Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 08-02-2023 and time 23:11:38 (Italy) in region 1 km W Siena (SI)

A magnitude ML 1.4 earthquake occured in region: 1 km W Siena (SI), on

  • 08-02-2023 22:11:38 (UTC)
  • 08-02-2023 23:11:38 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.3220, 11.3220 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 9 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)
48 Km W of Arezzo (99543 inhabitants)
50 Km S of Scandicci (50609 inhabitants)
50 Km S of Firenze (382808 inhabitants)
65 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 1.4 2023-02-08
22:11:38		 43.3215 11.322 9 2024-03-01
17:18:16		 Bollettino Sismico Italiano INGV 120613981
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-02-08 22:11:38 ± 0.13
Latitude 43.3215 ± 0.0072
Longitude 11.3220 ± 0.0161
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 120613981

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1279
Semi-minor axis of confidence ellipse (meter) 663
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 290
Circular confidence region, given by single value of horizontal uncertainty (meter) 1280.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 109
Number of associated phases, regardless of their use for origin computation 17
Number of defining phases 17
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) 0.15288
Epicentral distance of station farthest from the epicenter (degree) 0.54499
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 10
Magnitude information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.2
Num. used stations 6
Type of magnitude ML
Reference to an origin 120613981
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2023-08-30 15:37:03
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.RUFI.EHE. 2023-02-08T22:11:56.72 0.6 undecidable manual S 15 59.2962 50 -0.2 45
TV.SF11.HHZ. 2023-02-08T22:11:55.53 0.6 undecidable manual S 150 57.9975 50 -1.04 34
IV.TRIF.CHZ. 2023-02-08T22:11:51.68 0.6 undecidable manual S 236 40.9257 50 -0.35 45
IV.MALA4.EHZ. 2023-02-08T22:11:50.13 0.6 undecidable manual S 160 37.2294 50 -0.91 37
IV.CRE.HHE. 2023-02-08T22:11:50.09 0.3 undecidable manual P 57 60.495 50 0.89 54
IV.RUFI.EHE. 2023-02-08T22:11:49.63 0.3 undecidable manual P 15 59.2962 50 0.62 60
IV.ARCI.HHZ. 2023-02-08T22:11:48.45 0.3 undecidable manual P 167 53.502 50 0.32 66
TV.SF11.HHZ. 2023-02-08T22:11:48.92 0.1 undecidable manual P 150 57.9975 50 0.11 92
IV.CAFI.HNN. 2023-02-08T22:11:47.82 0.3 undecidable manual P 89 52.0035 50 -0.07 70
IV.TRIF.CHZ. 2023-02-08T22:11:46.48 0.3 undecidable manual P 236 40.9257 50 0.29 68
IV.OSSC.HHZ. 2023-02-08T22:11:46.38 0.6 undecidable manual S 345 23.2545 111 -0.48 45
IV.FROS.CHZ. 2023-02-08T22:11:45.36 0.6 undecidable manual S 227 18.2706 116 0.08 50
IV.MALA4.EHZ. 2023-02-08T22:11:45.55 0.3 undecidable manual P 160 37.2294 50 -0.07 72
IV.CSNT.HHZ. 2023-02-08T22:11:44.46 0.6 undecidable manual S 351 16.9719 118 -0.44 46
IV.OSSC.HHZ. 2023-02-08T22:11:43.04 0.1 undecidable manual P 345 23.2545 111 -0.16 97
IV.CSNT.HHZ. 2023-02-08T22:11:42.02 0.1 undecidable manual P 351 16.9719 118 -0.04 100
IV.FROS.CHZ. 2023-02-08T22:11:42.57 0.1 undecidable manual P 227 18.2706 116 0.28 95
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CSNT.HHN. ML:1.4 0.0002205 0.12 AML other m 2023-02-08T22:11:44.65
IV.CSNT.HHE. ML:1.3 0.000166 0.3 AML other m 2023-02-08T22:11:44.95
IV.FROS.CHE. ML:1.7 0.000373 0.16 AML other m 2023-02-08T22:11:45.50
IV.FROS.CHN. ML:1.6 0.0003375 0.58 AML other m 2023-02-08T22:11:46.96
IV.OSSC.HHN. ML:1.2 0.0001104 1.26 AML other m 2023-02-08T22:11:46.17
IV.OSSC.HHE. ML:1.5 0.0001915 0.18 AML other m 2023-02-08T22:11:46.87
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