Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.2 on date 12-02-2023 and time 06:50:40 (Italy) in region 1 km W Siena (SI)

A magnitude ML 1.2 earthquake occured in region: 1 km W Siena (SI), on

  • 12-02-2023 05:50:40 (UTC)
  • 12-02-2023 06:50:40 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.3190, 11.3180 at 9 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
Siena SI 1 53903 53903
Sovicille SI 8 10116 64019
Monteriggioni SI 12 9810 73829
Monteroni d'Arbia SI 13 9088 82917
Castelnuovo Berardenga SI 15 9097 92014
Castellina in Chianti SI 17 2859 94873
Murlo SI 18 2389 97262
Gaiole in Chianti SI 19 2758 100020
Radda in Chianti SI 19 1613 101633
Colle di Val d'Elsa SI 20 21620 123253

Municipalities with at least 50000 inhabitants

An earthquake occurred to
1 Km W of Siena (53903 inhabitants)
49 Km W of Arezzo (99543 inhabitants)
50 Km S of Scandicci (50609 inhabitants)
50 Km S of Firenze (382808 inhabitants)
64 Km N of Grosseto (82087 inhabitants)
65 Km S of Prato (191150 inhabitants)
76 Km SE of Pistoia (90315 inhabitants)
86 Km E of Livorno (159219 inhabitants)
86 Km SE of Pisa (89158 inhabitants)
88 Km SE of Lucca (89046 inhabitants)
90 Km W of Perugia (166134 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 1.2 2023-02-12
05:50:40		 43.3192 11.318 9 2024-03-01
17:18:16		 Bollettino Sismico Italiano INGV 120723421
Reviewed
Rev100 		ML 1.2 2023-02-12
05:50:41		 43.3207 11.3383 6 2023-02-12
05:58:18		 Sala Sismica INGV-Roma 114369781
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-02-12 05:50:40 ± 0.12
Latitude 43.3192 ± 0.0054
Longitude 11.3180 ± 0.0111
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 120723421

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 849
Semi-minor axis of confidence ellipse (meter) 532
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 291
Circular confidence region, given by single value of horizontal uncertainty (meter) 850.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 97
Number of associated phases, regardless of their use for origin computation 28
Number of defining phases 28
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.38
Epicentral distance of station closest to the epicenter (degree) 0.15558
Epicentral distance of station farthest from the epicenter (degree) 0.74464
Number of stations at which the event was observed 15
Number of stations from which data was used for origin computation 15
Magnitudes information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 120723421
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2023-09-04 00:16:40

ML:1.2

Field Value
Value 1.2
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 114369781
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-02-12 05:58:18
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CASP.HHZ. 2023-02-12T05:51:02.47 0.6 undecidable manual S 212 69.1752 50 0.05 48
IV.CRE.HHZ. 2023-02-12T05:51:00.98 0.6 undecidable manual S 57 60.8946 50 0.76 40
IV.CRMI.HNN. 2023-02-12T05:50:59.46 0.6 undecidable manual S 333 59.3961 50 -0.37 46
IV.RUFI.EHZ. 2023-02-12T05:50:59.39 0.6 undecidable manual S 15 59.5959 50 -0.47 45
TV.SF11.HHZ. 2023-02-12T05:50:58.17 0.6 undecidable manual S 150 57.8976 50 -1.25 32
IV.ARCI.HHZ. 2023-02-12T05:50:58.13 0.6 undecidable manual S 166 53.4021 50 -0.08 49
IV.CAFI.HHZ. 2023-02-12T05:50:57.10 0.6 undecidable manual S 89 52.3032 50 -0.83 39
IV.PARC.HHZ. 2023-02-12T05:50:55.92 0.3 undecidable manual P 63 82.6506 50 0.48 64
IV.ATMC.EHE. 2023-02-12T05:50:54.25 0.3 undecidable manual P 78 71.9724 50 0.46 66
IV.CASP.HHZ. 2023-02-12T05:50:54.27 0.3 undecidable manual P 212 69.1752 50 0.9 55
IV.TRIF.CHZ. 2023-02-12T05:50:54.31 0.6 undecidable manual S 236 40.5261 50 -0.47 46
IV.MALA0.EHN. 2023-02-12T05:50:53.06 0.6 undecidable manual S 160 36.9297 50 -0.77 42
IV.MALA2.EHN. 2023-02-12T05:50:53.19 0.6 undecidable manual S 160 37.3293 50 -0.74 42
IV.RUFI.EHZ. 2023-02-12T05:50:52.31 0.3 undecidable manual P 15 59.5959 50 0.42 68
IV.CRE.HHZ. 2023-02-12T05:50:52.96 0.1 undecidable manual P 57 60.8946 50 0.87 76
IV.CRMI.HNN. 2023-02-12T05:50:52.14 0.3 undecidable manual P 333 59.3961 50 0.27 70
IV.ARCI.HHZ. 2023-02-12T05:50:51.28 0.3 undecidable manual P 166 53.4021 50 0.35 70
TV.SF11.HHZ. 2023-02-12T05:50:51.60 0.3 undecidable manual P 150 57.8976 50 -0.03 74
IV.CAFI.HHZ. 2023-02-12T05:50:50.71 0.1 undecidable manual P 89 52.3032 50 -0.06 99
IV.TRIF.CHZ. 2023-02-12T05:50:49.14 0.3 undecidable manual P 236 40.5261 50 0.19 74
IV.OSSC.HHZ. 2023-02-12T05:50:49.30 0.3 undecidable manual S 346 23.4543 111 -0.37 73
IV.FROS.CHZ. 2023-02-12T05:50:48.01 0.3 undecidable manual S 227 17.871 116 0.12 78
IV.MALA0.EHN. 2023-02-12T05:50:48.21 0.3 undecidable manual P 160 36.9297 50 -0.19 74
IV.MALA2.EHN. 2023-02-12T05:50:48.27 0.3 undecidable manual P 160 37.3293 50 -0.19 74
IV.CSNT.HHZ. 2023-02-12T05:50:47.22 0.3 undecidable manual S 353 17.2716 117 -0.48 72
IV.FROS.CHZ. 2023-02-12T05:50:45.28 0.1 undecidable manual P 227 17.871 116 0.31 100
IV.OSSC.HHZ. 2023-02-12T05:50:45.74 0.1 undecidable manual P 346 23.4543 111 -0.26 100
IV.CSNT.HHZ. 2023-02-12T05:50:44.68 0.3 undecidable manual P 353 17.2716 117 -0.19 77
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FROS.CHE. ML:1.8 0.000632 0.2 AML other m 2023-02-12T05:50:48.22
IV.CSNT.HHN. ML:1.2 0.00014600000000000003 0.12 AML other m 2023-02-12T05:50:48.52
IV.FROS.CHN. ML:1.8 0.000641 0.18 AML other m 2023-02-12T05:50:48.64
IV.OSSC.HHE. ML:1.1 0.0000817 0.46 AML other m 2023-02-12T05:50:50.44
IV.CSNT.HHE. ML:1.3 0.00016 0.18 AML other m 2023-02-12T05:50:50.35
IV.OSSC.HHN. ML:1.0 0.0000665 0.74 AML other m 2023-02-12T05:50:51.03
IV.CAFI.HHN. ML:1.0 0.000026099999999999997 0.68 AML other m 2023-02-12T05:50:58.19
IV.CAFI.HHE. ML:1.0 0.00002315 0.98 AML other m 2023-02-12T05:50:58.06
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