Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.0 on date 05-10-2023 and time 02:28:50 (UTC) in region 2 km E Montieri (GR)

A magnitude ML 2.0 earthquake occured in region: 2 km E Montieri (GR), on

  • 05-10-2023 02:28:50 (UTC)
  • 05-10-2023 04:28:50 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.1280, 11.0380 at 9 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
Montieri GR 2 1204 1204
Chiusdino SI 5 1903 3107
Monticiano SI 12 1571 4678
Castelnuovo di Val di Cecina PI 14 2231 6909
Massa Marittima GR 15 8375 15284
Monterotondo Marittimo GR 15 1371 16655
Radicondoli SI 15 914 17569
Roccastrada GR 17 9199 26768

Municipalities with at least 50000 inhabitants

An earthquake occurred to
32 Km SW of Siena (53903 inhabitants)
41 Km N of Grosseto (82087 inhabitants)
71 Km S of Scandicci (50609 inhabitants)
74 Km S of Firenze (382808 inhabitants)
76 Km SE of Livorno (159219 inhabitants)
78 Km W of Arezzo (99543 inhabitants)
83 Km SE of Pisa (89158 inhabitants)
84 Km S of Prato (191150 inhabitants)
90 Km S of Pistoia (90315 inhabitants)
91 Km SE of Lucca (89046 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 2.0 2023-10-05
02:28:50		 43.1283 11.0375 9 2023-10-05
02:42:21		 Sala Sismica INGV-Roma 121774661
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-10-05 02:28:50 ± 0.12
Latitude 43.1283 ± 0.0063
Longitude 11.0375 ± 0.0111
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 121774661

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 982
Semi-minor axis of confidence ellipse (meter) 263
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 295
Circular confidence region, given by single value of horizontal uncertainty (meter) 980.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 66
Number of associated phases, regardless of their use for origin computation 30
Number of defining phases 21
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.44
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.98746
Number of stations at which the event was observed 22
Number of stations from which data was used for origin computation 13
Magnitude information

