Earthquake with magnitude of ML 1.8 on date 20-10-2021 and time 22:32:12 (Italy) in region 3 km E Visso (MC)

A magnitude ML 1.8 earthquake occured in region: 3 km E Visso (MC), on

  • 20-10-2021 20:32:12 (UTC)
  • 20-10-2021 22:32:12 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.923, 13.119 at 9 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

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Visso MC 3 1107 1107
Ussita MC 3 444 1551
Castelsantangelo sul Nera MC 4 281 1832
Preci PG 8 724 2556
Bolognola MC 12 142 2698
Monte Cavallo MC 12 145 2843
Acquacanina MC 13 121 2964
Fiordimonte MC 13 202 3166
Fiastra MC 13 559 3725
Pieve Torina MC 15 1458 5183
Norcia PG 15 4957 10140
Pievebovigliana MC 16 866 11006
Sellano PG 16 1079 12085
Montemonaco AP 17 604 12689
Montefortino FM 18 1178 13867
Muccia MC 19 915 14782
Sarnano MC 20 3264 18046
Montegallo AP 20 523 18569

Municipalities with at least 50000 inhabitants

An earthquake occurred to
34 Km E of Foligno (57155 inhabitants)
56 Km NE of Terni (111501 inhabitants)
56 Km NW of Teramo (54892 inhabitants)
63 Km E of Perugia (166134 inhabitants)
68 Km NW of L'Aquila (69753 inhabitants)
84 Km SW of Ancona (100861 inhabitants)
96 Km W of Montesilvano (53738 inhabitants)
100 Km NE of Viterbo (67173 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
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 earthquake resentment in the area, expressed in terms of intensity on the MCS scale (Mercalli-Cancani-Sieberg). Intensities are determined using data from questionnaires collected on the website http://www.hsit.it. The intensities shown are determined considering all the reports received from each municipality, and are all the more reliable the greater the number of questionnaires. The collected data are subjected to an automatic statistical filter, but are not checked individually. In particular, intensities greater than or equal to the VI degree of the MCS or EMS scale require on-site verification by specialized personnel. The black star is the epicenter of the earthquake that occurred. This map is updated every time citizens fill out new questionnaires. The number of questionnaires processed to obtain this map, the date and time of the last update are shown at the top right.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
ML 1.8 2021-10-20
20:32:12
42.9233 13.1187 9 2021-10-20
20:41:51
Sala Sismica INGV-Roma 96809921
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-20 20:32:12 ± 0.04
Latitude 42.9233 ± 0.0027
Longitude 13.1187 ± 0.0037
Depth (km) 9 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 96809921

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 277
Semi-minor axis of confidence ellipse (meter) 202
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 54
Circular confidence region, given by single value of horizontal uncertainty (meter) 280
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 37
