV.FRON.EHE. ML:1.2 0.00002655 0.9 AML other m 2021-01-20T15:56:45.48
IV.ARVD.HHN. ML:1.2 0.0000302 1 AML other m 2021-01-20T15:56:46.61
IV.FRON.EHN. ML:1.4 0.0000394 1.16 AML other m 2021-01-20T15:56:48.16
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