Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.8 on date 20-04-2023 and time 10:26:54 (UTC) in region 4 km N Poggiodomo (PG)

A magnitude ML 0.8 earthquake occured in region: 4 km N Poggiodomo (PG), on

  • 20-04-2023 10:26:54 (UTC)
  • 20-04-2023 12:26:54 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7460, 12.9340 at 11 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
Poggiodomo PG 4 117 117
Vallo di Nera PG 6 364 481
Cascia PG 7 3217 3698
Sant'Anatolia di Narco PG 8 564 4262
Cerreto di Spoleto PG 8 1075 5337
Scheggino PG 9 461 5798
Monteleone di Spoleto PG 11 599 6397
Norcia PG 14 4957 11354
Campello sul Clitunno PG 15 2442 13796
Spoleto PG 16 38218 52014
Sellano PG 16 1079 53093
Preci PG 17 724 53817
Ferentillo TR 18 1913 55730
Polino TR 19 233 55963

Municipalities with at least 50000 inhabitants

An earthquake occurred to
30 Km SE of Foligno (57155 inhabitants)
31 Km NE of Terni (111501 inhabitants)
58 Km NW of L'Aquila (69753 inhabitants)
60 Km SE of Perugia (166134 inhabitants)
64 Km W of Teramo (54892 inhabitants)
77 Km E of Viterbo (67173 inhabitants)
85 Km N of Guidonia Montecelio (88673 inhabitants)
88 Km N of Tivoli (56533 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 0.8 2023-04-20
10:26:54		 42.7455 12.9342 11 2023-04-20
10:37:19		 Sala Sismica INGV-Roma 116546751
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-04-20 10:26:54 ± 0.09
Latitude 42.7455 ± 0.0036
Longitude 12.9342 ± 0.0049
Depth (km) 11 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 116546751

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 390
Semi-minor axis of confidence ellipse (meter) 360
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 194
Circular confidence region, given by single value of horizontal uncertainty (meter) 390.0
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 10
Number of defining phases 10
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.1
Epicentral distance of station closest to the epicenter (degree) 0.06115
Epicentral distance of station farthest from the epicenter (degree) 0.31206
Number of stations at which the event was observed 5
Number of stations from which data was used for origin computation 5
Magnitude information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 116546751
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-04-20 10:37:19
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.FDMO.HHZ. 2023-04-20T10:27:06.07 0.6 undecidable manual S 21 34.6431 91 -0.09 47
7F.SIB1.EHZ. 2023-04-20T10:27:05.51 0.3 undecidable manual S 59 31.9458 91 0.06 73
IV.CESI.HHZ. 2023-04-20T10:27:04.61 0.6 undecidable manual S 355 28.8489 91 -0.02 49
IV.FDMO.HHZ. 2023-04-20T10:27:01.15 0.6 positive manual P 21 34.6431 91 -0.07 48
IV.LNSS.HHZ. 2023-04-20T10:27:01.58 0.6 undecidable manual S 151 18.0708 94 -0.16 48
IV.CESI.HHZ. 2023-04-20T10:27:00.37 0.3 positive manual P 355 28.8489 91 0.04 74
7F.SIB1.EHZ. 2023-04-20T10:27:00.78 0.1 undecidable manual P 59 31.9458 91 -0.03 97
IV.GAVE.EHZ. 2023-04-20T10:26:58.88 0.6 undecidable manual S 209 6.7932 139 -0.16 50
IV.LNSS.HHZ. 2023-04-20T10:26:58.71 0.1 undecidable manual P 151 18.0708 94 0.05 100
IV.GAVE.EHZ. 2023-04-20T10:26:57.34 0.6 negative manual P 209 6.7932 139 0.24 49
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.GAVE.EHN. ML:1.5 0.0004165 0.56 AML other m 2023-04-20T10:26:59.17
IV.GAVE.EHE. ML:1.3 0.000294 1.08 AML other m 2023-04-20T10:26:59.04
IV.LNSS.HHN. ML:0.9 0.00006275 0.42 AML other m 2023-04-20T10:27:02.30
IV.LNSS.HHE. ML:1.0 0.00006850000000000001 0.12 AML other m 2023-04-20T10:27:02.15
IV.CESI.HHE. ML:0.5 0.00001618 0.8 AML other m 2023-04-20T10:27:04.92
IV.CESI.HHN. ML:0.7 0.00002685 0.3 AML other m 2023-04-20T10:27:04.77
IV.FDMO.HHN. ML:0.4 0.00001205 0.2 AML other m 2023-04-20T10:27:06.29
IV.FDMO.HHE. ML:0.6 0.00001425 0.72 AML other m 2023-04-20T10:27:06.22
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