Earthquake with magnitude of ML 1.2 on date 20-10-2021 and time 14:57:58 (UTC) in region 2 km E Visso (MC)

A magnitude ML 1.2 earthquake occured in region: 2 km E Visso (MC), on

  • 20-10-2021 14:57:58 (UTC)
  • 20-10-2021 16:57:58 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.925, 13.116 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 2 1107 1107
Ussita MC 3 444 1551
Castelsantangelo sul Nera MC 5 281 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 14 1458 5183
Norcia PG 15 4957 10140
Pievebovigliana MC 16 866 11006
Sellano PG 16 1079 12085
Montemonaco AP 18 604 12689
Muccia MC 19 915 13604
Montefortino FM 19 1178 14782
Sarnano MC 20 3264 18046
Cerreto di Spoleto PG 20 1075 19121
Montegallo AP 20 523 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)
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 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
ML 1.2 2021-10-20
14:57:58
42.925 13.1158 9 2021-10-20
15:02:20
Sala Sismica INGV-Roma 96803471
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-20 14:57:58 ± 0.05
Latitude 42.9250 ± 0.0027
Longitude 13.1158 ± 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 96803471

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 274
Semi-minor axis of confidence ellipse (meter) 175
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 279
Circular confidence region, given by single value of horizontal uncertainty (meter) 270
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 75
Number of associated phases, regardless of their use for origin computation 25
Number of defining phases 24
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.14
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.46855
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 13
Magnitude information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.3
Num. used stations 16
Type of magnitude ML
Reference to an origin 96803471
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-20 15:02:20
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.TERO.HHZ. 2021-10-20T14:58:15.35 0.6 undecidable manual S 130 0.4685 50 0.11 46
IV.EL6.EHZ. 2021-10-20T14:58:13.71 3.0 undecidable manual S 0.03 0
IV.LNSS.HHZ. 2021-10-20T14:58:11.02 0.6 undecidable manual S 190 0.3265 50 -0.03 48
IV.MF5.EHZ. 2021-10-20T14:58:09.40 0.6 undecidable manual S 76 0.259 107 0.53 44
IV.GAVE.EHZ. 2021-10-20T14:58:09.81 0.6 undecidable manual S 215 0.2842 50 0.04 48
IV.TERO.HHZ. 2021-10-20T14:58:08.37 0.6 undecidable manual P 130 0.4685 50 0.24 45
IV.MTRA.EHZ. 2021-10-20T14:58:08.71 0.6 undecidable manual S 129 0.2653 107 -0.4 45
IV.MML1.EHZ. 2021-10-20T14:58:07.37 0.6 undecidable manual S 331 0.2158 110 0.08 48
IV.SMA1.EHZ. 2021-10-20T14:58:05.74 1.0 undecidable manual P 151 0.3354 50 -0.12 23
IV.CSP1.EHZ. 2021-10-20T14:58:05.84 0.6 undecidable manual S 21 0.179 114 -0.13 48
IV.ASSB.HHZ. 2021-10-20T14:58:05.99 1.0 negative manual P 290 0.3543 50 -0.19 23
IV.LNSS.HHZ. 2021-10-20T14:58:05.56 0.3 undecidable manual P 190 0.3265 50 -0.15 70
IV.MMO1.EHZ. 2021-10-20T14:58:04.94 0.6 undecidable manual S 99 0.1565 117 -0.25 47
IV.MTRA.EHZ. 2021-10-20T14:58:04.53 0.6 undecidable manual P 129 0.2653 107 -0.06 48
IV.MF5.EHZ. 2021-10-20T14:58:04.54 0.6 positive manual P 76 0.259 107 0.08 48
IV.GAVE.EHZ. 2021-10-20T14:58:04.98 0.1 negative manual P 215 0.2842 50 0 97
IV.NRCA.HNZ. 2021-10-20T14:58:03.14 0.6 undecidable manual S 181 0.0917 131 0.04 50
IV.FDMO.HHZ. 2021-10-20T14:58:03.66 0.6 undecidable manual S 349 0.1133 125 -0.11 49
IV.MML1.EHZ. 2021-10-20T14:58:03.54 1.0 positive manual P 331 0.2158 110 0 25
IV.MC2.EHZ. 2021-10-20T14:58:02.08 0.6 undecidable manual S 104 0.0549 145 -0.09 50
IV.MMO1.EHZ. 2021-10-20T14:58:02.29 0.1 positive manual P 99 0.1565 117 -0.04 99
IV.CSP1.EHZ. 2021-10-20T14:58:02.38 1.0 negative manual P 21 0.179 114 -0.4 23
IV.FDMO.HHZ. 2021-10-20T14:58:01.53 0.1 negative manual P 349 0.1133 125 0.02 100
IV.NRCA.HNZ. 2021-10-20T14:58:01.36 0.3 negative manual P 181 0.0917 131 0.24 72
IV.MC2.EHZ. 2021-10-20T14:58:00.70 0.1 undecidable manual P 104 0.0549 145 0.12 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:1.7 0.000691 0.08 AML other m 2021-10-20T14:58:03.35
IV.FDMO.HHN. ML:0.9 9.835E-5 0.2 AML other m 2021-10-20T14:58:03.74
IV.FDMO.HHE. ML:0.9 9.76E-5 0.26 AML other m 2021-10-20T14:58:03.71
IV.NRCA.HHN. ML:1.5 0.0004035 0.66 AML other m 2021-10-20T14:58:04.36
IV.CSP1.EHN. ML:1.6 0.0002935 0.26 AML other m 2021-10-20T14:58:06.49
IV.CSP1.EHE. ML:1.6 0.000273 0.32 AML other m 2021-10-20T14:58:06.50
IV.MML1.EHN. ML:0.7 3.16E-5 1.28 AML other m 2021-10-20T14:58:09.22
IV.MTRA.EHE. ML:1.2 8.515E-5 1.14 AML other m 2021-10-20T14:58:09.87
IV.GAVE.EHN. ML:1.5 0.0001395 1.06 AML other m 2021-10-20T14:58:09.95
IV.GAVE.EHE. ML:1.4 0.0001245 0.38 AML other m 2021-10-20T14:58:10.21
IV.MTRA.EHN. ML:1.2 7.91E-5 0.66 AML other m 2021-10-20T14:58:10.19
IV.MML1.EHE. ML:0.7 3.115E-5 1.44 AML other m 2021-10-20T14:58:10.83
IV.LNSS.HHN. ML:1.3 8.74E-5 0.2 AML other m 2021-10-20T14:58:11.47
IV.LNSS.HHE. ML:1.2 5.485E-5 0.66 AML other m 2021-10-20T14:58:12.52
IV.ASSB.HHN. ML:1 3.595E-5 0.9 AML other m 2021-10-20T14:58:12.53
IV.ASSB.HHE. ML:1.1 4.75E-5 0.5 AML other m 2021-10-20T14:58:13.68
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