Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 26-10-2021 and time 20:28:28 (UTC) in region 6 km SW Monte Cavallo (MC)

A magnitude ML 0.9 earthquake occured in region: 6 km SW Monte Cavallo (MC), on

  • 26-10-2021 20:28:28 (UTC)
  • 26-10-2021 22:28:28 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.9490, 12.9650 at 10 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 6 145 145
Sellano PG 7 1079 1224
Preci PG 10 724 1948
Visso MC 10 1107 3055
Pieve Torina MC 13 1458 4513
Serravalle di Chienti MC 14 1070 5583
Fiordimonte MC 14 202 5785
Ussita MC 14 444 6229
Cerreto di Spoleto PG 15 1075 7304
Pievebovigliana MC 16 866 8170
Muccia MC 16 915 9085
Castelsantangelo sul Nera MC 17 281 9366
Fiastra MC 18 559 9925
Trevi PG 19 8469 18394
Acquacanina MC 19 121 18515

Municipalities with at least 50000 inhabitants

An earthquake occurred to
21 Km E of Foligno (57155 inhabitants)
50 Km E of Perugia (166134 inhabitants)
50 Km NE of Terni (111501 inhabitants)
68 Km W of Teramo (54892 inhabitants)
75 Km NW of L'Aquila (69753 inhabitants)
87 Km SW of Ancona (100861 inhabitants)
92 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 0.9 2021-10-26
20:28:28		 42.9492 12.9653 10 2021-10-26
20:33:15		 Sala Sismica INGV-Roma 97009031
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-26 20:28:28 ± 0.05
Latitude 42.9492 ± 0.0018
Longitude 12.9653 ± 0.0037
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 97009031

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 317
Semi-minor axis of confidence ellipse (meter) 188
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 246
Circular confidence region, given by single value of horizontal uncertainty (meter) 320.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 129
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 15
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) 0.30667
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 8
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 97009031
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-26 20:33:15
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.PE3.EHZ. 2021-10-26T20:28:57.28 3.0 undecidable manual S -0.12 0
IV.SNTG.HHZ. 2021-10-26T20:28:40.34 0.3 undecidable manual S 357 34.0437 50 0.07 72
IV.MMO1.EHZ. 2021-10-26T20:28:39.11 0.6 undecidable manual S 101 29.8479 50 -0.06 49
IV.CSP1.EHZ. 2021-10-26T20:28:37.83 0.6 undecidable manual S 51 25.0527 50 -0.06 49
IV.NRCA.HHZ. 2021-10-26T20:28:35.57 0.6 undecidable manual S 137 17.6712 120 -0.05 50
IV.SNTG.HHZ. 2021-10-26T20:28:35.21 0.1 undecidable manual P 357 34.0437 50 -0.1 96
IV.MML1.EHZ. 2021-10-26T20:28:35.71 0.3 undecidable manual S 2 18.2706 119 -0.09 74
IV.MMO1.EHZ. 2021-10-26T20:28:34.75 1.0 negative manual P 101 29.8479 50 0.07 24
IV.CSP1.EHZ. 2021-10-26T20:28:34.03 0.6 negative manual P 51 25.0527 50 0.09 49
IV.GAVE.EHZ. 2021-10-26T20:28:34.43 0.6 negative manual P 192 29.0487 50 -0.13 48
IV.FDMO.HHZ. 2021-10-26T20:28:34.42 0.3 undecidable manual S 46 13.875 126 -0.1 74
IV.MML1.EHZ. 2021-10-26T20:28:32.82 0.3 undecidable manual P 2 18.2706 119 0.09 74
IV.CESI.HHZ. 2021-10-26T20:28:32.83 0.6 undecidable manual S 321 7.881 142 -0.2 49
IV.FDMO.HHZ. 2021-10-26T20:28:32.12 0.1 undecidable manual P 46 13.875 126 0.12 99
IV.NRCA.HHZ. 2021-10-26T20:28:32.65 0.1 undecidable manual P 137 17.6712 120 0.02 100
IV.CESI.HHZ. 2021-10-26T20:28:31.26 0.1 positive manual P 321 7.881 142 0.12 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CESI.HHE. ML:1.0 0.0001265 0.08 AML other m 2021-10-26T20:28:33.12
IV.CESI.HHN. ML:1.0 0.000161 1.68 AML other m 2021-10-26T20:28:33.96
IV.FDMO.HHN. ML:0.6 0.00003885 0.22 AML other m 2021-10-26T20:28:34.67
IV.FDMO.HHE. ML:0.7 0.000054600000000000006 0.9 AML other m 2021-10-26T20:28:35.20
IV.NRCA.HHN. ML:1.2 0.00013450000000000002 0.14 AML other m 2021-10-26T20:28:35.64
IV.NRCA.HHE. ML:1.1 0.00009955 0.12 AML other m 2021-10-26T20:28:35.82
IV.MML1.EHN. ML:0.8 0.000048 0.16 AML other m 2021-10-26T20:28:36.02
IV.MML1.EHE. ML:0.9 0.000058049999999999995 0.22 AML other m 2021-10-26T20:28:36.12
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