Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 20-04-2023 and time 15:08:12 (Italy) in region 2 km W Sellano (PG)

A magnitude ML 1.1 earthquake occured in region: 2 km W Sellano (PG), on

  • 20-04-2023 13:08:12 (UTC)
  • 20-04-2023 15:08:12 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8830, 12.9040 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
Sellano PG 2 1079 1079
Cerreto di Spoleto PG 7 1075 2154
Preci PG 11 724 2878
Campello sul Clitunno PG 12 2442 5320
Trevi PG 13 8469 13789
Vallo di Nera PG 13 364 14153
Monte Cavallo MC 15 145 14298
Visso MC 16 1107 15405
Sant'Anatolia di Narco PG 18 564 15969
Foligno PG 18 57155 73124
Norcia PG 18 4957 78081
Poggiodomo PG 19 117 78198
Scheggino PG 20 461 78659
Castel Ritaldi PG 20 3278 81937

Municipalities with at least 50000 inhabitants

An earthquake occurred to
18 Km E of Foligno (57155 inhabitants)
41 Km NE of Terni (111501 inhabitants)
49 Km SE of Perugia (166134 inhabitants)
70 Km W of Teramo (54892 inhabitants)
72 Km NW of L'Aquila (69753 inhabitants)
83 Km NE of Viterbo (67173 inhabitants)
96 Km SW of Ancona (100861 inhabitants)
99 Km N of Guidonia Montecelio (88673 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 2023-04-20
13:08:12		 42.8833 12.9038 12 2023-04-20
13:20:39		 Sala Sismica INGV-Roma 116550401
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-04-20 13:08:12 ± 0.05
Latitude 42.8833 ± 0.0027
Longitude 12.9038 ± 0.0049
Depth (km) 12 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 116550401

