Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.3 on date 08-02-2023 and time 23:47:44 (Italy) in region 3 km W Siena (SI)

A magnitude ML 1.3 earthquake occured in region: 3 km W Siena (SI), on

  • 08-02-2023 22:47:44 (UTC)
  • 08-02-2023 23:47:44 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.3300, 11.3020 at 11 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 3 53903 53903
Sovicille SI 8 10116 64019
Monteriggioni SI 10 9810 73829
Monteroni d'Arbia SI 15 9088 82917
Castellina in Chianti SI 16 2859 85776
Castelnuovo Berardenga SI 17 9097 94873
Colle di Val d'Elsa SI 18 21620 116493
Radda in Chianti SI 19 1613 118106
Gaiole in Chianti SI 19 2758 120864
Murlo SI 19 2389 123253
Poggibonsi SI 20 29196 152449

Municipalities with at least 50000 inhabitants

An earthquake occurred to
3 Km W of Siena (53903 inhabitants)
49 Km S of Scandicci (50609 inhabitants)
49 Km S of Firenze (382808 inhabitants)
49 Km W of Arezzo (99543 inhabitants)
64 Km S of Prato (191150 inhabitants)
65 Km N of Grosseto (82087 inhabitants)
74 Km SE of Pistoia (90315 inhabitants)
84 Km E of Livorno (159219 inhabitants)
84 Km SE of Pisa (89158 inhabitants)
86 Km SE of Lucca (89046 inhabitants)
92 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 1.3 2023-02-08
22:47:44		 43.3303 11.3015 11 2024-03-01
17:18:16		 Bollettino Sismico Italiano INGV 120614031
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-02-08 22:47:44 ± 0.14
Latitude 43.3303 ± 0.0063
Longitude 11.3015 ± 0.0210
Depth (km) 11 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 120614031

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1610
Semi-minor axis of confidence ellipse (meter) 626
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 276
Circular confidence region, given by single value of horizontal uncertainty (meter) 1610.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 127
Number of associated phases, regardless of their use for origin computation 15
Number of defining phases 15
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.37
Epicentral distance of station closest to the epicenter (degree) 0.14299
Epicentral distance of station farthest from the epicenter (degree) 0.55308
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitude information

ML:1.3

Field Value
Value 1.3
Uncertainty 0.2
Num. used stations 6
Type of magnitude ML
Reference to an origin 120614031
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2023-08-30 15:39:23
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ARCI.HHZ. 2023-02-08T22:48:02.07 0.6 undecidable manual S 165 54.9006 50 -0.12 47
IV.CAFI.HHZ. 2023-02-08T22:48:01.06 0.6 undecidable manual S 90 53.6019 50 -0.79 38
IV.MALA4.EHZ. 2023-02-08T22:47:57.36 0.6 undecidable manual S 158 38.7279 50 -0.51 44
IV.CRE.HHE. 2023-02-08T22:47:57.03 0.3 undecidable manual P 58 61.3941 50 1.12 49
IV.MALA1.EHN. 2023-02-08T22:47:57.38 0.6 undecidable manual S 159 38.9277 50 -0.53 44
IV.CAFI.HHZ. 2023-02-08T22:47:55.04 0.3 undecidable manual P 90 53.6019 50 0.31 67
IV.ARCI.HHZ. 2023-02-08T22:47:55.45 0.3 undecidable manual P 165 54.9006 50 0.53 64
IV.OSSC.HHZ. 2023-02-08T22:47:53.22 0.6 undecidable manual S 348 21.867 50 -0.17 49
IV.FROS.CHZ. 2023-02-08T22:47:52.07 0.6 undecidable manual S 221 17.7711 121 -0.12 50
IV.MALA4.EHZ. 2023-02-08T22:47:52.67 0.3 undecidable manual P 158 38.7279 50 0.24 70
IV.MALA1.EHN. 2023-02-08T22:47:52.32 0.3 undecidable manual P 159 38.9277 50 -0.13 72
IV.CSNT.HHZ. 2023-02-08T22:47:51.16 0.6 undecidable manual S 357 15.873 124 -0.48 46
IV.FROS.CHZ. 2023-02-08T22:47:49.28 0.1 undecidable manual P 221 17.7711 121 0.13 99
IV.OSSC.HHZ. 2023-02-08T22:47:49.79 0.3 undecidable manual P 348 21.867 50 -0.05 75
IV.CSNT.HHZ. 2023-02-08T22:47:48.72 0.1 undecidable manual P 357 15.873 124 -0.11 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CSNT.HHN. ML:1.2 0.000145 0.1 AML other m 2023-02-08T22:47:51.40
IV.CSNT.HHE. ML:1.2 0.0001325 0.64 AML other m 2023-02-08T22:47:51.26
IV.FROS.CHN. ML:1.6 0.0002915 0.22 AML other m 2023-02-08T22:47:52.60
IV.FROS.CHE. ML:1.4 0.00019 0.12 AML other m 2023-02-08T22:47:53.10
IV.OSSC.HHE. ML:1.4 0.000161 0.22 AML other m 2023-02-08T22:47:53.56
IV.OSSC.HHN. ML:1.2 0.0000954 0.48 AML other m 2023-02-08T22:47:54.87
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