Number of associated phases, regardless of their use for origin computation 58
Number of defining phases 55
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.23
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.7905
Number of stations at which the event was observed 34
Number of stations from which data was used for origin computation 31
Magnitude information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 50
Type of magnitude ML
Reference to an origin 96809921
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-20 20:41:51
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.BRSN.EHZ. 2021-10-20T20:32:59.54 3.0 undecidable manual S -1.97 0
IV.PIEI.HHZ. 2021-10-20T20:32:39.06 3.0 undecidable manual S -0.08 0
IV.ARVD.HHZ. 2021-10-20T20:32:33.70 0.3 undecidable manual S 347 0.5891 50 0.67 58
IV.MURB.HHZ. 2021-10-20T20:32:32.85 0.3 undecidable manual S 308 0.5504 50 0.94 52
IV.ATFO.HHZ. 2021-10-20T20:32:31.08 3.0 undecidable manual S -3.16 0
IV.TERO.HHZ. 2021-10-20T20:32:29.38 0.6 undecidable manual S 130 0.4658 50 -0.01 47
IV.FOSV.EHZ. 2021-10-20T20:32:29.22 0.6 undecidable manual S 325 0.4542 50 0.18 45
IV.ATCC.EHZ. 2021-10-20T20:32:28.69 0.6 undecidable manual S 307 0.4371 50 0.15 46
IV.RM33.EHZ. 2021-10-20T20:32:28.21 0.3 undecidable manual S 170 0.42 50 0.17 68
IV.EL6.EHZ. 2021-10-20T20:32:27.44 0.6 undecidable manual S 358 0.4056 50 -0.19 46
IV.NARO.HHZ. 2021-10-20T20:32:27.69 0.6 negative manual P 331 0.7905 50 -0.17 42
IV.SMA1.EHZ. 2021-10-20T20:32:25.15 0.3 undecidable manual S 151 0.3327 50 -0.31 67
IV.T1299.HNZ. 2021-10-20T20:32:25.22 0.6 undecidable manual S 157 0.313 50 0.35 45
IV.ASSB.HHZ. 2021-10-20T20:32:25.94 0.6 undecidable manual S 290 0.357 50 -0.23 46
IV.ARVD.HHZ. 2021-10-20T20:32:24.45 0.6 undecidable manual P 347 0.5891 50 0.06 45
IV.LNSS.HHZ. 2021-10-20T20:32:24.88 0.3 undecidable manual S 190 0.3256 50 -0.35 67
IV.MURB.HHZ. 2021-10-20T20:32:23.79 0.6 negative manual P 308 0.5504 50 0.04 46
IV.GAVE.EHZ. 2021-10-20T20:32:23.96 0.6 undecidable manual S 216 0.2833 105 0.04 48
IV.MF5.EHZ. 2021-10-20T20:32:23.52 0.6 undecidable manual S 75 0.2572 107 0.57 43
IV.TERO.HHZ. 2021-10-20T20:32:22.05 0.6 negative manual P 130 0.4658 50 -0.25 44
IV.FOSV.EHZ. 2021-10-20T20:32:21.92 1.0 positive manual P 325 0.4542 50 -0.17 23
IV.PF6.EHN. 2021-10-20T20:32:21.08 0.3 undecidable manual S 14 0.2212 109 -0.55 65
IV.MML1.EHZ. 2021-10-20T20:32:21.44 0.6 undecidable manual S 331 0.2185 110 -0.08 48
IV.MNTT.EHZ. 2021-10-20T20:32:21.20 0.1 positive manual P 68 0.375 50 0.46 86
IV.OFFI.HHZ. 2021-10-20T20:32:21.99 0.6 positive manual P 88 0.4155 50 0.56 41
IV.RM33.EHZ. 2021-10-20T20:32:21.20 0.1 undecidable manual P 170 0.42 50 -0.31 89
IV.CING.HHZ. 2021-10-20T20:32:21.91 0.6 positive manual P 7 0.4551 50 -0.21 45
IV.GUMA.HHZ. 2021-10-20T20:32:21.53 0.6 undecidable manual S 49 0.2104 110 0.28 46
IV.ATCC.EHZ. 2021-10-20T20:32:21.64 0.6 positive manual P 307 0.4371 50 -0.16 46
