Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 08-02-2023 and time 23:11:31 (UTC) in region 1 km S Siena (SI)

A magnitude ML 1.6 earthquake occured in region: 1 km S Siena (SI), on

  • 08-02-2023 23:11:31 (UTC)
  • 09-02-2023 00:11:31 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.3100, 11.3300 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
Monteroni d'Arbia SI 12 9088 73107
Monteriggioni SI 13 9810 82917
Castelnuovo Berardenga SI 15 9097 92014
Murlo SI 16 2389 94403
Castellina in Chianti SI 18 2859 97262
Gaiole in Chianti SI 20 2758 100020

Municipalities with at least 50000 inhabitants

An earthquake occurred to
1 Km S of Siena (53903 inhabitants)
48 Km W of Arezzo (99543 inhabitants)
51 Km S of Scandicci (50609 inhabitants)
52 Km S of Firenze (382808 inhabitants)
63 Km N of Grosseto (82087 inhabitants)
66 Km S of Prato (191150 inhabitants)
77 Km SE of Pistoia (90315 inhabitants)
87 Km E of Livorno (159219 inhabitants)
87 Km SE of Pisa (89158 inhabitants)
89 Km W of Perugia (166134 inhabitants)
89 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 1.6 2023-02-08
23:11:31		 43.3098 11.3295 9 2024-03-01
17:18:15		 Bollettino Sismico Italiano INGV 120582341
Reviewed
Rev100 		ML 1.6 2023-02-08
23:11:31		 43.3227 11.3083 12 2023-02-08
23:36:53		 Sala Sismica INGV-Roma 114274781
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-02-08 23:11:31 ± 0.12
Latitude 43.3098 ± 0.0045
Longitude 11.3295 ± 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 120582341

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 971
Semi-minor axis of confidence ellipse (meter) 487
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 282
Circular confidence region, given by single value of horizontal uncertainty (meter) 970.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 106
Number of associated phases, regardless of their use for origin computation 36
Number of defining phases 32
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) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.74104
Number of stations at which the event was observed 22
Number of stations from which data was used for origin computation 18
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 10
Type of magnitude ML
Reference to an origin 114274781
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-02-08 23:36:53