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 406
Semi-minor axis of confidence ellipse (meter) 161
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 283
Circular confidence region, given by single value of horizontal uncertainty (meter) 410.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 70
Number of associated phases, regardless of their use for origin computation 26
Number of defining phases 20
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.30307
Number of stations at which the event was observed 16
Number of stations from which data was used for origin computation 10
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 18
Type of magnitude ML
Reference to an origin 116550401
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-04-20 13:20:39
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.GIUL.HHZ. 2023-04-20T13:08:57.00 3.0 undecidable manual S 4.22 0
IV.VVLD.HHZ. 2023-04-20T13:08:47.48 3.0 undecidable manual S -0.53 0
IV.SSFR.HHZ. 2023-04-20T13:08:33.06 3.0 undecidable manual S 0.73 0
IV.RCAV.EHZ. 2023-04-20T13:08:30.15 3.0 undecidable manual P -0.14 0
IV.ARVD.HHZ. 2023-04-20T13:08:26.19 3.0 positive manual P 1.9 0
IV.CSP1.EHZ. 2023-04-20T13:08:24.34 0.1 undecidable manual S 46 33.6441 92 0.24 93
IV.LNSS.HHZ. 2023-04-20T13:08:23.83 0.1 undecidable manual S 160 33.0447 93 -0.12 94
IV.MOMA.HHZ. 2023-04-20T13:08:22.79 0.3 undecidable manual S 252 28.5492 93 0.04 73
IV.MML1.EHZ. 2023-04-20T13:08:22.17 0.3 undecidable manual S 12 26.1516 94 0.07 73
IV.EL6.EHZ. 2023-04-20T13:08:22.21 3.0 negative manual P 0.39 0
IV.FDMO.HHZ. 2023-04-20T13:08:21.00 0.3 undecidable manual S 41 22.5552 95 -0.16 71
IV.ASSB.HHZ. 2023-04-20T13:08:21.88 0.3 undecidable manual S 312 26.5512 94 -0.35 68
IV.GAVE.EHZ. 2023-04-20T13:08:20.65 0.3 undecidable manual S 182 21.2676 96 -0.15 71
IV.FEMA.HNZ. 2023-04-20T13:08:19.11 0.3 undecidable manual S 54 14.6742 107 0.01 75
IV.CSP1.EHZ. 2023-04-20T13:08:19.34 0.1 undecidable manual P 46 33.6441 92 0.07 96
IV.MOMA.HHZ. 2023-04-20T13:08:19.31 0.3 undecidable manual P 252 28.5492 93 0.82 59
IV.NRCA.HHZ. 2023-04-20T13:08:19.92 0.3 undecidable manual S 108 17.9709 100 -0.02 74
IV.LNSS.HHZ. 2023-04-20T13:08:19.09 0.3 undecidable manual P 160 33.0447 93 -0.09 71
IV.CESI.HHZ. 2023-04-20T13:08:18.68 0.1 undecidable manual S 0 13.4754 112 -0.1 97
IV.ASSB.HHZ. 2023-04-20T13:08:18.04 0.3 undecidable manual P 312 26.5512 94 -0.15 71
IV.MML1.EHZ. 2023-04-20T13:08:18.10 0.1 undecidable manual P 12 26.1516 94 -0.01 97
IV.GAVE.EHZ. 2023-04-20T13:08:17.26 0.3 undecidable manual P 182 21.2676 96 -0.1 72
IV.FDMO.HHZ. 2023-04-20T13:08:17.53 0.1 undecidable manual P 41 22.5552 95 -0.04 97
IV.FEMA.HNZ. 2023-04-20T13:08:16.51 0.3 undecidable manual P 54 14.6742 107 0.14 73
IV.CESI.HHZ. 2023-04-20T13:08:16.23 0.1 undecidable manual P 0 13.4754 112 0.04 100
IV.NRCA.HHZ. 2023-04-20T13:08:16.83 0.1 negative manual P 108 17.9709 100 -0.04 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CESI.HHE. ML:1.1 0.00011595 0.26 AML other m 2023-04-20T13:08:18.91
IV.CESI.HHN. ML:1.2 0.00014350000000000002 0.3 AML other m 2023-04-20T13:08:19.18
IV.NRCA.HHN. ML:1.0 0.00007939999999999999 1.58 AML other m 2023-04-20T13:08:20.11
IV.NRCA.HHE. ML:1.1 0.00010385 0.1 AML other m 2023-04-20T13:08:20.27
IV.GAVE.EHE. ML:1.5 0.000221 0.32 AML other m 2023-04-20T13:08:20.81
IV.FDMO.HHN. ML:0.9 0.000049600000000000006 0.18 AML other m 2023-04-20T13:08:21.39
IV.GAVE.EHN. ML:1.5 0.0001885 0.54 AML other m 2023-04-20T13:08:21.77
IV.FDMO.HHE. ML:1.0 0.000057499999999999995 0.22 AML other m 2023-04-20T13:08:21.60
IV.ASSB.HHN. ML:1.1 0.0000656 0.42 AML other m 2023-04-20T13:08:22.26
IV.MML1.EHN. ML:0.8 0.00003665 0.18 AML other m 2023-04-20T13:08:22.42
IV.ASSB.HHE. ML:1.0 0.000054099999999999994 0.52 AML other m 2023-04-20T13:08:22.33
IV.MML1.EHE. ML:0.8 0.000036450000000000005 0.66 AML other m 2023-04-20T13:08:23.10
IV.LNSS.HHE. ML:1.1 0.000054800000000000004 0.14 AML other m 2023-04-20T13:08:24.44
IV.LNSS.HHN. ML:1.1 0.00005645 0.26 AML other m 2023-04-20T13:08:24.65
IV.ARVD.HHE. ML:1.2 0.000029049999999999998 0.98 AML other m 2023-04-20T13:08:27.10
IV.SSFR.HHN. ML:1.0 0.000019900000000000003 0.82 AML other m 2023-04-20T13:08:33.87
IV.SSFR.HHE. ML:1.1 0.00002325 0.66 AML other m 2023-04-20T13:08:34.84
IV.ARVD.HHN. ML:0.9 0.0000143 0.34 AML other m 2023-04-20T13:08:35.59
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