ML:2.0

Field Value
Value 2.0
Uncertainty 0.6
Num. used stations 16
Type of magnitude ML
Reference to an origin 121774661
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-10-05 02:42:21
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
7C.SPAOL.HNZ. 2023-10-05T02:30:28.27 3.0 positive manual Pn 5.25 0
IV.TDS.HHZ. 2023-10-05T02:30:20.70 3.0 undecidable manual Pg 12.52 0
CH.DIX.HHZ. 2023-10-05T02:30:02.05 3.0 positive manual Pg 12.76 0
IV.MRGE.HHZ. 2023-10-05T02:30:00.02 3.0 undecidable manual Pg 11.34 0
IV.GIUL.HHZ. 2023-10-05T02:29:55.23 3.0 undecidable manual Sn -0.41 0
GU.TRAV.HHZ. 2023-10-05T02:29:54.33 3.0 undecidable manual Pg 12.9 0
IX.CMP3.EHZ.02 2023-10-05T02:29:52.77 3.0 positive manual Pn 3.54 0
IV.SGG.HNZ. 2023-10-05T02:29:39.03 3.0 undecidable manual Pn 1.77 0
IV.BDI.HHZ. 2023-10-05T02:29:09.25 0.1 undecidable manual P 341 109.6125 50 0.57 74
GU.POPM.HHZ. 2023-10-05T02:29:08.50 0.1 undecidable manual P 348 104.118 50 0.66 73
IV.CRE.HHZ. 2023-10-05T02:29:07.03 3.0 positive manual P 0.46 0
IV.RUFI.EHZ. 2023-10-05T02:29:06.08 0.3 undecidable manual P 26 87.4458 50 0.82 53
IV.OSSC.HHZ. 2023-10-05T02:29:05.00 0.3 undecidable manual S 21 46.9197 50 -0.6 62
IV.ARCI.HHZ. 2023-10-05T02:29:05.10 0.3 undecidable manual S 131 46.9197 50 -0.5 65
IV.CAFI.HHZ. 2023-10-05T02:29:04.47 0.3 undecidable manual P 73 78.2661 50 0.61 58
IV.CSNT.HHZ. 2023-10-05T02:29:03.70 0.3 undecidable manual S 28 43.3233 50 -0.94 54
IV.PII.HHZ. 2023-10-05T02:29:03.79 0.3 undecidable manual P 328 77.7666 50 0.02 68
IV.CASP.HHZ. 2023-10-05T02:29:02.90 0.3 undecidable manual S 201 40.0266 50 -0.84 57
IV.ARCI.HHZ. 2023-10-05T02:28:59.40 0.1 undecidable manual P 131 46.9197 50 0.37 89
IV.LOCA.HHZ. 2023-10-05T02:28:59.20 0.3 undecidable manual S 43 26.8509 108 -0.62 64
IV.OSSC.HHZ. 2023-10-05T02:28:59.01 0.1 positive manual P 21 46.9197 50 -0.02 95
IV.CASP.HHZ. 2023-10-05T02:28:58.01 0.3 undecidable manual P 201 40.0266 50 0.06 72
IV.CSNT.HHZ. 2023-10-05T02:28:58.41 0.1 undecidable manual P 28 43.3233 50 -0.06 95
IV.RIBO.EHZ.01 2023-10-05T02:28:57.50 0.3 undecidable manual S 178 19.9689 113 -0.07 74
IV.LOCA.HHZ. 2023-10-05T02:28:55.74 0.1 undecidable manual P 43 26.8509 108 0.05 98
IV.FROS.CHZ. 2023-10-05T02:28:55.30 0.1 undecidable manual S 47 13.1757 123 -0.2 98
IV.RIBO.EHZ.01 2023-10-05T02:28:54.79 0.1 undecidable manual P 178 19.9689 113 0.4 92
IV.TRIF.CHZ. 2023-10-05T02:28:54.30 0.1 undecidable manual S 262 10.9779 128 -0.59 89
IV.FROS.CHZ. 2023-10-05T02:28:53.54 0.1 positive manual P 47 13.1757 123 0.34 95
IV.TRIF.CHZ. 2023-10-05T02:28:52.94 0.1 negative manual P 262 10.9779 128 0.1 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.TRIF.CHE. ML:2.4 0.0036100000000000004 0.36 AML other m 2023-10-05T02:28:54.72
IV.TRIF.CHN. ML:2.3 0.0025700000000000002 0.48 AML other m 2023-10-05T02:28:54.51
IV.FROS.CHE. ML:2.1 0.0013450000000000003 0.62 AML other m 2023-10-05T02:28:55.52
IV.FROS.CHN. ML:2.1 0.001415 0.12 AML other m 2023-10-05T02:28:55.76
IV.RIBO.EHN.01 ML:2.4 0.001845 1.34 AML other m 2023-10-05T02:28:57.98
IV.RIBO.EHE.01 ML:2.2 0.00135 1.52 AML other m 2023-10-05T02:28:58.92
IV.CASP.HHE. ML:1.9 0.0002855 0.3 AML other m 2023-10-05T02:29:03.36
IV.CASP.HHN. ML:2.1 0.0004505 0.1 AML other m 2023-10-05T02:29:03.49
IV.CSNT.HHN. ML:1.5 0.00010089999999999999 0.16 AML other m 2023-10-05T02:29:04.20
IV.CSNT.HHE. ML:1.5 0.00010999999999999999 0.24 AML other m 2023-10-05T02:29:04.41
IV.ARCI.HHE. ML:1.6 0.00010059999999999999 1.64 AML other m 2023-10-05T02:29:05.02
IV.ARCI.HHN. ML:1.6 0.0001021 0.36 AML other m 2023-10-05T02:29:06.23
IV.PII.HHN. ML:1.4 0.0000378 0.4 AML other m 2023-10-05T02:29:13.74
IV.PII.HHE. ML:1.3 0.0000312 0.3 AML other m 2023-10-05T02:29:15.27
IV.SGG.HNN. ML:6.3 0.1982 0.44 AML other m 2023-10-05T02:29:59.58
IV.SGG.HNE. ML:6.3 0.19444999999999998 0.44 AML other m 2023-10-05T02:29:59.58
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
Waveforms Seismic signals in miniseed + resp format Download