Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.3 on date 18-02-2024 and time 13:30:28 (Italy) in region 4 km E Santa Fiora (GR)

A magnitude ML 1.3 earthquake occured in region: 4 km E Santa Fiora (GR), on

  • 18-02-2024 12:30:28 (UTC)
  • 18-02-2024 13:30:28 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.8430, 11.6380 at 6 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
Santa Fiora GR 4 2622 2622
Piancastagnaio SI 5 4230 6852
Abbadia San Salvatore SI 5 6444 13296
Arcidosso GR 9 4285 17581
Castell'Azzara GR 9 1476 19057
Castel del Piano GR 10 4690 23747
Seggiano GR 12 961 24708
Radicofani SI 12 1097 25805
Roccalbegna GR 12 1044 26849
Semproniano GR 15 1059 27908
Castiglione d'Orcia SI 18 2346 30254
Proceno VT 18 557 30811
Sorano GR 19 3428 34239
San Casciano dei Bagni SI 20 1632 35871

Municipalities with at least 50000 inhabitants

An earthquake occurred to
44 Km E of Grosseto (82087 inhabitants)
59 Km SE of Siena (53903 inhabitants)
61 Km NW of Viterbo (67173 inhabitants)
68 Km W of Perugia (166134 inhabitants)
72 Km S of Arezzo (99543 inhabitants)
84 Km N of Civitavecchia (52991 inhabitants)
88 Km W of Foligno (57155 inhabitants)
88 Km W of Terni (111501 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 1.3 2024-02-18
12:30:28		 42.8427 11.6385 6 2024-02-18
12:35:24		 Sala Sismica INGV-Roma 125355551
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2024-02-18 12:30:28 ± 0.1
Latitude 42.8427 ± 0.0027
Longitude 11.6385 ± 0.0037
Depth (km) 6 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 125355551

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 312
Semi-minor axis of confidence ellipse (meter) 151
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 201
Circular confidence region, given by single value of horizontal uncertainty (meter) 310.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 134
Number of associated phases, regardless of their use for origin computation 17
Number of defining phases 10
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.12
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.25900
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 5
Magnitude information

ML:1.3

Field Value
Value 1.3
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 125355551
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2024-02-18 12:35:24
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CRE.HHZ. 2024-02-18T12:30:45.17 3.0 positive manual P 0.84 0
IV.CSNT.HHZ. 2024-02-18T12:30:41.87 3.0 negative manual P -0.13 0
IV.CASP.HHZ. 2024-02-18T12:30:40.42 3.0 positive manual P 0.09 0
IV.LOCA.HHZ. 2024-02-18T12:30:39.37 3.0 negative manual P -0.06 0
IV.CAFI.HHZ. 2024-02-18T12:30:39.21 3.0 positive manual P -0.19 0
IV.LATE.HHZ. 2024-02-18T12:30:39.18 0.3 undecidable manual S 152 28.749 101 0.02 72
IV.SACS.HHZ. 2024-02-18T12:30:36.76 0.6 undecidable manual S 88 22.0668 105 -0.14 48
IV.RIBO.EHZ.01 2024-02-18T12:30:36.20 3.0 undecidable manual P -1.75 0
IV.MGAB.HHZ. 2024-02-18T12:30:34.84 3.0 undecidable manual P -1.26 0
IV.LATE.HHZ. 2024-02-18T12:30:34.67 0.1 negative manual P 152 28.749 101 -0.19 93
IV.ARCI.HHZ. 2024-02-18T12:30:33.92 0.3 undecidable manual S 275 13.2756 113 -0.09 73
IV.SACS.HHZ. 2024-02-18T12:30:33.64 0.1 undecidable manual P 88 22.0668 105 0.09 96
IV.MCIV.CHZ. 2024-02-18T12:30:32.32 0.3 undecidable manual S 156 7.7811 127 -0.01 75
IV.MCIV.CHZ. 2024-02-18T12:30:31.09 0.1 positive manual P 156 7.7811 127 0.17 97
IV.ARCI.HHZ. 2024-02-18T12:30:31.94 0.1 undecidable manual P 275 13.2756 113 0.05 99
TV.SF11.HHZ. 2024-02-18T12:30:31.43 0.3 undecidable manual S 49 4.3956 143 -0.06 75
TV.SF11.HHZ. 2024-02-18T12:30:30.49 0.1 undecidable manual P 49 4.3956 143 0.05 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ARCI.HHN. ML:1.4 0.0003505 1.8 AML other m 2024-02-18T12:30:35.06
IV.ARCI.HHE. ML:1.4 0.0003175 1.34 AML other m 2024-02-18T12:30:36.73
IV.SACS.HHN. ML:1.2 0.0001032 0.56 AML other m 2024-02-18T12:30:38.66
IV.SACS.HHE. ML:1.0 0.00007845 0.5 AML other m 2024-02-18T12:30:38.95
IV.LATE.HHE. ML:1.5 0.00016999999999999999 0.66 AML other m 2024-02-18T12:30:39.28
IV.LATE.HHN. ML:1.8 0.0003075 0.56 AML other m 2024-02-18T12:30:41.02
IV.CASP.HHN. ML:0.7 0.00001084 1.28 AML other m 2024-02-18T12:30:44.23
IV.LOCA.HHN. ML:1.2 0.00003685 0.18 AML other m 2024-02-18T12:30:46.28
IV.LOCA.HHE. ML:1.3 0.000039750000000000004 0.16 AML other m 2024-02-18T12:30:46.29
IV.CASP.HHE. ML:0.7 0.00000894 0.4 AML other m 2024-02-18T12:30:51.30
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