Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.5 on date 23-12-2023 and time 19:16:45 (Italy) in region 3 km SW Spoleto (PG)

A magnitude ML 1.5 earthquake occured in region: 3 km SW Spoleto (PG), on

  • 23-12-2023 18:16:45 (UTC)
  • 23-12-2023 19:16:45 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.7210, 12.7110 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
Spoleto PG 3 38218 38218
Scheggino PG 10 461 38679
Sant'Anatolia di Narco PG 10 564 39243
Castel Ritaldi PG 12 3278 42521
Campello sul Clitunno PG 12 2442 44963
Ferentillo TR 13 1913 46876
Vallo di Nera PG 14 364 47240
Acquasparta TR 14 4778 52018
Montefranco TR 14 1276 53294
Arrone TR 16 2763 56057
Massa Martana PG 17 3770 59827
Giano dell'Umbria PG 17 3846 63673
Trevi PG 18 8469 72142
San Gemini TR 18 5018 77160
Terni TR 18 111501 188661
Poggiodomo PG 18 117 188778
Polino TR 19 233 189011
Montecastrilli TR 20 5022 194033
Montefalco PG 20 5679 199712

Municipalities with at least 50000 inhabitants

An earthquake occurred to
18 Km N of Terni (111501 inhabitants)
26 Km S of Foligno (57155 inhabitants)
50 Km SE of Perugia (166134 inhabitants)
60 Km NE of Viterbo (67173 inhabitants)
70 Km NW of L'Aquila (69753 inhabitants)
80 Km N of Guidonia Montecelio (88673 inhabitants)
82 Km W of Teramo (54892 inhabitants)
84 Km N of Tivoli (56533 inhabitants)
94 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 1.5 2023-12-23
18:16:45		 42.7208 12.7112 10 2023-12-23
18:21:48		 Sala Sismica INGV-Roma 124225671
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-12-23 18:16:45 ± 0.07
Latitude 42.7208 ± 0.0054
Longitude 12.7112 ± 0.0061
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 124225671

