Earthquake with magnitude of ML 1.6 on date 20-10-2021 and time 22:30:33 (Italy) in region 3 km E Visso (MC)

A magnitude ML 1.6 earthquake occured in region: 3 km E Visso (MC), on

  • 20-10-2021 20:30:33 (UTC)
  • 20-10-2021 22:30:33 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.92, 13.12 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 13 145 2843
Acquacanina MC 13 121 2964
Fiordimonte MC 13 202 3166
Fiastra MC 13 559 3725
Norcia PG 14 4957 8682
Pieve Torina MC 15 1458 10140
Sellano PG 16 1079 11219
Pievebovigliana MC 16 866 12085
Montemonaco AP 17 604 12689
Montefortino FM 18 1178 13867
Muccia MC 19 915 14782
Montegallo AP 20 523 15305
Sarnano MC 20 3264 18569
Cerreto di Spoleto PG 20 1075 19644

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)
67 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 1.6 2021-10-20
20:30:33
42.9205 13.1195 9 2021-10-20
20:38:04
Sala Sismica INGV-Roma 96809721
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-20 20:30:33 ± 0.07
Latitude 42.9205 ± 0.0036
Longitude 13.1195 ± 0.0061
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 96809721

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 435
Semi-minor axis of confidence ellipse (meter) 418
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 47
Circular confidence region, given by single value of horizontal uncertainty (meter) 430
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 74
Number of associated phases, regardless of their use for origin computation 45
Number of defining phases 29
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.27
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.43887
Number of stations at which the event was observed 30
Number of stations from which data was used for origin computation 15
Magnitude information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.4
Num. used stations 20
Type of magnitude ML
Reference to an origin 96809721
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-20 20:38:04
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.MILN.HNZ. 2021-10-20T20:32:37.29 3.0 undecidable manual Sg 14.91 0
GU.GORR.HHZ. 2021-10-20T20:32:23.01 3.0 undecidable manual Sg 15.67 0
MN.CLTB.HHZ. 2021-10-20T20:32:21.51 3.0 undecidable manual Sn 1.25 0
IV.LPDG.HHZ. 2021-10-20T20:32:19.31 3.0 positive manual Pg 23.120001 0
IV.ILOS.HHZ. 2021-10-20T20:32:18.39 3.0 undecidable manual Sg 15.57 0
IV.BOZZ.HNZ. 2021-10-20T20:32:13.21 3.0 undecidable manual Sg 11.85 0
AC.VLO.HHZ. 2021-10-20T20:31:51.60 3.0 undecidable manual Pg 20.35 0
OX.ACOM.HHZ. 2021-10-20T20:31:34.13 3.0 negative manual Pg 7.38 0
IV.ILOS.HHZ. 2021-10-20T20:31:30.19 3.0 positive manual Pg 12.44 0
IV.OSSC.HHZ. 2021-10-20T20:31:27.53 3.0 undecidable manual Sg 3.6 0
IV.FIR.HHZ. 2021-10-20T20:31:26.63 3.0 undecidable manual Sn -1.26 0
IV.SPS2.HHZ. 2021-10-20T20:31:26.78 3.0 positive manual Pg 12.87 0
IV.SGAL.EHZ. 2021-10-20T20:31:22.15 3.0 undecidable manual Pn -0.82 0
IX.NSC3.EHZ.02 2021-10-20T20:31:12.68 3.0 undecidable manual Sn 0.52 0
IV.ATCC.EHZ. 2021-10-20T20:30:50.46 0.6 undecidable manual S 307 0.4389 50 0.66 40
IV.ASSB.HHZ. 2021-10-20T20:30:47.57 0.6 undecidable manual S 290 0.3579 50 0.16 47
IV.LNSS.HHZ. 2021-10-20T20:30:46.40 0.6 undecidable manual S 190 0.3229 50 0.04 49
IV.SMA1.EHZ. 2021-10-20T20:30:46.86 0.3 undecidable manual S 151 0.3301 50 0.28 69
IV.MF5.EHZ. 2021-10-20T20:30:45.05 0.6 undecidable manual S 75 0.2581 108 0.7 41
IV.GAVE.EHZ. 2021-10-20T20:30:45.28 0.3 undecidable manual S 216 0.2815 50 0.14 72
