Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 27-04-2023 and time 17:20:37 (Italy) in region 4 km W Vallo di Nera (PG)

A magnitude ML 0.9 earthquake occured in region: 4 km W Vallo di Nera (PG), on

  • 27-04-2023 15:20:37 (UTC)
  • 27-04-2023 17:20:37 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7680, 12.8110 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
Vallo di Nera PG 4 364 364
Sant'Anatolia di Narco PG 4 564 928
Scheggino PG 6 461 1389
Campello sul Clitunno PG 7 2442 3831
Spoleto PG 7 38218 42049
Cerreto di Spoleto PG 11 1075 43124
Poggiodomo PG 12 117 43241
Castel Ritaldi PG 13 3278 46519
Trevi PG 13 8469 54988
Ferentillo TR 16 1913 56901
Sellano PG 17 1079 57980
Monteleone di Spoleto PG 17 599 58579
Cascia PG 18 3217 61796
Montefalco PG 19 5679 67475
Montefranco TR 19 1276 68751

Municipalities with at least 50000 inhabitants

An earthquake occurred to
23 Km SE of Foligno (57155 inhabitants)
27 Km NE of Terni (111501 inhabitants)
51 Km SE of Perugia (166134 inhabitants)
67 Km NW of L'Aquila (69753 inhabitants)
70 Km NE of Viterbo (67173 inhabitants)
74 Km W of Teramo (54892 inhabitants)
86 Km N of Guidonia Montecelio (88673 inhabitants)
89 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 0.9 2023-04-27
15:20:37		 42.7678 12.8108 10 2023-04-27
15:26:07		 Sala Sismica INGV-Roma 116805021
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-04-27 15:20:37 ± 0.05
Latitude 42.7678 ± 0.0036
Longitude 12.8108 ± 0.0049
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 116805021

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 488
Semi-minor axis of confidence ellipse (meter) 333
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 221
Circular confidence region, given by single value of horizontal uncertainty (meter) 490.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 92
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) 0.14
Epicentral distance of station closest to the epicenter (degree) 0.09713
Epicentral distance of station farthest from the epicenter (degree) 0.43347
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 12
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.2
Num. used stations 16
Type of magnitude ML
Reference to an origin 116805021
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-04-27 15:26:07
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CSP1.EHZ. 2023-04-27T15:20:52.53 0.6 undecidable manual S 42 48.1185 50 0.01 47
IV.MMO1.EHZ. 2023-04-27T15:20:51.62 0.3 undecidable manual S 71 44.4222 50 0.09 70
IV.MML1.EHZ. 2023-04-27T15:20:50.95 0.6 undecidable manual S 19 40.5261 50 0.47 43
IV.FDMO.HHZ. 2023-04-27T15:20:49.96 0.6 undecidable manual S 37 37.3293 50 0.33 45
IV.ASSB.HHZ. 2023-04-27T15:20:48.33 0.6 undecidable manual S 338 32.8449 50 -0.12 47
IV.FEMA.HNN. 2023-04-27T15:20:47.49 0.6 undecidable manual S 42 29.0487 50 0.07 48
IV.LNSS.HHZ. 2023-04-27T15:20:46.56 0.6 undecidable manual S 134 26.1516 50 -0.1 48
IV.CSP1.EHZ. 2023-04-27T15:20:46.12 0.6 negative manual P 42 48.1185 50 0.14 46
IV.NRCA.HHZ. 2023-04-27T15:20:46.49 0.6 undecidable manual S 73 25.752 50 -0.06 48
IV.CESI.HHZ. 2023-04-27T15:20:46.98 0.6 undecidable manual S 16 27.3504 50 0 49
IV.ARRO.EHZ. 2023-04-27T15:20:45.35 0.6 undecidable manual S 190 21.2676 116 0.08 49
IV.MMO1.EHZ. 2023-04-27T15:20:45.10 0.1 undecidable manual P 71 44.4222 50 -0.32 89
IV.MML1.EHZ. 2023-04-27T15:20:44.83 0.6 positive manual P 19 40.5261 50 0.02 48
IV.FDMO.HHZ. 2023-04-27T15:20:44.32 1.0 negative manual P 37 37.3293 50 0 24
IV.ASSB.HHZ. 2023-04-27T15:20:43.58 0.3 undecidable manual P 338 32.8449 50 -0.06 72
IV.CESI.HHZ. 2023-04-27T15:20:42.80 0.1 positive manual P 16 27.3504 50 0.01 97
IV.FEMA.HNN. 2023-04-27T15:20:42.71 0.1 undecidable manual P 42 29.0487 50 -0.33 91
IV.LNSS.HHZ. 2023-04-27T15:20:42.82 0.6 undecidable manual P 134 26.1516 50 0.22 47
IV.GAVE.HNZ. 2023-04-27T15:20:42.23 0.6 undecidable manual S 141 10.7781 134 -0.03 50
IV.NRCA.HHZ. 2023-04-27T15:20:42.52 0.6 undecidable manual P 73 25.752 50 -0.02 49
IV.ARRO.EHZ. 2023-04-27T15:20:41.96 0.3 positive manual P 190 21.2676 116 0.16 72
IV.MOMA.HHZ. 2023-04-27T15:20:41.55 0.1 undecidable manual P 282 19.9689 117 -0.03 98
IV.GAVE.HNZ. 2023-04-27T15:20:40.09 0.1 undecidable manual P 141 10.7781 134 0.03 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ARRO.EHE. ML:0.8 0.000044649999999999994 0.7 AML other m 2023-04-27T15:20:45.30
IV.ARRO.EHN. ML:0.8 0.000041599999999999995 0.32 AML other m 2023-04-27T15:20:45.56
IV.LNSS.HHN. ML:1.1 0.00006395000000000001 0.92 AML other m 2023-04-27T15:20:46.14
IV.CESI.HHN. ML:1.2 0.0000809 0.58 AML other m 2023-04-27T15:20:47.07
IV.NRCA.HHE. ML:0.9 0.000047149999999999994 0.56 AML other m 2023-04-27T15:20:47.28
IV.LNSS.HHE. ML:1.0 0.00005305 0.6 AML other m 2023-04-27T15:20:47.68
IV.NRCA.HHN. ML:0.9 0.0000462 0.14 AML other m 2023-04-27T15:20:48.55
IV.ASSB.HHE. ML:0.8 0.0000256 0.22 AML other m 2023-04-27T15:20:49.26
IV.ASSB.HHN. ML:0.8 0.00002465 0.76 AML other m 2023-04-27T15:20:49.54
IV.CESI.HHE. ML:0.8 0.000032500000000000004 0.5 AML other m 2023-04-27T15:20:49.61
IV.FDMO.HHE. ML:0.7 0.000018200000000000002 1.7 AML other m 2023-04-27T15:20:50.86
IV.FDMO.HHN. ML:0.7 0.00001835 1.32 AML other m 2023-04-27T15:20:50.29
IV.MML1.EHN. ML:1.0 0.000031899999999999996 0.16 AML other m 2023-04-27T15:20:51.04
IV.MML1.EHE. ML:0.8 0.000022349999999999998 1.46 AML other m 2023-04-27T15:20:51.94
IV.FOSV.EHE. ML:1.6 0.00008575 1.02 AML other m 2023-04-27T15:21:11.90
IV.FOSV.EHN. ML:1.6 0.000089 0.7 AML other m 2023-04-27T15:21:12.62
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