Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 21-10-2021 and time 08:54:24 (UTC) in region 4 km NW Visso (MC)

A magnitude ML 1.1 earthquake occured in region: 4 km NW Visso (MC), on

  • 21-10-2021 08:54:24 (UTC)
  • 21-10-2021 10:54:24 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.9500, 13.0540 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.

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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 7 145 1252
Ussita MC 7 444 1696
Preci PG 8 724 2420
Castelsantangelo sul Nera MC 10 281 2701
Fiordimonte MC 10 202 2903
Pieve Torina MC 11 1458 4361
Sellano PG 12 1079 5440
Fiastra MC 13 559 5999
Pievebovigliana MC 13 866 6865
Acquacanina MC 13 121 6986
Muccia MC 15 915 7901
Bolognola MC 15 142 8043
Serravalle di Chienti MC 16 1070 9113
Norcia PG 18 4957 14070
Cerreto di Spoleto PG 18 1075 15145

Municipalities with at least 50000 inhabitants

An earthquake occurred to
28 Km E of Foligno (57155 inhabitants)
54 Km NE of Terni (111501 inhabitants)
57 Km E of Perugia (166134 inhabitants)
62 Km NW of Teramo (54892 inhabitants)
72 Km NW of L'Aquila (69753 inhabitants)
83 Km SW of Ancona (100861 inhabitants)
98 Km NE of Viterbo (67173 inhabitants)
100 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 2021-10-21
08:54:24		 42.9498 13.0537 9 2021-10-21
09:00:53		 Sala Sismica INGV-Roma 96834501
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-21 08:54:24 ± 0.11
Latitude 42.9498 ± 0.0018
Longitude 13.0537 ± 0.0037
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 96834501

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 270
Semi-minor axis of confidence ellipse (meter) 27
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 240
Circular confidence region, given by single value of horizontal uncertainty (meter) 270.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 138
Number of associated phases, regardless of their use for origin computation 34
Number of defining phases 11
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.09
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.17986
Number of stations at which the event was observed 28
Number of stations from which data was used for origin computation 6
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 96834501
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-21 09:00:53
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.TEOL.HHZ. 2021-10-21T08:56:13.02 3.0 undecidable manual Sg 16.200001 0
IV.CRND.HNZ. 2021-10-21T08:55:48.79 3.0 undecidable manual Sn -9.99 0
GU.GRAM.HHZ. 2021-10-21T08:55:47.04 3.0 undecidable manual Sn -9.46 0
IV.NDIM.HHZ. 2021-10-21T08:55:40.19 3.0 undecidable manual Sn -9.99 0
IV.EFIU.HHZ. 2021-10-21T08:55:27.76 3.0 undecidable manual Sn -4.75 0
IV.BAG8.EHZ. 2021-10-21T08:55:24.14 3.0 positive manual Pg 10.48 0
IV.RIBO.EHZ.01 2021-10-21T08:55:24.64 3.0 undecidable manual Sg 5.25 0
IV.PE3.EHZ. 2021-10-21T08:55:20.95 3.0 undecidable manual Sg 6.71 0
IV.GIZZ.HHZ. 2021-10-21T08:55:17.80 3.0 undecidable manual Sg 6.37 0
SL.LJU.BHZ. 2021-10-21T08:55:15.77 3.0 negative manual Pg 10.47 0
IV.HVIT.HHZ. 2021-10-21T08:55:13.22 3.0 undecidable manual Pg 14.41 0
IV.MSSA.HHZ. 2021-10-21T08:55:11.21 3.0 negative manual Pg 6.59 0
IV.MNTV.EHZ. 2021-10-21T08:55:04.94 3.0 negative manual Pn 0.66 0
IV.APEC.HHZ. 2021-10-21T08:55:04.53 3.0 undecidable manual Sn -7.61 0
IV.IMOL.HNZ. 2021-10-21T08:54:44.51 3.0 undecidable manual Pn -5.55 0
IV.LAV9.HNZ. 2021-10-21T08:54:34.61 3.0 undecidable manual Sg -4.21 0
IV.CSP1.EHZ. 2021-10-21T08:54:32.54 0.6 undecidable manual S 38 19.9689 114 0.13 48
IV.MC2.EHZ. 2021-10-21T08:54:30.06 0.6 undecidable manual S 111 11.7771 127 0.12 49
IV.NRCA.HHZ. 2021-10-21T08:54:30.47 0.6 undecidable manual S 159 13.7751 122 -0.04 50
IV.CESI.HHZ. 2021-10-21T08:54:30.59 0.6 undecidable manual S 297 13.5753 123 0.14 49
IV.FDMO.HHZ. 2021-10-21T08:54:29.30 0.6 undecidable manual S 16 9.9789 131 -0.16 49
IV.CSP1.EHZ. 2021-10-21T08:54:29.22 0.3 undecidable manual P 38 19.9689 114 0.01 74
IV.MML1.EHZ. 2021-10-21T08:54:29.16 1.0 positive manual P 340 19.3695 114 0.06 24
IV.NRCA.HHZ. 2021-10-21T08:54:28.06 0.1 positive manual P 159 13.7751 122 -0.05 99
IV.CESI.HHZ. 2021-10-21T08:54:28.08 0.1 positive manual P 297 13.5753 123 0 100
IV.FDMO.HHZ. 2021-10-21T08:54:27.39 0.1 undecidable manual P 16 9.9789 131 -0.12 98
IV.MC2.EHZ. 2021-10-21T08:54:27.84 0.3 positive manual P 111 11.7771 127 0.06 74
OT.OT05.EHZ. 2021-10-21T08:54:20.89 3.0 undecidable manual Sn -7.39 0
IV.GIUL.HHZ. 2021-10-21T08:54:18.41 3.0 undecidable manual S -8 0
IV.VBKN.HHZ. 2021-10-21T08:54:11.27 3.0 undecidable manual Sn 0.97 0
IV.MCRV.HHZ. 2021-10-21T08:54:06.30 3.0 negative manual P -2.36 0
IV.GIUL.HHZ. 2021-10-21T08:54:05.97 3.0 undecidable manual P -5.53 0
IV.MOCO.HHZ. 2021-10-21T08:54:03.14 3.0 undecidable manual P -1.87 0
IV.BSSO.HHZ. 2021-10-21T08:53:59.54 3.0 negative manual P 0.59 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FDMO.HHE. ML:1.4 0.00033650000000000005 0.2 AML other m 2021-10-21T08:54:29.40
IV.FDMO.HHN. ML:1.1 0.000179 0.16 AML other m 2021-10-21T08:54:29.66
IV.NRCA.HHN. ML:1.5 0.00033650000000000005 1.86 AML other m 2021-10-21T08:54:31.02
IV.NRCA.HHE. ML:1.3 0.000232394 0.1024 AML other m 2021-10-21T08:54:30.85
IV.CESI.HHN. ML:1.1 0.00012687237 0.224 AML other m 2021-10-21T08:54:31.90
IV.CESI.HHE. ML:0.7 0.000061776515 0.1856 AML other m 2021-10-21T08:54:31.41
IV.CSP1.EHE. ML:1.2 0.00011272693 0.32 AML other m 2021-10-21T08:54:34.90
IV.CSP1.EHN. ML:1.3 0.00015856986721 0.1792 AML other m 2021-10-21T08:54:34.87
IV.MML1.EHE. ML:0.5 0.000027055045 0.1856 AML other m 2021-10-21T08:54:34.01
IV.MML1.EHN. ML:0.8 0.000052034585 0.2048 AML other m 2021-10-21T08:54:35.85
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