Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.0 on date 07-02-2023 and time 04:50:28 (UTC) in region 4 km N Spoleto (PG)

A magnitude ML 1.0 earthquake occured in region: 4 km N Spoleto (PG), on

  • 07-02-2023 04:50:28 (UTC)
  • 07-02-2023 05:50:28 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.7760, 12.7440 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 5 38218 38218
Campello sul Clitunno PG 6 2442 40660
Castel Ritaldi PG 8 3278 43938
Sant'Anatolia di Narco PG 9 564 44502
Vallo di Nera PG 10 364 44866
Scheggino PG 10 461 45327
Trevi PG 11 8469 53796
Giano dell'Umbria PG 15 3846 57642
Cerreto di Spoleto PG 15 1075 58717
Montefalco PG 15 5679 64396
Poggiodomo PG 17 117 64513
Ferentillo TR 18 1913 66426
Massa Martana PG 18 3770 70196
Acquasparta TR 19 4778 74974
Sellano PG 20 1079 76053
Montefranco TR 20 1276 77329

Municipalities with at least 50000 inhabitants

An earthquake occurred to
20 Km S of Foligno (57155 inhabitants)
25 Km NE of Terni (111501 inhabitants)
47 Km SE of Perugia (166134 inhabitants)
66 Km NE of Viterbo (67173 inhabitants)
71 Km NW of L'Aquila (69753 inhabitants)
80 Km W of Teramo (54892 inhabitants)
86 Km N of Guidonia Montecelio (88673 inhabitants)
90 Km N of Tivoli (56533 inhabitants)
100 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 2023-02-07
04:50:28		 42.7757 12.7437 8 2023-02-07
05:01:57		 Sala Sismica INGV-Roma 114205921
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-02-07 04:50:28 ± 0.06
Latitude 42.7757 ± 0.0036
Longitude 12.7437 ± 0.0049
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 114205921

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 402
Semi-minor axis of confidence ellipse (meter) 272
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 347
Circular confidence region, given by single value of horizontal uncertainty (meter) 400.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 99
Number of associated phases, regardless of their use for origin computation 23
Number of defining phases 22
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.24
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.57736
Number of stations at which the event was observed 15
Number of stations from which data was used for origin computation 14
Magnitude information

ML:1.0

Field Value
Value 1.0
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 114205921
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-02-07 05:01:57
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MURB.HHZ. 2023-02-07T04:50:45.70 3.0 undecidable manual S -0.56 0
IV.MMO1.EHZ. 2023-02-07T04:50:44.74 0.3 undecidable manual S 74 49.4172 50 0.27 68
IV.FIAM.HNN. 2023-02-07T04:50:40.03 0.3 undecidable manual P 151 64.0914 50 0.19 68
IV.NRCA.HHZ. 2023-02-07T04:50:39.31 0.3 undecidable manual S 78 30.8469 105 0.08 73
IV.LNSS.HHZ. 2023-02-07T04:50:39.23 0.3 undecidable manual S 128 30.8469 105 -0.01 75
IV.CESI.HHZ. 2023-02-07T04:50:38.67 0.6 undecidable manual S 27 28.5492 106 0.19 48
IV.MGAB.HNE. 2023-02-07T04:50:38.73 0.1 undecidable manual P 287 53.6019 50 0.5 86
IV.CSP1.EHZ. 2023-02-07T04:50:37.85 0.3 undecidable manual P 47 51.3153 50 -0.03 72
IV.MMO1.EHZ. 2023-02-07T04:50:37.48 0.1 undecidable manual P 74 49.4172 50 -0.1 94
IV.RM33.EHZ. 2023-02-07T04:50:37.19 0.3 undecidable manual P 127 48.5181 50 -0.25 69
IV.FDMO.HHZ. 2023-02-07T04:50:36.00 0.3 undecidable manual P 44 40.2264 50 -0.17 71
IV.ARRO.EHZ. 2023-02-07T04:50:36.53 0.3 undecidable manual S 175 21.867 110 0.27 72
IV.MML1.EHZ. 2023-02-07T04:50:35.74 0.3 undecidable manual P 26 41.8248 50 -0.67 62
IV.CESX.HHZ. 2023-02-07T04:50:35.80 0.6 undecidable manual S 215 22.5552 110 -0.67 43
IV.LNSS.HHZ. 2023-02-07T04:50:34.47 0.1 undecidable manual P 128 30.8469 105 -0.09 98
IV.NRCA.HHZ. 2023-02-07T04:50:34.48 0.3 undecidable manual P 78 30.8469 105 -0.07 74
IV.CESI.HHZ. 2023-02-07T04:50:34.16 0.1 undecidable manual P 27 28.5492 106 0.04 99
IT.GNU.HGZ. 2023-02-07T04:50:33.98 0.3 undecidable manual S 283 14.4744 119 0.07 76
IV.MOMA.HHZ. 2023-02-07T04:50:33.77 0.3 undecidable manual S 283 14.4744 119 -0.14 75
IV.ARRO.EHZ. 2023-02-07T04:50:33.14 0.3 undecidable manual P 175 21.867 110 0.3 71
IV.CESX.HHZ. 2023-02-07T04:50:32.75 0.3 undecidable manual P 215 22.5552 110 -0.21 73
IV.MOMA.HHZ. 2023-02-07T04:50:31.49 0.3 undecidable manual P 283 14.4744 119 0 77
IT.GNU.HGZ. 2023-02-07T04:50:31.60 0.1 undecidable manual P 283 14.4744 119 0.12 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MOMA.HHE. ML:1.6 0.00040265885000000004 0.1824 AML other m 2023-02-07T04:50:34.33
IV.MOMA.HHN. ML:1.2 0.00016646945 0.1408 AML other m 2023-02-07T04:50:34.53
IV.MOMA.HNE. ML:1.6 0.00037426195 0.1792 AML other m 2023-02-07T04:50:34.34
IV.MOMA.HNN. ML:1.2 0.00017854020000000002 0.192 AML other m 2023-02-07T04:50:34.63
IV.CESX.HHE. ML:0.9 0.00005053423 0.16 AML other m 2023-02-07T04:50:36.89
IV.CESX.HHN. ML:0.9 0.000053998845000000005 0.2784 AML other m 2023-02-07T04:50:36.89
IV.ARRO.EHN. ML:0.8 0.000038096489999999996 0.2624 AML other m 2023-02-07T04:50:41.83
IV.CESI.HHN. ML:0.9 0.000039522349999999996 0.2208 AML other m 2023-02-07T04:50:38.94
IV.NRCA.HHE. ML:1.1 0.0000608581765 0.16 AML other m 2023-02-07T04:50:40.71
IV.NRCA.HHN. ML:0.8 0.000030530195 0.0992 AML other m 2023-02-07T04:50:39.91
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