IV.MOMA.HHZ. 2021-10-20T20:32:21.65 0.1 undecidable manual P 254 0.4191 50 0.15 92
IV.ARRO.EHZ. 2021-10-20T20:32:21.58 0.6 positive manual P 217 0.4308 50 -0.12 46
IV.EL6.EHZ. 2021-10-20T20:32:20.91 0.3 negative manual P 358 0.4056 50 -0.37 66
IV.CESI.HHZ. 2021-10-20T20:32:20.21 0.6 undecidable manual S 298 0.1763 114 0.19 48
IV.ASSB.HHZ. 2021-10-20T20:32:20.13 0.1 positive manual P 290 0.357 50 -0.3 90
IV.GAVE.EHZ. 2021-10-20T20:32:19.08 0.1 positive manual P 216 0.2833 105 -0.06 96
IV.MMO1.EHZ. 2021-10-20T20:32:19.07 0.6 undecidable manual S 99 0.1547 117 -0.17 48
IV.LNSS.HHZ. 2021-10-20T20:32:19.60 1.0 negative manual P 190 0.3256 50 -0.29 23
IV.CSP1.EHZ. 2021-10-20T20:32:19.88 0.6 undecidable manual S 20 0.1799 113 -0.25 47
IV.SMA1.EHZ. 2021-10-20T20:32:19.70 0.1 undecidable manual P 151 0.3327 50 -0.32 90
IV.T1299.HNZ. 2021-10-20T20:32:19.66 0.1 undecidable manual P 157 0.313 50 -0.02 96
IV.MF5.EHZ. 2021-10-20T20:32:18.69 0.1 positive manual P 75 0.2572 107 0.11 95
IV.SAP2.EHZ. 2021-10-20T20:32:18.92 0.6 negative manual P 50 0.268 106 0.12 47
IT.MTCL.HGZ. 2021-10-20T20:32:17.73 0.6 undecidable manual S 309 0.1124 125 -0.12 49
IV.NRCA.HNZ. 2021-10-20T20:32:17.40 0.6 undecidable manual S 182 0.0899 131 0.23 48
IV.CESI.HHZ. 2021-10-20T20:32:17.02 0.1 positive manual P 298 0.1763 114 0.14 96
IV.PF6.EHN. 2021-10-20T20:32:17.48 0.1 undecidable manual P 14 0.2212 109 -0.34 92
IV.MML1.EHZ. 2021-10-20T20:32:17.61 0.6 positive manual P 331 0.2185 110 -0.14 48
IV.FDMO.HHZ. 2021-10-20T20:32:17.44 0.6 undecidable manual S 349 0.1151 124 -0.51 45
IV.GUMA.HHZ. 2021-10-20T20:32:17.69 0.1 positive manual P 49 0.2104 110 0.1 96
IV.MC2.EHZ. 2021-10-20T20:32:16.21 0.6 undecidable manual S 103 0.0531 146 0 51
IV.FEMA.HNZ. 2021-10-20T20:32:16.49 0.6 undecidable manual S 308 0.0639 141 0.03 50
IV.MMO1.EHZ. 2021-10-20T20:32:16.43 0.1 positive manual P 99 0.1547 117 0 99
IV.CSP1.EHZ. 2021-10-20T20:32:16.81 0.1 positive manual P 20 0.1799 113 -0.14 96
IV.FDMO.HHZ. 2021-10-20T20:32:15.68 0.1 negative manual P 349 0.1151 124 -0.01 100
IT.MTCL.HGZ. 2021-10-20T20:32:15.75 0.3 positive manual P 309 0.1124 125 0.12 73
IV.NRCA.HNZ. 2021-10-20T20:32:15.50 0.1 undecidable manual P 182 0.0899 131 0.27 95
IV.FEMA.HNZ. 2021-10-20T20:32:15.05 0.1 undecidable manual P 308 0.0639 141 0.22 97
IV.MC2.EHZ. 2021-10-20T20:32:14.84 0.1 negative manual P 103 0.0531 146 0.16 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FEMA.HNE. ML:2.5 0.005205 1.44 AML other m 2021-10-20T20:32:16.19
IV.FEMA.HNN. ML:2.4 0.00415 0.26 AML other m 2021-10-20T20:32:16.94
IV.FDMO.HHN. ML:1.7 0.0006435 1.06 AML other m 2021-10-20T20:32:19.27
IV.FDMO.HHE. ML:1.7 0.0006125 0.16 AML other m 2021-10-20T20:32:19.77
IV.CESI.HHE. ML:2 0.000785 0.46 AML other m 2021-10-20T20:32:20.62
IV.CESI.HHN. ML:2.3 0.001685 0.2 AML other m 2021-10-20T20:32:20.51
IV.CSP1.EHN. ML:2.5 0.00248 0.52 AML other m 2021-10-20T20:32:20.91
IV.CSP1.EHE. ML:2.3 0.00154 1.78 AML other m 2021-10-20T20:32:20.05
