Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.0 on date 21-04-2021 and time 12:24:49 (Italy) in region 5 km S Monte Cavallo (MC)

A magnitude ML 1.0 earthquake occured in region: 5 km S Monte Cavallo (MC), on

  • 21-04-2021 10:24:49 (UTC)
  • 21-04-2021 12:24:49 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.9460, 13.0070 at 11 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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 8 724 1976
Sellano PG 9 1079 3055
Ussita MC 11 444 3499
Pieve Torina MC 12 1458 4957
Fiordimonte MC 12 202 5159
Castelsantangelo sul Nera MC 13 281 5440
Pievebovigliana MC 14 866 6306
Serravalle di Chienti MC 15 1070 7376
Muccia MC 16 915 8291
Fiastra MC 16 559 8850
Cerreto di Spoleto PG 16 1075 9925
Acquacanina MC 17 121 10046
Norcia PG 18 4957 15003
Bolognola MC 19 142 15145

Municipalities with at least 50000 inhabitants

An earthquake occurred to
25 Km E of Foligno (57155 inhabitants)
52 Km NE of Terni (111501 inhabitants)
53 Km E of Perugia (166134 inhabitants)
65 Km W of Teramo (54892 inhabitants)
74 Km NW of L'Aquila (69753 inhabitants)
85 Km SW of Ancona (100861 inhabitants)
94 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
Bulletin
Rev1000 		ML 1.0 2021-04-21
10:24:49		 42.9465 13.0072 11 2021-07-12
16:55:12		 Bollettino Sismico Italiano INGV 90452081
Reviewed
Rev100 		ML 1.1 2021-04-21
10:24:49		 42.9498 13.012 11 2021-04-21
10:35:29		 Sala Sismica INGV-Roma 89326361
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-21 10:24:49 ± 0.11
Latitude 42.9465 ± 0.0054
Longitude 13.0072 ± 0.0061
Depth (km) 11 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 90452081

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 653
Semi-minor axis of confidence ellipse (meter) 232
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 33
Circular confidence region, given by single value of horizontal uncertainty (meter) 650.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 146
Number of associated phases, regardless of their use for origin computation 31
Number of defining phases 20
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.24
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.27249
Number of stations at which the event was observed 20
Number of stations from which data was used for origin computation 10
Magnitudes information

ML:1.0

Field Value
Value 1.0
Uncertainty 0.2
Num. used stations 6
Type of magnitude ML
Reference to an origin 90452081
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-05-24 14:34:08

ML:1.1

Field Value
Value 1.1
Uncertainty 0.6
Num. used stations 10
Type of magnitude ML
Reference to an origin 89326361
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-21 10:35:29
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.CANO.HHZ. 2021-04-21T10:26:22.07 3.0 undecidable manual Sg 3.14 0
OX.SABO.HHZ. 2021-04-21T10:26:22.38 3.0 undecidable manual Sg 10.87 0
IV.SENA.HHZ. 2021-04-21T10:26:22.29 3.0 undecidable manual Sg 2.32 0
IV.MFNL.HHZ. 2021-04-21T10:26:01.20 3.0 undecidable manual Pn -0.87 0
IV.GIZZ.HHZ. 2021-04-21T10:26:00.49 3.0 undecidable manual Pn 3.21 0
IV.PIPA.HHZ. 2021-04-21T10:25:49.51 3.0 positive manual Pn -6.16 0
IV.OPPE.HHZ. 2021-04-21T10:25:46.12 3.0 undecidable manual Sn -9.99 0
MN.BLY.HHZ. 2021-04-21T10:25:40.92 3.0 negative manual Pn -1.71 0
IV.CAFE.HHZ. 2021-04-21T10:25:29.05 3.0 undecidable manual Pn 0.2 0
IV.PE3.EHZ. 2021-04-21T10:25:08.63 3.0 undecidable manual S -2.74 0
IV.MMO1.EHZ. 2021-04-21T10:24:59.02 0.6 undecidable manual S 101 26.4513 50 -0.15 48
IV.ASSB.HHZ. 2021-04-21T10:24:59.77 0.3 undecidable manual S 291 30.2475 50 -0.4 67
IV.CSP1.EHZ. 2021-04-21T10:24:58.15 0.3 undecidable manual S 45 22.755 50 -0.02 72
IV.PE3.EHZ. 2021-04-21T10:24:56.48 3.0 negative manual P -3.42 0
IV.MML1.HNE. 2021-04-21T10:24:56.88 0.3 undecidable manual S 351 18.7701 50 -0.22 71
IV.MC2.EHZ. 2021-04-21T10:24:56.32 0.3 undecidable manual S 105 15.2736 126 0.22 71
IV.ASSB.HHZ. 2021-04-21T10:24:56.25 0.1 undecidable manual P 291 30.2475 50 0.55 83
IV.FDMO.HHZ. 2021-04-21T10:24:55.14 0.6 undecidable manual S 33 11.877 132 -0.06 49
IV.NRCA.HHZ. 2021-04-21T10:24:55.83 0.6 undecidable manual S 145 15.2736 126 -0.27 47
IV.CESI.HHZ. 2021-04-21T10:24:54.84 0.3 undecidable manual S 308 10.5783 136 -0.02 74
IV.MMO1.EHZ. 2021-04-21T10:24:54.32 0.6 undecidable manual P 101 26.4513 50 -0.8 40
IV.CSP1.EHZ. 2021-04-21T10:24:54.56 1.0 positive manual P 45 22.755 50 0.01 24
IV.NRCA.HHZ. 2021-04-21T10:24:53.24 0.1 undecidable manual P 145 15.2736 126 -0.11 97
IV.MC2.EHZ. 2021-04-21T10:24:53.46 0.1 undecidable manual P 105 15.2736 126 0.11 96
IT.MTCL.HGZ. 2021-04-21T10:24:53.61 0.3 undecidable manual S 353 5.2947 154 -0.19 71
IV.MML1.HNE. 2021-04-21T10:24:53.83 0.1 undecidable manual P 351 18.7701 50 -0.1 97
IV.FEMA.HNE. 2021-04-21T10:24:53.86 0.3 undecidable manual S 63 3.8961 160 0.25 73
IV.FEMA.HNE. 2021-04-21T10:24:52.16 0.1 undecidable manual P 63 3.8961 160 0.25 96
IV.CESI.HHZ. 2021-04-21T10:24:52.71 0.6 undecidable manual P 308 10.5783 136 0.08 49
IT.MTCL.HGZ. 2021-04-21T10:24:52.08 0.1 undecidable manual P 353 5.2947 154 0.05 100
IV.FDMO.HHZ. 2021-04-21T10:24:52.95 1.0 undecidable manual P 33 11.877 132 0.12 24
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CESI.HHE. ML:0.7 0.00006120000000000001 0.12 AML other m 2021-04-21T10:24:54.87
IV.CESI.HHN. ML:0.9 0.00009359999999999998 1.56 AML other m 2021-04-21T10:24:55.10
IV.FDMO.HHN. ML:1.0 0.00009889999999999999 0.2 AML other m 2021-04-21T10:24:55.20
IV.FDMO.HHE. ML:0.9 0.0000965 0.34 AML other m 2021-04-21T10:24:55.29
IV.CSP1.EHE. ML:1.3 0.000131 0.36 AML other m 2021-04-21T10:24:58.86
IV.CSP1.EHN. ML:1.1 0.0000872 0.22 AML other m 2021-04-21T10:24:58.88
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