Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.9 on date 08-02-2023 and time 22:12:11 (UTC) in region 2 km W Siena (SI)

A magnitude ML 1.9 earthquake occured in region: 2 km W Siena (SI), on

  • 08-02-2023 22:12:11 (UTC)
  • 08-02-2023 23:12:11 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.3270, 11.3140 at 8 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 2 53903 53903
Sovicille SI 9 10116 64019
Monteriggioni SI 11 9810 73829
Monteroni d'Arbia SI 14 9088 82917
Castelnuovo Berardenga SI 16 9097 92014
Castellina in Chianti SI 16 2859 94873
Radda in Chianti SI 19 1613 96486
Gaiole in Chianti SI 19 2758 99244
Murlo SI 19 2389 101633
Colle di Val d'Elsa SI 19 21620 123253

Municipalities with at least 50000 inhabitants

An earthquake occurred to
2 Km W of Siena (53903 inhabitants)
49 Km W of Arezzo (99543 inhabitants)
49 Km S of Scandicci (50609 inhabitants)
50 Km S of Firenze (382808 inhabitants)
64 Km S of Prato (191150 inhabitants)
65 Km N of Grosseto (82087 inhabitants)
75 Km SE of Pistoia (90315 inhabitants)
85 Km E of Livorno (159219 inhabitants)
85 Km SE of Pisa (89158 inhabitants)
87 Km SE of Lucca (89046 inhabitants)
91 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 1.9 2023-02-08
22:12:11		 43.3268 11.314 8 2024-03-01
17:18:15		 Bollettino Sismico Italiano INGV 120583961
Reviewed
Rev100 		ML 1.9 2023-02-08
22:12:11		 43.3318 11.2993 9 2023-02-08
22:30:40		 Sala Sismica INGV-Roma 114273601
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-02-08 22:12:11 ± 0.09
Latitude 43.3268 ± 0.0036
Longitude 11.3140 ± 0.0099
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 120583961

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 683
Semi-minor axis of confidence ellipse (meter) 401
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) 680.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 70
Number of associated phases, regardless of their use for origin computation 34
Number of defining phases 34
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.3
Epicentral distance of station closest to the epicenter (degree) 0.14749
Epicentral distance of station farthest from the epicenter (degree) 0.80220
Number of stations at which the event was observed 24
Number of stations from which data was used for origin computation 24
Magnitudes information

ML:1.9

Field Value
Value 1.9
Uncertainty 0.1
Num. used stations 32
Type of magnitude ML
Reference to an origin 114273601
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-02-08 22:30:40