IV.GUMA.HHN. ML:2.2 0.001185 1.46 AML other m 2021-10-20T20:32:21.25
IV.GUMA.HNN. ML:2.3 0.001365 0.56 AML other m 2021-10-20T20:32:21.71
IV.TERO.HHE. ML:1.4 6.638544E-5 0.4224 AML other m 2021-10-20T20:32:33.84
IV.MML1.EHE. ML:1.5 0.000193 0.36 AML other m 2021-10-20T20:32:23.56
IV.GAVE.EHN. ML:2.3 0.0008545 0.92 AML other m 2021-10-20T20:32:24.16
IV.GAVE.EHE. ML:2.2 0.0006675 0.4 AML other m 2021-10-20T20:32:24.43
IV.GUMA.HHE. ML:2.3 0.00144 0.48 AML other m 2021-10-20T20:32:24.63
IV.GUMA.HNE. ML:2.2 0.001185 0.46 AML other m 2021-10-20T20:32:24.87
IV.MML1.EHN. ML:1.6 0.0002235 0.54 AML other m 2021-10-20T20:32:24.54
IV.MML1.HNE. ML:1.6 0.0002295 1.6 AML other m 2021-10-20T20:32:24.19
IV.MML1.HNN. ML:1.6 0.0002545 0.78 AML other m 2021-10-20T20:32:25.05
IV.LNSS.HHN. ML:2 0.000385 0.22 AML other m 2021-10-20T20:32:25.68
IV.LNSS.HHE. ML:1.7 0.0002055 0.7 AML other m 2021-10-20T20:32:25.94
IV.ASSB.HHN. ML:1.9 0.000304 0.94 AML other m 2021-10-20T20:32:26.45
IV.SAP2.EHE. ML:1.8 0.000324 0.46 AML other m 2021-10-20T20:32:26.43
IV.SAP2.EHN. ML:2.5 0.00157 1.52 AML other m 2021-10-20T20:32:27.89
IV.MF5.EHN. ML:1.7 0.0002465 0.58 AML other m 2021-10-20T20:32:27.77
IV.ASSB.HHE. ML:1.9 0.0002825 0.16 AML other m 2021-10-20T20:32:27.62
IV.EL6.EHE. ML:1.9 0.00022 0.56 AML other m 2021-10-20T20:32:27.85
IV.MF5.EHE. ML:1.8 0.000328 0.58 AML other m 2021-10-20T20:32:28.06
IV.EL6.EHN. ML:2 0.0003205 0.76 AML other m 2021-10-20T20:32:28.25
IV.RM33.EHN. ML:1.5 9.13E-5 0.32 AML other m 2021-10-20T20:32:29.33
IV.ATCC.EHE. ML:1.8 0.000167 0.34 AML other m 2021-10-20T20:32:29.18
IV.FOSV.EHE. ML:1.5 8.745E-5 0.46 AML other m 2021-10-20T20:32:29.61
IV.FOSV.EHN. ML:1.6 0.0001086 0.24 AML other m 2021-10-20T20:32:29.47
IV.ATCC.EHN. ML:1.8 0.0001775 0.88 AML other m 2021-10-20T20:32:29.20
IV.TERO.HHN. ML:1.6 0.0001063 0.72 AML other m 2021-10-20T20:32:29.58
IV.CING.HHN. ML:1.6 0.0001101 1.86 AML other m 2021-10-20T20:32:29.03
IV.SMA1.EHN. ML:1.5 0.000124 0.56 AML other m 2021-10-20T20:32:29.69
IV.CING.HHE. ML:1.6 0.0001065 0.08 AML other m 2021-10-20T20:32:30.24
IV.MOMA.HHE. ML:2 0.0002685 0.18 AML other m 2021-10-20T20:32:30.59
IV.MOMA.HHN. ML:1.8 0.000173 1.06 AML other m 2021-10-20T20:32:30.73
IV.ARRO.EHE. ML:1.6 0.0001215 0.18 AML other m 2021-10-20T20:32:30.95
IV.RM33.EHE. ML:1.3 5.3E-5 0.26 AML other m 2021-10-20T20:32:31.99
IV.ARRO.EHN. ML:1.4 7.71E-5 0.72 AML other m 2021-10-20T20:32:33.46
IV.MURB.HHE. ML:2.1 0.000257 0.2 AML other m 2021-10-20T20:32:33.55
IV.MURB.HHN. ML:2 0.0002185 0.18 AML other m 2021-10-20T20:32:33.79
IV.SMA1.EHE. ML:1.5 0.000129 0.42 AML other m 2021-10-20T20:32:36.65
IV.ARVD.HHN. ML:1.3 3.53E-5 0.7 AML other m 2021-10-20T20:32:37.05
IV.ARVD.HHE. ML:1.4 5.095E-5 1.3 AML other m 2021-10-20T20:32:37.86
IV.OFFI.HHN. ML:1.7 0.0001405 0.66 AML other m 2021-10-20T20:32:38.30
IV.OFFI.HHE. ML:1.6 0.0001245 0.58 AML other m 2021-10-20T20:32:42.42
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