Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.7 on date 24-02-2023 and time 19:38:04 (Italy) in region 6 km NW Proceno (VT)

A magnitude ML 0.7 earthquake occured in region: 6 km NW Proceno (VT), on

  • 24-02-2023 18:38:04 (UTC)
  • 24-02-2023 19:38:04 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.8050, 11.7850 at 8 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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
Proceno VT 6 557 557
Castell'Azzara GR 8 1476 2033
Piancastagnaio SI 9 4230 6263
Acquapendente VT 9 5506 11769
Radicofani SI 11 1097 12866
San Casciano dei Bagni SI 11 1632 14498
Abbadia San Salvatore SI 12 6444 20942
Onano VT 13 995 21937
Sorano GR 15 3428 25365
Allerona TR 16 1794 27159
Grotte di Castro VT 16 2683 29842
Santa Fiora GR 17 2622 32464
San Lorenzo Nuovo VT 17 2091 34555
Castel Viscardo TR 19 2938 37493
Gradoli VT 19 1353 38846
Castel Giorgio TR 19 2131 40977
Fabro TR 20 2876 43853
Latera VT 20 836 44689

Municipalities with at least 50000 inhabitants

An earthquake occurred to
50 Km NW of Viterbo (67173 inhabitants)
55 Km E of Grosseto (82087 inhabitants)
60 Km SW of Perugia (166134 inhabitants)
68 Km SE of Siena (53903 inhabitants)
74 Km S of Arezzo (99543 inhabitants)
76 Km W of Terni (111501 inhabitants)
77 Km W of Foligno (57155 inhabitants)
79 Km N of Civitavecchia (52991 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
Bulletin
Rev1000 		ML 0.7 2023-02-24
18:38:04		 42.8047 11.7853 8 2024-03-01
17:17:59		 Bollettino Sismico Italiano INGV 115394581
Reviewed
Rev100 		ML 0.9 2023-02-24
18:38:05		 42.8113 11.7872 6 2023-02-24
18:43:37		 Sala Sismica INGV-Roma 114770971
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-02-24 18:38:04 ± 0.14
Latitude 42.8047 ± 0.0036
Longitude 11.7853 ± 0.0037
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 115394581

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 408
Semi-minor axis of confidence ellipse (meter) 130
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 174
Circular confidence region, given by single value of horizontal uncertainty (meter) 410.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 115
Number of associated phases, regardless of their use for origin computation 12
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.15
Epicentral distance of station closest to the epicenter (degree) 0.08364
Epicentral distance of station farthest from the epicenter (degree) 0.26260
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitudes information

ML:0.7

Field Value
Value 0.7
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 115394581
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2023-03-15 14:41:34

ML:0.9

Field Value
Value 0.9
Uncertainty 0.4
Num. used stations 6
Type of magnitude ML
Reference to an origin 114770971
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-02-24 18:43:37
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MGAB.HHZ. 2023-02-24T18:38:15.21 0.6 undecidable manual S 66 29.1486 106 -0.24 47
IV.ARCI.HHZ. 2023-02-24T18:38:14.15 0.6 undecidable manual S 282 25.752 107 -0.17 48
IV.LATE.HHN. 2023-02-24T18:38:12.65 0.6 undecidable manual S 176 21.2676 111 -0.19 48
IV.MGAB.HHZ. 2023-02-24T18:38:10.91 0.3 undecidable manual P 66 29.1486 106 -0.11 72
IV.ARCI.HHZ. 2023-02-24T18:38:10.45 0.3 undecidable manual P 282 25.752 107 0.09 73
IV.MCIV.CHZ. 2023-02-24T18:38:09.19 0.6 undecidable manual S 252 9.2796 131 -0.05 50
IV.LATE.HHN. 2023-02-24T18:38:09.53 0.3 undecidable manual P 176 21.2676 111 0.03 74
IV.SACS.HHZ. 2023-02-24T18:38:09.99 0.6 undecidable manual S 64 11.2776 126 0.23 48
TV.SF11.HHZ. 2023-02-24T18:38:09.55 0.3 undecidable manual S 309 11.1777 126 -0.2 73
IV.SACS.HHZ. 2023-02-24T18:38:07.80 0.1 undecidable manual P 64 11.2776 126 0.06 100
TV.SF11.HHZ. 2023-02-24T18:38:07.89 0.3 undecidable manual P 309 11.1777 126 0.17 73
IV.MCIV.CHZ. 2023-02-24T18:38:07.59 0.1 undecidable manual P 252 9.2796 131 0.17 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MCIV.CHN. ML:0.9 0.00011064999999999999 1.2 AML other m 2023-02-24T18:38:09.99
IV.MCIV.CHE. ML:0.9 0.000122 0.94 AML other m 2023-02-24T18:38:10.58
IV.SACS.HHN. ML:0.8 0.00007544999999999999 0.26 AML other m 2023-02-24T18:38:12.21
IV.SACS.HHE. ML:0.8 0.0000738 0.64 AML other m 2023-02-24T18:38:12.45
IV.ARCI.HHN. ML:0.2 0.0000111951175 0.2432 AML other m 2023-02-24T18:38:14.75
IV.ARCI.HHE. ML:0.6 0.000025787690000000003 0.192 AML other m 2023-02-24T18:38:15.48
IV.MGAB.HHE. ML:0.6 0.000017634665 0.1792 AML other m 2023-02-24T18:38:18.60
IV.MGAB.HHN. ML:0.6 0.000018764165499999998 0.32 AML other m 2023-02-24T18:38:21.64
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