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 567
Semi-minor axis of confidence ellipse (meter) 411
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 222
Circular confidence region, given by single value of horizontal uncertainty (meter) 570.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 90
Number of associated phases, regardless of their use for origin computation 17
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.17
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.41908
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 8
Magnitude information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.2
Num. used stations 31
Type of magnitude ML
Reference to an origin 124225671
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-12-23 18:21:48
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MMO1.EHZ. 2023-12-23T18:17:04.29 3.0 undecidable manual S 0.47 0
IV.LNSS.HHZ. 2023-12-23T18:16:56.44 0.6 undecidable manual S 116 29.8479 50 0.08 49
IV.MGAB.HHZ. 2023-12-23T18:16:56.50 3.0 positive manual P 0.67 0
IV.RM33.EHZ. 2023-12-23T18:16:55.20 3.0 positive manual P 0.38 0
IV.SMA1.EHZ. 2023-12-23T18:16:55.46 3.0 undecidable manual P -0.12 0
IV.FDMO.HHZ. 2023-12-23T18:16:54.52 0.3 undecidable manual P 41 46.5201 50 0.09 71
IV.CESX.HHZ. 2023-12-23T18:16:52.60 0.6 undecidable manual S 219 16.0728 122 0.26 48
IV.ASSB.HHZ. 2023-12-23T18:16:52.86 0.6 undecidable manual P 353 35.9418 50 0.05 48
IV.GAVE.EHZ. 2023-12-23T18:16:52.19 0.6 undecidable manual S 102 15.2736 124 0.08 50
IV.CESI.HHZ. 2023-12-23T18:16:52.86 1.0 undecidable manual P 26 35.2425 50 0.17 24
IV.MOMA.HHE. 2023-12-23T18:16:52.27 0.6 undecidable manual S 309 14.7741 125 0.32 47
IV.NRCA.HHZ. 2023-12-23T18:16:52.62 3.0 negative manual P -0.14 0
IV.LNSS.HHZ. 2023-12-23T18:16:51.76 0.3 undecidable manual P 116 29.8479 50 -0.11 72
IV.CESX.HHZ. 2023-12-23T18:16:49.30 0.6 positive manual P 219 16.0728 122 -0.25 48
IV.GAVE.EHZ. 2023-12-23T18:16:49.35 0.1 negative manual P 102 15.2736 124 -0.06 100
IV.ARRO.EHZ. 2023-12-23T18:16:49.63 0.3 undecidable manual P 164 16.3725 122 0.04 75
IV.MOMA.HHE. 2023-12-23T18:16:48.95 0.3 undecidable manual P 309 14.7741 125 -0.37 70
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.GAVE.EHE. ML:1.7 0.000455 0.26 AML other m 2023-12-23T18:16:53.40
IV.GAVE.EHN. ML:1.5 0.00032004755 0.1664 AML other m 2023-12-23T18:16:52.35
IV.CESX.HHE. ML:1.8 0.0006314441499999999 0.4992 AML other m 2023-12-23T18:16:54.06
IV.ARRO.EHE. ML:1.4 0.00020576815 0.2176 AML other m 2023-12-23T18:16:54.03
IV.CESX.HHN. ML:1.8 0.00060474595 0.2176 AML other m 2023-12-23T18:16:54.08
IV.ARRO.EHN. ML:1.3 0.0001665 0.42 AML other m 2023-12-23T18:16:55.46
IV.LNSS.HHE. ML:1.6 0.00019218825000000001 0.32 AML other m 2023-12-23T18:16:57.61
IV.LNSS.HHN. ML:1.5 0.0001651659 0.3328 AML other m 2023-12-23T18:16:58.45
IV.CESI.HHN. ML:1.5 0.000113 0.26 AML other m 2023-12-23T18:16:58.57
IV.ASSB.HHE. ML:1.2 0.00006499864 0.1536 AML other m 2023-12-23T18:17:00.15
IV.NRCA.HHE. ML:1.4 0.00009015000000000001 0.12 AML other m 2023-12-23T18:16:59.74
IV.NRCA.HHN. ML:1.2 0.000067645845 0.1152 AML other m 2023-12-23T18:17:01.11
IV.ASSB.HHN. ML:1.1 0.000043884004999999996 0.1536 AML other m 2023-12-23T18:17:01.86
IV.CESI.HHE. ML:1.1 0.00005514135050000001 0.2944 AML other m 2023-12-23T18:17:01.98
IV.SMA1.EHE. ML:1.6 0.0001025 0.32 AML other m 2023-12-23T18:17:05.29
IV.SMA1.EHN. ML:1.6 0.000088 0.56 AML other m 2023-12-23T18:17:06.05
IV.GAVE.HNE. ML:1.7 0.00049175555 0.2688 AML other m 2023-12-23T18:16:53.40
IV.LNSS.HNE. ML:1.6 0.000192128 0.3072 AML other m 2023-12-23T18:16:57.61
IV.LNSS.HNN. ML:1.6 0.00018588072999999999 0.3712 AML other m 2023-12-23T18:16:58.47
IV.NRCA.HNE. ML:1.4 0.000093679165 0.1792 AML other m 2023-12-23T18:17:02.42
IV.NRCA.HNN. ML:1.7 0.0001859702 0.6656 AML other m 2023-12-23T18:17:05.50
IV.CESI.HNE. ML:1.5 0.00012322532 0.8576 AML other m 2023-12-23T18:17:10.65
IV.CESI.HNN. ML:1.5 0.000130912095 0.576 AML other m 2023-12-23T18:17:01.21
IV.RM33.EHE. ML:1.2 0.000049760473499999996 0.384 AML other m 2023-12-23T18:17:04.05
IV.RM33.EHN. ML:1.3 0.00005431514 0.576 AML other m 2023-12-23T18:17:07.57
IV.RM33.HNE. ML:1.7 0.00014681853999999999 0.5376 AML other m 2023-12-23T18:17:02.71
IV.RM33.HNN. ML:1.7 0.00013506934 0.4736 AML other m 2023-12-23T18:17:05.20
IV.MGAB.HNE. ML:1.7 0.00011559949 0.8448 AML other m 2023-12-23T18:17:19.16
IV.MGAB.HNN. ML:1.7 0.00011681904 0.5632 AML other m 2023-12-23T18:17:11.41
IV.MGAB.HHE. ML:1.3 0.000048753624999999995 0.2176 AML other m 2023-12-23T18:17:05.43
IV.MGAB.HHN. ML:1.3 0.00004856825 0.1792 AML other m 2023-12-23T18:17:05.02
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