Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 23-10-2021 and time 19:12:25 (Italy) in region 5 km S Monte Cavallo (MC)

A magnitude ML 1.1 earthquake occured in region: 5 km S Monte Cavallo (MC), on

  • 23-10-2021 17:12:25 (UTC)
  • 23-10-2021 19:12:25 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.9530, 13.0090 at 13 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.

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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
Monte Cavallo MC 5 145 145
Visso MC 7 1107 1252
Preci PG 9 724 1976
Sellano PG 10 1079 3055
Ussita MC 11 444 3499
Pieve Torina MC 11 1458 4957
Fiordimonte MC 12 202 5159
Castelsantangelo sul Nera MC 13 281 5440
Pievebovigliana MC 14 866 6306
Serravalle di Chienti MC 14 1070 7376
Muccia MC 15 915 8291
Fiastra MC 15 559 8850
Acquacanina MC 16 121 8971
Cerreto di Spoleto PG 17 1075 10046
Bolognola MC 18 142 10188
Norcia PG 19 4957 15145

Municipalities with at least 50000 inhabitants

An earthquake occurred to
25 Km E of Foligno (57155 inhabitants)
53 Km NE of Terni (111501 inhabitants)
53 Km E of Perugia (166134 inhabitants)
66 Km NW of Teramo (54892 inhabitants)
74 Km NW of L'Aquila (69753 inhabitants)
85 Km SW of Ancona (100861 inhabitants)
95 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
Reviewed
Rev100 		ML 1.1 2021-10-23
17:12:25		 42.9532 13.009 13 2021-10-23
17:22:45		 Sala Sismica INGV-Roma 96913691
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-23 17:12:25 ± 0.06
Latitude 42.9532 ± 0.0027
Longitude 13.0090 ± 0.0037
Depth (km) 13 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 96913691

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 300
Semi-minor axis of confidence ellipse (meter) 16
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 52
Circular confidence region, given by single value of horizontal uncertainty (meter) 300.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 51
Number of associated phases, regardless of their use for origin computation 28
Number of defining phases 28
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.16
Epicentral distance of station closest to the epicenter (degree) 0.03148
Epicentral distance of station farthest from the epicenter (degree) 0.38221
Number of stations at which the event was observed 15
Number of stations from which data was used for origin computation 15
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 10
Type of magnitude ML
Reference to an origin 96913691
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-23 17:22:45
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SNTG.HHZ. 2021-10-23T17:12:37.46 0.3 undecidable manual S 351 33.9438 94 0.28 68
IV.GAVE.EHZ. 2021-10-23T17:12:36.54 0.3 undecidable manual S 198 30.4473 95 0.29 69
IV.ASSB.HHZ. 2021-10-23T17:12:36.06 0.3 undecidable manual S 289 30.1476 95 -0.11 71
IV.MMO1.EHZ. 2021-10-23T17:12:35.20 0.3 undecidable manual S 103 26.4513 96 -0.01 73
IV.CSP1.EHZ. 2021-10-23T17:12:34.07 0.3 undecidable manual S 46 22.1556 99 0.02 73
IV.PF6.EHZ. 2021-10-23T17:12:34.86 0.3 undecidable manual S 36 25.4523 97 -0.06 73
IV.EL6.EHZ. 2021-10-23T17:12:33.58 0.1 undecidable manual P 10 42.4242 93 -0.04 94
IV.MC2.EHZ. 2021-10-23T17:12:32.50 0.3 undecidable manual S 108 15.3735 111 0.21 72
IV.MML1.EHZ. 2021-10-23T17:12:32.90 0.3 undecidable manual S 350 18.0708 104 -0.08 73
IV.MOMA.HNE. 2021-10-23T17:12:32.45 0.6 undecidable manual P 245 39.3273 93 -0.69 40
IV.NRCA.HHZ. 2021-10-23T17:12:32.13 0.3 undecidable manual S 147 15.7731 110 -0.28 70
IV.SNTG.HHZ. 2021-10-23T17:12:32.19 0.1 undecidable manual P 351 33.9438 94 -0.12 94
IV.MMO1.EHZ. 2021-10-23T17:12:31.11 0.1 undecidable manual P 103 26.4513 96 -0.06 96
IV.CESI.HHZ. 2021-10-23T17:12:31.15 0.3 undecidable manual S 304 10.2786 128 0.04 74
IV.GAVE.EHZ. 2021-10-23T17:12:31.70 0.1 undecidable manual P 198 30.4473 95 -0.07 95
IV.FDMO.HHZ. 2021-10-23T17:12:31.18 0.3 undecidable manual S 34 11.1777 124 -0.14 73
IV.ASSB.HHZ. 2021-10-23T17:12:31.95 0.1 undecidable manual P 289 30.1476 95 0.23 92
IV.PF6.EHZ. 2021-10-23T17:12:30.91 0.1 undecidable manual P 36 25.4523 97 -0.09 96
IV.FEMA.HNZ. 2021-10-23T17:12:30.18 0.3 undecidable manual S 73 3.4965 161 0.13 74
IV.CSP1.EHZ. 2021-10-23T17:12:30.57 0.1 undecidable manual P 46 22.1556 99 0.07 97
IT.MTCL.HGZ. 2021-10-23T17:12:29.90 0.3 undecidable manual S 350 4.5954 154 -0.26 72
IV.NRCA.HHZ. 2021-10-23T17:12:29.47 0.1 undecidable manual P 147 15.7731 110 -0.09 97
IV.MC2.EHZ. 2021-10-23T17:12:29.58 0.1 undecidable manual P 108 15.3735 111 0.09 98
IV.MML1.EHZ. 2021-10-23T17:12:29.88 0.1 undecidable manual P 350 18.0708 104 -0.01 99
IT.MTCL.HGZ. 2021-10-23T17:12:28.32 0.1 undecidable manual P 350 4.5954 154 0.06 100
IV.CESI.HHZ. 2021-10-23T17:12:28.92 0.1 undecidable manual P 304 10.2786 128 0.12 98
IV.FEMA.HNZ. 2021-10-23T17:12:28.37 0.1 undecidable manual P 73 3.4965 161 0.18 98
IV.FDMO.HHZ. 2021-10-23T17:12:28.99 0.1 undecidable manual P 34 11.1777 124 0.06 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CESI.HHE. ML:1.0 0.0000998 0.34 AML other m 2021-10-23T17:12:31.36
IV.FDMO.HHE. ML:1.3 0.000201 0.14 AML other m 2021-10-23T17:12:31.33
IV.FDMO.HHN. ML:1.4 0.0002415 0.12 AML other m 2021-10-23T17:12:31.35
IV.CESI.HHN. ML:1.1 0.00014250000000000002 0.46 AML other m 2021-10-23T17:12:31.43
IV.NRCA.HHE. ML:1.4 0.000195 0.44 AML other m 2021-10-23T17:12:32.30
IV.NRCA.HHN. ML:1.4 0.00020050000000000002 0.78 AML other m 2021-10-23T17:12:32.26
IV.MML1.EHN. ML:1.0 0.0000837 0.24 AML other m 2021-10-23T17:12:33.34
IV.MML1.EHE. ML:0.9 0.00005605 1.44 AML other m 2021-10-23T17:12:33.22
IV.GAVE.EHN. ML:1.0 0.00004375 1.08 AML other m 2021-10-23T17:12:37.10
IV.GAVE.EHE. ML:0.9 0.0000413 0.9 AML other m 2021-10-23T17:12:37.80
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