Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.5 on date 09-02-2023 and time 08:23:54 (UTC) in region 3 km E Siena (SI)

A magnitude ML 1.5 earthquake occured in region: 3 km E Siena (SI), on

  • 09-02-2023 08:23:54 (UTC)
  • 09-02-2023 09:23:54 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.3180, 11.3740 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 3 53903 53903
Monteroni d'Arbia SI 10 9088 62991
Castelnuovo Berardenga SI 11 9097 72088
Sovicille SI 12 10116 82204
Monteriggioni SI 15 9810 92014
Murlo SI 17 2389 94403
Asciano SI 18 7118 101521
Gaiole in Chianti SI 18 2758 104279
Castellina in Chianti SI 19 2859 107138
Radda in Chianti SI 19 1613 108751
Rapolano Terme SI 19 5249 114000

Municipalities with at least 50000 inhabitants

An earthquake occurred to
3 Km E of Siena (53903 inhabitants)
44 Km W of Arezzo (99543 inhabitants)
51 Km S of Firenze (382808 inhabitants)
52 Km SE of Scandicci (50609 inhabitants)
65 Km NE of Grosseto (82087 inhabitants)
67 Km SE of Prato (191150 inhabitants)
78 Km SE of Pistoia (90315 inhabitants)
86 Km W of Perugia (166134 inhabitants)
90 Km E of Livorno (159219 inhabitants)
90 Km E of Pisa (89158 inhabitants)
92 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
Bulletin
Rev1000 		ML 1.5 2023-02-09
08:23:54		 43.3175 11.374 9 2024-03-01
17:17:58		 Bollettino Sismico Italiano INGV 115212651
Reviewed
Rev100 		ML 1.5 2023-02-09
08:23:54		 43.3245 11.3702 9 2023-02-09
08:35:57		 Sala Sismica INGV-Roma 114286961
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-02-09 08:23:54 ± 0.12
Latitude 43.3175 ± 0.0063
Longitude 11.3740 ± 0.0124
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 115212651

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1003
Semi-minor axis of confidence ellipse (meter) 679
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 304
Circular confidence region, given by single value of horizontal uncertainty (meter) 1000.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 96
Number of associated phases, regardless of their use for origin computation 22
Number of defining phases 22
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.34
Epicentral distance of station closest to the epicenter (degree) 0.16727
Epicentral distance of station farthest from the epicenter (degree) 0.52970
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 12
Magnitudes information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.2
Num. used stations 15
Type of magnitude ML
Reference to an origin 115212651
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2023-09-19 09:42:22

ML:1.5

Field Value
Value 1.5
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 114286961
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-02-09 08:35:57
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
TV.SF11.HHZ. 2023-02-09T08:24:11.50 0.3 undecidable manual S 154 55.5999 50 -0.67 61
IV.ARCI.HHZ. 2023-02-09T08:24:11.77 0.3 undecidable manual S 171 52.3032 50 0.48 66
IV.TRIF.CHZ. 2023-02-09T08:24:09.00 0.3 undecidable manual S 240 44.2224 50 -0.14 72
IV.CAFI.HHZ. 2023-02-09T08:24:09.59 0.6 undecidable manual S 88 47.8188 50 -0.51 44
IV.MALA0.EHN. 2023-02-09T08:24:06.48 0.3 undecidable manual S 167 35.5422 50 -0.33 70
IV.MALA1.EHN. 2023-02-09T08:24:06.41 0.6 undecidable manual S 167 35.742 50 -0.47 45
IV.CRE.HHE. 2023-02-09T08:24:06.04 0.3 undecidable manual P 54 57.2982 50 1.12 50
IV.MALA4.EHZ. 2023-02-09T08:24:06.43 0.3 undecidable manual S 166 35.6421 50 -0.41 69
IV.RUFI.EHZ. 2023-02-09T08:24:05.83 0.6 undecidable manual P 11 58.7967 50 0.68 40
TV.SF11.HHZ. 2023-02-09T08:24:05.06 0.6 undecidable manual P 154 55.5999 50 0.4 44
IV.ARCI.HHZ. 2023-02-09T08:24:04.43 0.3 undecidable manual P 171 52.3032 50 0.27 69
IV.CAFI.HHZ. 2023-02-09T08:24:03.68 0.3 undecidable manual P 88 47.8188 50 0.21 70
IV.TRIF.CHZ. 2023-02-09T08:24:03.13 0.3 undecidable manual P 240 44.2224 50 0.21 71
IV.OSSC.HHZ. 2023-02-09T08:24:03.30 0.3 undecidable manual S 336 25.0527 110 -0.35 71
IV.FROS.CHZ. 2023-02-09T08:24:02.50 0.3 undecidable manual S 236 21.2676 113 0.08 76
IV.CSNT.HHZ. 2023-02-09T08:24:01.20 0.3 undecidable manual S 339 18.5703 116 -0.36 72
IV.MALA4.EHZ. 2023-02-09T08:24:01.56 0.3 undecidable manual P 166 35.6421 50 -0.02 75
IV.MALA1.EHN. 2023-02-09T08:24:01.73 0.3 undecidable manual P 167 35.742 50 0.12 73
IV.MALA0.EHN. 2023-02-09T08:24:01.53 0.3 undecidable manual P 167 35.5422 50 -0.04 75
IV.FROS.CHZ. 2023-02-09T08:23:59.36 0.1 undecidable manual P 236 21.2676 113 0.32 96
IV.OSSC.HHZ. 2023-02-09T08:23:59.61 0.3 undecidable manual P 336 25.0527 110 -0.14 74
IV.CSNT.HHZ. 2023-02-09T08:23:58.38 0.1 undecidable manual P 339 18.5703 116 -0.16 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CSNT.HHE. ML:1.8 0.000507 0.18 AML other m 2023-02-09T08:24:01.46
IV.CSNT.HHN. ML:1.6 0.00031599999999999993 0.86 AML other m 2023-02-09T08:24:01.70
IV.OSSC.HHE. ML:1.4 0.0001337496 0.3008 AML other m 2023-02-09T08:24:03.74
IV.OSSC.HHN. ML:1.4 0.0001349229 0.3392 AML other m 2023-02-09T08:24:05.24
IV.CAFI.HHE. ML:1.2 0.000042621524999999993 0.2816 AML other m 2023-02-09T08:24:09.99
IV.TRIF.CHE. ML:1.6 0.0001206 0.28 AML other m 2023-02-09T08:24:10.53
IV.CAFI.HNN. ML:1.3 0.000058097915 0.3712 AML other m 2023-02-09T08:24:10.98
IV.CAFI.HHN. ML:1.3 0.00005490678 0.384 AML other m 2023-02-09T08:24:10.98
IV.TRIF.CHN. ML:1.5 0.00009749999999999998 0.72 AML other m 2023-02-09T08:24:12.63
IV.ARCI.HNE. ML:1.7 0.000116164145 0.2816 AML other m 2023-02-09T08:24:12.90
IV.ARCI.HHE. ML:1.6 0.000107007705 0.256 AML other m 2023-02-09T08:24:13.03
IV.ARCI.HHN. ML:1.9 0.0001819519 0.3968 AML other m 2023-02-09T08:24:13.17
IV.ARCI.HNN. ML:1.8 0.00016527880000000001 0.3904 AML other m 2023-02-09T08:24:12.98
IV.CAFI.HNE. ML:1.3 0.000047523615 0.352 AML other m 2023-02-09T08:24:13.27
IV.RUFI.EHE. ML:1.3 0.000040468445 0.6784 AML other m 2023-02-09T08:24:13.65
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