IV.TERO.HHZ. 2021-10-20T20:30:44.11 3.0 undecidable manual S 4.51 0
IV.MML1.EHZ. 2021-10-20T20:30:43.13 0.6 undecidable manual S 331 0.2212 111 0.12 49
IV.ATCC.EHZ. 2021-10-20T20:30:43.10 0.6 undecidable manual P 307 0.4389 50 0.01 48
IV.GUMA.HHZ. 2021-10-20T20:30:43.01 0.1 undecidable manual S 48 0.2122 111 0.31 94
IV.MNTT.EHZ. 2021-10-20T20:30:42.56 1.0 negative manual P 68 0.3759 50 0.55 21
IV.TST02.HHZ. 2021-10-20T20:30:42.22 3.0 undecidable manual S -0.87 0
IV.CSP1.EHZ. 2021-10-20T20:30:41.26 0.3 undecidable manual S 20 0.1826 114 -0.38 70
IV.CESI.HHZ. 2021-10-20T20:30:41.63 0.6 undecidable manual S 298 0.1781 115 0.13 49
IV.ASSB.HHZ. 2021-10-20T20:30:41.48 0.6 negative manual P 290 0.3579 50 -0.23 46
IV.MMO1.EHZ. 2021-10-20T20:30:40.68 0.6 undecidable manual S 98 0.1529 118 0.05 50
IV.GAVE.EHZ. 2021-10-20T20:30:40.42 0.1 undecidable manual P 216 0.2815 50 0.02 98
IV.LNSS.HHZ. 2021-10-20T20:30:40.82 0.1 undecidable manual P 190 0.3229 50 -0.28 92
IV.SMA1.EHZ. 2021-10-20T20:30:40.14 0.1 undecidable manual P 151 0.3301 50 -1.09 68
IV.GUMA.HHZ. 2021-10-20T20:30:39.00 0.1 positive manual P 48 0.2122 111 0.01 100
IV.MML1.EHZ. 2021-10-20T20:30:39.55 1.0 undecidable manual P 331 0.2212 111 0.37 23
IV.MF5.EHZ. 2021-10-20T20:30:39.99 0.6 positive manual P 75 0.2581 108 0.05 49
IV.NRCA.HHZ. 2021-10-20T20:30:38.73 0.6 undecidable manual S 183 0.0872 134 0.18 49
IV.CSP1.EHZ. 2021-10-20T20:30:38.14 0.1 undecidable manual P 20 0.1826 114 -0.23 96
IV.FDMO.HHZ. 2021-10-20T20:30:38.98 0.6 undecidable manual S 349 0.1187 125 -0.51 46
IV.CESI.HHZ. 2021-10-20T20:30:38.35 0.1 positive manual P 298 0.1781 115 0.05 99
IV.MC2.EHZ. 2021-10-20T20:30:37.52 0.6 undecidable manual S 100 0.0513 148 -0.16 50
IV.MMO1.EHZ. 2021-10-20T20:30:37.74 0.1 positive manual P 98 0.1529 118 -0.05 100
IV.FDMO.HHZ. 2021-10-20T20:30:36.99 0.3 negative manual P 349 0.1187 125 -0.14 74
IV.MC2.EHZ. 2021-10-20T20:30:36.17 0.3 negative manual P 100 0.0513 148 0.08 76
IV.NRCA.HHZ. 2021-10-20T20:30:36.83 0.1 positive manual P 183 0.0872 134 0.24 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:1.6 0.0006435 0.1 AML other m 2021-10-20T20:30:38.85
IV.NRCA.HHN. ML:1.5 0.0004335 0.12 AML other m 2021-10-20T20:30:39.80
IV.FDMO.HHN. ML:1.1 0.000123 0.96 AML other m 2021-10-20T20:30:40.19
IV.FDMO.HHE. ML:1.1 0.000125 1.82 AML other m 2021-10-20T20:30:40.98
IV.CESI.HHN. ML:1.6 0.0002995 0.16 AML other m 2021-10-20T20:30:41.81
IV.CSP1.EHN. ML:1.8 0.0004315 1.5 AML other m 2021-10-20T20:30:41.20
IV.CSP1.EHE. ML:1.6 0.0003015 0.3 AML other m 2021-10-20T20:30:41.95
IV.CESI.HHE. ML:1.3 0.0001455 1.56 AML other m 2021-10-20T20:30:42.93
IV.MML1.HNN. ML:1.5 0.0001895 1.2 AML other m 2021-10-20T20:30:42.21
IV.GUMA.HHN. ML:1.5 0.0002145 0.54 AML other m 2021-10-20T20:30:43.26
IV.GAVE.EHN. ML:1.6 0.0002 0.94 AML other m 2021-10-20T20:30:45.45
IV.GAVE.EHE. ML:1.6 0.0001775 0.4 AML other m 2021-10-20T20:30:45.52
IV.GUMA.HHE. ML:1.6 0.0002565 1.54 AML other m 2021-10-20T20:30:45.93
IV.ASSB.HHN. ML:1.1 4.345E-5 1.08 AML other m 2021-10-20T20:30:48.57
IV.ASSB.HHE. ML:1.2 4.925E-5 1.5 AML other m 2021-10-20T20:30:48.18
IV.TST02.HHE. ML:3.5 0.00177 0.76 AML other m 2021-10-20T20:30:58.88
IV.TST02.HHN. ML:3.4 0.001305 0.42 AML other m 2021-10-20T20:31:00.72
IX.NSC3.EHE.02 ML:3.2 0.000198 1.52 AML other m 2021-10-20T20:31:13.08
IX.NSC3.EHN.02 ML:3.3 0.000309 0.1 AML other m 2021-10-20T20:31:14.66
IV.MML1.HNE. ML:1.4 0.0001578 0.54 AML other m 2021-10-20T20:31:16.37
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