ML:1.9

Field Value
Value 1.9
Uncertainty 0.2
Num. used stations 32
Type of magnitude ML
Reference to an origin 120583961
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2023-08-29 10:51:37
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.VMGN.HHN. 2023-02-08T22:12:34.19 0.6 undecidable manual S 14 71.7726 50 0.51 43
IV.BOSL.HHE. 2023-02-08T22:12:32.17 0.6 undecidable manual S 4 67.1772 50 -0.28 45
IV.ARCI.HHZ. 2023-02-08T22:12:29.20 0.6 undecidable manual S 166 54.3012 50 0.2 47
IV.RUFI.EHZ. 2023-02-08T22:12:29.50 0.6 undecidable manual S 15 58.7967 50 -0.72 40
IV.CAFI.HHZ. 2023-02-08T22:12:27.30 0.6 undecidable manual S 89 52.6029 50 -1.27 31
IV.LMD.HHZ. 2023-02-08T22:12:27.16 0.3 undecidable manual P 21 89.0442 50 0.24 66
IV.PARC.HHZ. 2023-02-08T22:12:26.29 0.3 undecidable manual P 64 82.5507 50 0.38 65
IV.PII.HHZ. 2023-02-08T22:12:25.10 0.3 undecidable manual P 305 77.1672 50 0.03 70
IV.MGAB.HHZ. 2023-02-08T22:12:25.44 0.3 undecidable manual P 125 79.2651 50 0.03 70
IV.SFI.EHZ. 2023-02-08T22:12:25.52 0.3 undecidable manual P 34 77.0673 50 0.45 64
IV.CASP.HHZ. 2023-02-08T22:12:24.35 0.3 undecidable manual P 212 69.6747 50 0.42 66
IV.VMGN.HHN. 2023-02-08T22:12:24.64 0.3 undecidable manual P 14 71.7726 50 0.38 66
IV.SSP9.EHZ. 2023-02-08T22:12:24.67 0.3 undecidable manual P 67 71.2731 50 0.49 64
IV.TRIF.CHZ. 2023-02-08T22:12:24.80 0.6 undecidable manual S 235 40.7259 50 -0.59 44
IV.SACS.HHE. 2023-02-08T22:12:24.45 0.3 undecidable manual P 137 71.6727 50 0.22 68
IV.CRE.HHZ. 2023-02-08T22:12:23.00 0.3 undecidable manual P 58 60.6948 50 0.45 66
IV.MCIV.CHE. 2023-02-08T22:12:23.85 0.3 undecidable manual P 154 67.5768 50 0.25 68
IV.BOSL.HHE. 2023-02-08T22:12:23.41 0.3 undecidable manual P 4 67.1772 50 -0.14 70
IV.MALA0.EHN. 2023-02-08T22:12:23.91 0.6 undecidable manual S 160 37.8288 50 -0.72 42
IV.CRMI.HNN. 2023-02-08T22:12:22.32 0.3 undecidable manual P 333 58.497 50 0.11 72
IV.RUFI.EHZ. 2023-02-08T22:12:22.38 0.3 undecidable manual P 15 58.7967 50 0.12 71
TV.SF11.HHZ. 2023-02-08T22:12:22.14 0.3 undecidable manual P 150 58.7967 50 -0.11 71
IV.ARCI.HHZ. 2023-02-08T22:12:21.68 0.3 undecidable manual P 166 54.3012 50 0.12 72
IV.CAFI.HHZ. 2023-02-08T22:12:21.04 0.3 undecidable manual P 89 52.6029 50 -0.26 70
IV.OSSC.HHZ. 2023-02-08T22:12:19.20 0.3 undecidable manual S 346 22.4553 110 -0.47 71
IV.TRIF.CHZ. 2023-02-08T22:12:19.62 0.3 undecidable manual P 235 40.7259 50 0.15 73
IV.MALA1.EHN. 2023-02-08T22:12:18.57 0.3 undecidable manual P 160 38.1285 50 -0.5 68
IV.MALA0.EHN. 2023-02-08T22:12:18.72 0.3 undecidable manual P 160 37.8288 50 -0.31 71
IV.MALA4.EHZ. 2023-02-08T22:12:18.74 0.3 undecidable manual P 160 38.0286 50 -0.31 71
IV.FROS.CHE. 2023-02-08T22:12:18.34 0.6 undecidable manual S 225 18.1707 114 0.06 52
IV.CSNT.HHZ. 2023-02-08T22:12:17.30 0.3 undecidable manual S 353 16.3725 116 -0.41 72
