Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 20-04-2021 and time 05:42:08 (Italy) in region 6 km S Monte Cavallo (MC)

A magnitude ML 1.1 earthquake occured in region: 6 km S Monte Cavallo (MC), on

  • 20-04-2021 03:42:08 (UTC)
  • 20-04-2021 05:42:08 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.9430, 12.9910 at 12 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 8 1079 1224
Visso MC 8 1107 2331
Preci PG 8 724 3055
Ussita MC 12 444 3499
Pieve Torina MC 12 1458 4957
Fiordimonte MC 13 202 5159
Castelsantangelo sul Nera MC 14 281 5440
Serravalle di Chienti MC 15 1070 6510
Cerreto di Spoleto PG 15 1075 7585
Pievebovigliana MC 16 866 8451
Muccia MC 16 915 9366
Fiastra MC 17 559 9925
Acquacanina MC 18 121 10046
Norcia PG 19 4957 15003

Municipalities with at least 50000 inhabitants

An earthquake occurred to
23 Km E of Foligno (57155 inhabitants)
51 Km NE of Terni (111501 inhabitants)
52 Km E of Perugia (166134 inhabitants)
66 Km W of Teramo (54892 inhabitants)
74 Km NW of L'Aquila (69753 inhabitants)
86 Km SW of Ancona (100861 inhabitants)
93 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 2021-04-20
03:42:08		 42.9427 12.9907 13 2021-04-20
03:48:52		 Sala Sismica INGV-Roma 89281631
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-20 03:42:08 ± 0.08
Latitude 42.9427 ± 0.0036
Longitude 12.9907 ± 0.0061
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 89281631

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 463
Semi-minor axis of confidence ellipse (meter) 201
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 244
Circular confidence region, given by single value of horizontal uncertainty (meter) 460.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 56
Number of associated phases, regardless of their use for origin computation 23
Number of defining phases 23
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.21
Epicentral distance of station closest to the epicenter (degree) 0.04766
Epicentral distance of station farthest from the epicenter (degree) 0.46675
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 12
Type of magnitude ML
Reference to an origin 89281631
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-20 03:48:52
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MURB.HHZ. 2021-04-20T03:42:18.28 0.6 undecidable manual P 313 51.8037 92 0.43 44
IV.CSP1.EHZ. 2021-04-20T03:42:17.17 0.3 undecidable manual S 46 23.9538 97 -0.15 73
IV.EL6.EHZ. 2021-04-20T03:42:16.45 0.3 undecidable manual P 12 43.8228 93 -0.17 70
IV.MC2.EHZ. 2021-04-20T03:42:16.17 0.3 undecidable manual S 102 16.4724 107 0.81 60
IV.ATCC.EHZ. 2021-04-20T03:42:16.15 0.3 undecidable manual P 314 39.1275 93 0.26 70
IV.MOMA.HHZ. 2021-04-20T03:42:15.87 0.6 undecidable manual P 246 37.5291 93 0.23 47
IV.MML1.EHE. 2021-04-20T03:42:15.77 0.3 undecidable manual S 355 18.9699 102 -0.24 72
IV.FDMO.HHZ. 2021-04-20T03:42:14.29 0.3 undecidable manual S 37 13.0758 117 -0.21 73
IV.MMO1.EHZ. 2021-04-20T03:42:14.01 0.3 undecidable manual P 100 27.75 95 -0.13 73
IV.NRCA.HHZ. 2021-04-20T03:42:14.86 0.3 undecidable manual S 140 15.7731 109 -0.31 72
IV.GAVE.EHZ. 2021-04-20T03:42:14.19 0.3 undecidable manual P 196 28.8489 95 -0.13 73
IV.ASSB.HHZ. 2021-04-20T03:42:14.23 0.3 undecidable manual P 292 29.1486 95 -0.12 72
IV.CSP1.EHZ. 2021-04-20T03:42:13.57 0.3 undecidable manual P 46 23.9538 97 0 75
IV.FEMA.HNZ. 2021-04-20T03:42:13.08 0.3 undecidable manual S 66 5.2947 151 0.07 76
IV.CESI.HHZ. 2021-04-20T03:42:13.89 0.3 undecidable manual S 315 9.7791 130 0.1 76
IV.MC2.EHZ. 2021-04-20T03:42:12.47 0.3 undecidable manual P 102 16.4724 107 0.04 75
IV.MML1.EHE. 2021-04-20T03:42:12.73 0.3 undecidable manual P 355 18.9699 102 -0.08 74
IV.NRCA.HHZ. 2021-04-20T03:42:12.20 0.3 undecidable manual P 140 15.7731 109 -0.12 75
IT.MTCL.HGZ. 2021-04-20T03:42:12.74 0.3 undecidable manual S 7 5.6943 148 -0.33 72
IV.CESI.HHZ. 2021-04-20T03:42:11.68 0.1 undecidable manual P 315 9.7791 130 0.15 100
IT.MTCL.HGZ. 2021-04-20T03:42:11.15 0.3 undecidable manual P 7 5.6943 148 0.04 77
IV.FDMO.HHZ. 2021-04-20T03:42:11.95 0.3 undecidable manual P 37 13.0758 117 0.01 77
IV.FEMA.HNZ. 2021-04-20T03:42:11.25 0.3 undecidable manual P 66 5.2947 151 0.17 75
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CESI.HHN. ML:1.3 0.00020050000000000002 0.12 AML other m 2021-04-20T03:42:14.08
IV.CESI.HHE. ML:1.0 0.000127 0.2 AML other m 2021-04-20T03:42:14.09
IV.FDMO.HHE. ML:1.2 0.0001375 0.16 AML other m 2021-04-20T03:42:14.48
IV.FDMO.HHN. ML:1.3 0.00019350000000000001 0.18 AML other m 2021-04-20T03:42:14.48
IV.NRCA.HHE. ML:1.3 0.000179 0.1 AML other m 2021-04-20T03:42:15.49
IV.NRCA.HHN. ML:1.3 0.000154 1.44 AML other m 2021-04-20T03:42:15.73
IV.ASSB.HHN. ML:0.8 0.0000296 0.68 AML other m 2021-04-20T03:42:18.36
IV.ASSB.HHE. ML:0.9 0.0000336 1.34 AML other m 2021-04-20T03:42:18.85
IV.MOMA.HHE. ML:1.0 0.00003595 0.78 AML other m 2021-04-20T03:42:22.79
IV.MOMA.HHN. ML:1.0 0.000036049999999999995 0.54 AML other m 2021-04-20T03:42:22.15
IV.MURB.HHE. ML:1.3 0.000043899999999999996 0.82 AML other m 2021-04-20T03:42:26.80
IV.MURB.HHN. ML:1.3 0.00004654999999999999 1.02 AML other m 2021-04-20T03:42:28.26
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