Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.0 on date 07-12-2023 and time 01:12:47 (UTC) in region 3 km E Spoleto (PG)

A magnitude ML 1.0 earthquake occured in region: 3 km E Spoleto (PG), on

  • 07-12-2023 01:12:47 (UTC)
  • 07-12-2023 02:12:47 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.7480, 12.7720 at 8 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
Spoleto PG 3 38218 38218
Sant'Anatolia di Narco PG 6 564 38782
Scheggino PG 6 461 39243
Vallo di Nera PG 8 364 39607
Campello sul Clitunno PG 8 2442 42049
Castel Ritaldi PG 12 3278 45327
Poggiodomo PG 14 117 45444
Ferentillo TR 14 1913 47357
Cerreto di Spoleto PG 14 1075 48432
Trevi PG 15 8469 56901
Montefranco TR 17 1276 58177
Arrone TR 18 2763 60940
Monteleone di Spoleto PG 18 599 61539
Giano dell'Umbria PG 19 3846 65385
Montefalco PG 19 5679 71064
Polino TR 19 233 71297
Acquasparta TR 19 4778 76075

Municipalities with at least 50000 inhabitants

An earthquake occurred to
23 Km NE of Terni (111501 inhabitants)
24 Km S of Foligno (57155 inhabitants)
51 Km SE of Perugia (166134 inhabitants)
66 Km NE of Viterbo (67173 inhabitants)
68 Km NW of L'Aquila (69753 inhabitants)
77 Km W of Teramo (54892 inhabitants)
83 Km N of Guidonia Montecelio (88673 inhabitants)
87 Km N of Tivoli (56533 inhabitants)
98 Km N of Roma (2864731 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 1.0 2023-12-07
01:12:47		 42.7478 12.7725 8 2023-12-07
02:02:29		 Sala Sismica INGV-Roma 123863131
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-12-07 01:12:47 ± 0.12
Latitude 42.7478 ± 0.0063
Longitude 12.7725 ± 0.0061
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 123863131

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 577
Semi-minor axis of confidence ellipse (meter) 517
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 206
Circular confidence region, given by single value of horizontal uncertainty (meter) 580.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 98
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 15
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.27
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.42988
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 8
Magnitude information

ML:1.0

Field Value
Value 1.0
Uncertainty 0.0
Num. used stations 2
Type of magnitude ML
Reference to an origin 123863131
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-12-07 02:02:29
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.GIUL.HHZ. 2023-12-07T01:13:06.23 3.0 positive manual Pg 0.02 0
IV.FDMO.HHN. 2023-12-07T01:13:01.77 0.6 undecidable manual S 39 41.0256 50 -0.08 50
IV.ASSB.HHZ. 2023-12-07T01:13:00.18 0.6 undecidable manual S 344 33.9438 103 0.27 48
IV.NRCA.HHZ. 2023-12-07T01:12:58.52 0.6 undecidable manual S 71 29.3484 105 0.15 50
IV.LNSS.HHZ. 2023-12-07T01:12:57.90 0.6 undecidable manual S 126 27.1506 107 0.29 49
IV.SMA1.EHZ. 2023-12-07T01:12:56.98 0.3 undecidable manual P 106 47.7189 50 0.04 74
IV.FDMO.HHN. 2023-12-07T01:12:56.18 0.3 undecidable manual P 39 41.0256 50 0.28 71
IV.CESX.HHZ. 2023-12-07T01:12:55.82 0.6 undecidable manual S 224 21.6672 111 0.01 52
IV.MOMA.HHZ. 2023-12-07T01:12:54.60 0.3 undecidable manual S 291 17.6712 115 0.08 77
IV.ASSB.HHZ. 2023-12-07T01:12:53.09 1.0 undecidable manual P 344 33.9438 103 -1.7 13
IV.NRCA.HHZ. 2023-12-07T01:12:53.77 0.1 undecidable manual P 71 29.3484 105 -0.13 100
IV.LNSS.HHZ. 2023-12-07T01:12:52.84 0.3 undecidable manual P 126 27.1506 107 -0.62 66
IV.GAVE.HNN. 2023-12-07T01:12:52.79 0.3 undecidable manual S 122 11.6772 125 0.06 78
IV.CESX.HHZ. 2023-12-07T01:12:52.99 1.0 undecidable manual P 224 21.6672 111 0.57 23
IV.MOMA.HHZ. 2023-12-07T01:12:51.52 0.3 undecidable manual P 291 17.6712 115 -0.16 76
IV.GAVE.HNN. 2023-12-07T01:12:50.77 0.3 undecidable manual P 122 11.6772 125 0.13 77
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:1.0 0.0000535 0.12 AML other m 2023-12-07T01:12:58.63
IV.NRCA.HHE. ML:1.0 0.0000552 0.44 AML other m 2023-12-07T01:12:59.95
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