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 10
Type of magnitude ML
Reference to an origin 120582341
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2023-08-29 10:10:36
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.PAOL.HHZ. 2023-02-08T23:13:10.76 3.0 undecidable manual Sg 12.17 0
OX.MARN.HHZ. 2023-02-08T23:12:32.41 3.0 undecidable manual Sn -1.78 0
MN.TRI.HHZ. 2023-02-08T23:12:14.35 3.0 undecidable manual Pn -0.44 0
IV.MSSA.HHZ. 2023-02-08T23:11:58.53 3.0 negative manual Pn 1.89 0
IV.BOSL.HHE. 2023-02-08T23:11:52.27 0.3 undecidable manual S 3 68.9754 50 -0.08 71
IV.CRE.HHE. 2023-02-08T23:11:50.41 0.6 undecidable manual S 55 60.6948 50 0.26 46
IV.MCIV.CHE. 2023-02-08T23:11:50.26 0.6 undecidable manual S 154 65.2902 50 -1.11 33
IV.RUFI.EHZ. 2023-02-08T23:11:49.62 0.6 undecidable manual S 14 60.2952 50 -0.43 45
TV.SF11.HHZ. 2023-02-08T23:11:48.07 0.3 undecidable manual S 150 56.499 50 -0.96 55
IV.ARCI.HHZ. 2023-02-08T23:11:48.30 0.6 undecidable manual S 167 52.2033 50 0.43 45
IV.CAFI.HHZ. 2023-02-08T23:11:47.20 0.3 undecidable manual S 87 51.4152 50 -0.47 67
IV.PARC.HHE. 2023-02-08T23:11:46.12 0.3 undecidable manual P 63 82.251 50 0.73 58
IV.SFI.HNN. 2023-02-08T23:11:45.47 0.3 undecidable manual P 32 77.9664 50 0.74 58
IV.TRIF.CHZ. 2023-02-08T23:11:44.52 0.6 undecidable manual S 238 40.7259 50 -0.29 48
IV.VMGN.HHN. 2023-02-08T23:11:44.55 0.3 undecidable manual P 13 73.371 50 0.53 63
IV.MGAB.HHZ. 2023-02-08T23:11:44.86 0.3 undecidable manual P 125 77.1672 50 0.25 67
IV.MCIV.CHE. 2023-02-08T23:11:43.07 0.1 undecidable manual P 154 65.2902 50 0.29 91
IV.BOSL.HHE. 2023-02-08T23:11:43.28 0.3 undecidable manual P 3 68.9754 50 -0.06 71
IV.MALA1.EHN. 2023-02-08T23:11:42.96 0.6 undecidable manual S 161 35.9418 50 -0.58 44
IV.RUFI.EHZ. 2023-02-08T23:11:42.13 0.3 undecidable manual P 14 60.2952 50 0.12 71
IV.CRE.HHE. 2023-02-08T23:11:42.98 0.3 undecidable manual P 55 60.6948 50 0.91 56
IV.MALA0.EHN. 2023-02-08T23:11:42.84 0.6 undecidable manual S 161 35.742 50 -0.62 44
IV.MALA4.EHZ. 2023-02-08T23:11:42.84 0.6 undecidable manual S 160 35.8419 50 -0.66 43
TV.SF11.HHZ. 2023-02-08T23:11:41.67 0.1 undecidable manual P 150 56.499 50 0.24 93
IV.ARCI.HHZ. 2023-02-08T23:11:41.34 0.3 undecidable manual P 167 52.2033 50 0.59 64
IV.CAFI.HHZ. 2023-02-08T23:11:40.76 0.3 undecidable manual P 87 51.4152 50 0.12 73
IV.OSSC.HHZ. 2023-02-08T23:11:39.63 0.3 undecidable manual S 344 24.6531 110 -0.52 70
IV.TRIF.CHZ. 2023-02-08T23:11:39.29 0.3 undecidable manual P 238 40.7259 50 0.3 71
IV.MALA0.EHN. 2023-02-08T23:11:38.22 0.3 undecidable manual P 161 35.742 50 0 76
IV.MALA4.EHZ. 2023-02-08T23:11:38.07 0.3 undecidable manual P 160 35.8419 50 -0.16 74
IV.MALA1.EHN. 2023-02-08T23:11:38.21 0.3 undecidable manual P 161 35.9418 50 -0.05 76
IV.FROS.CHZ. 2023-02-08T23:11:38.13 0.3 undecidable manual S 232 17.871 117 0.14 77
IV.CSNT.HHZ. 2023-02-08T23:11:37.52 0.3 undecidable manual S 350 18.3705 116 -0.63 67
IV.OSSC.HHZ. 2023-02-08T23:11:36.00 0.3 undecidable manual P 344 24.6531 110 -0.3 73
IV.FROS.CHZ. 2023-02-08T23:11:35.44 0.1 undecidable manual P 232 17.871 117 0.38 97
IV.CSNT.HHZ. 2023-02-08T23:11:34.91 0.1 undecidable manual P 350 18.3705 116 -0.24 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FROS.CHE. ML:1.8 0.0005105000000000001 0.16 AML other m 2023-02-08T23:11:38.28
IV.FROS.CHN. ML:1.6 0.0003636498 0.3328 AML other m 2023-02-08T23:11:39.40
IV.OSSC.HHN. ML:1.7 0.00028305619999999997 0.1792 AML other m 2023-02-08T23:11:39.88
IV.OSSC.HHE. ML:1.8 0.00042300000000000004 1.82 AML other m 2023-02-08T23:11:39.92
IV.CAFI.HHE. ML:1.3 0.00004973495 0.2432 AML other m 2023-02-08T23:11:47.90
IV.CAFI.HHN. ML:1.4 0.00006334276550000001 0.2432 AML other m 2023-02-08T23:11:48.40
IV.ARCI.HHN. ML:1.6 0.00010220000000000002 0.68 AML other m 2023-02-08T23:11:49.57
IV.ARCI.HNN. ML:1.4 0.000072255625 0.192 AML other m 2023-02-08T23:11:49.57
IV.ARCI.HNE. ML:1.6 0.000090956705 0.5376 AML other m 2023-02-08T23:11:49.86
IV.ARCI.HHE. ML:1.6 0.00009279999999999999 1.06 AML other m 2023-02-08T23:11:50.59
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