IV.OSSC.HHZ. 2023-02-08T22:12:16.00 0.3 undecidable manual P 346 22.4553 110 -0.17 75
IV.CSNT.HHZ. 2023-02-08T22:12:15.26 0.3 undecidable manual P 353 16.3725 116 0.22 75
IV.FROS.CHE. 2023-02-08T22:12:15.59 0.1 undecidable manual P 225 18.1707 114 0.22 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CSNT.HHN. ML:2.0 0.0009624999999999999 1.82 AML other m 2023-02-08T22:12:17.98
IV.OSSC.HHE. ML:2.1 0.0008437256 0.1664 AML other m 2023-02-08T22:12:19.77
IV.CSNT.HHE. ML:1.9 0.0007290678000000001 0.2048 AML other m 2023-02-08T22:12:20.64
IV.OSSC.HHN. ML:2.0 0.0006045 0.3 AML other m 2023-02-08T22:12:20.59
IV.TRIF.CHE. ML:2.2 0.0005815 0.2 AML other m 2023-02-08T22:12:25.24
IV.TRIF.CHN. ML:2.0 0.00034599999999999995 0.24 AML other m 2023-02-08T22:12:26.29
IV.CAFI.HHN. ML:1.7 0.00013227605500000002 0.2816 AML other m 2023-02-08T22:12:28.04
IV.CAFI.HHE. ML:1.8 0.000155 0.36 AML other m 2023-02-08T22:12:28.50
IV.CAFI.HNE. ML:1.8 0.00015831909999999998 0.3584 AML other m 2023-02-08T22:12:28.51
IV.CAFI.HNN. ML:1.8 0.00014251585 0.4352 AML other m 2023-02-08T22:12:29.25
IV.ARCI.HHE. ML:1.8 0.00014745724999999998 0.2432 AML other m 2023-02-08T22:12:30.48
IV.ARCI.HHN. ML:1.9 0.000188554 0.2176 AML other m 2023-02-08T22:12:30.42
IV.ARCI.HNN. ML:1.9 0.0001861943 0.2304 AML other m 2023-02-08T22:12:30.42
IV.RUFI.EHE. ML:2.0 0.00023712830000000002 0.2944 AML other m 2023-02-08T22:12:30.44
IV.RUFI.EHN. ML:2.0 0.0002285 0.36 AML other m 2023-02-08T22:12:30.65
IV.ARCI.HNE. ML:1.8 0.00014627449999999998 0.256 AML other m 2023-02-08T22:12:30.96
IV.CASP.HHN. ML:2.1 0.00022199999999999998 0.36 AML other m 2023-02-08T22:12:35.29
IV.CRE.HHN. ML:1.9 0.00015364895000000002 0.256 AML other m 2023-02-08T22:12:35.11
IV.CASP.HHE. ML:1.8 0.0001215 0.36 AML other m 2023-02-08T22:12:35.69
IV.CRE.HHE. ML:2.0 0.00018002162 0.3968 AML other m 2023-02-08T22:12:35.75
IV.SFI.EHN. ML:1.8 0.000094273695 1.68 AML other m 2023-02-08T22:12:36.85
IV.PII.HHN. ML:2.4 0.00033899999999999995 0.34 AML other m 2023-02-08T22:12:36.03
IV.CASP.HNN. ML:2.1 0.00021323185 0.3328 AML other m 2023-02-08T22:12:36.61
IV.SFI.EHE. ML:2.0 0.00013629642 0.5632 AML other m 2023-02-08T22:12:38.39
IV.PII.HHE. ML:2.2 0.0002148439 0.2816 AML other m 2023-02-08T22:12:38.48
IV.MGAB.HHN. ML:1.8 0.00008334693 0.2304 AML other m 2023-02-08T22:12:39.79
IV.LMD.HHE. ML:1.9 0.00010153057 0.32 AML other m 2023-02-08T22:12:41.04
IV.LMD.HHN. ML:1.8 0.000074257035 0.256 AML other m 2023-02-08T22:12:41.85
IV.MGAB.HHE. ML:1.8 0.00009173675 1.6032 AML other m 2023-02-08T22:12:41.88
IV.PARC.HHE. ML:1.8 0.00008350273 0.3968 AML other m 2023-02-08T22:12:43.44
IV.PARC.HHN. ML:1.7 0.00007014999999999998 0.42 AML other m 2023-02-08T22:12:43.49
IV.CASP.HNE. ML:2.0 0.00014860794999999998 1.6288 AML other m 2023-02-08T22:12:56.18
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