Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.8 on date 11-02-2023 and time 03:30:58 (Italy) in region 3 km E Siena (SI)

A magnitude ML 1.8 earthquake occured in region: 3 km E Siena (SI), on

  • 11-02-2023 02:30:58 (UTC)
  • 11-02-2023 03:30:58 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.3090, 11.3680 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
Sovicille SI 12 10116 73107
Castelnuovo Berardenga SI 12 9097 82204
Monteriggioni SI 15 9810 92014
Murlo SI 16 2389 94403
Asciano SI 18 7118 101521
Gaiole in Chianti SI 19 2758 104279
Castellina in Chianti SI 19 2859 107138
Rapolano Terme SI 19 5249 112387
Radda in Chianti SI 20 1613 114000

Municipalities with at least 50000 inhabitants

An earthquake occurred to
3 Km E of Siena (53903 inhabitants)
45 Km W of Arezzo (99543 inhabitants)
52 Km S of Firenze (382808 inhabitants)
52 Km S of Scandicci (50609 inhabitants)
64 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 SE 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 1.8 2023-02-11
02:30:58		 43.3092 11.3677 9 2024-03-01
17:18:06		 Bollettino Sismico Italiano INGV 116955831
Reviewed
Rev100 		ML 1.8 2023-02-11
02:30:58		 43.3245 11.3663 8 2023-02-11
02:39:17		 Sala Sismica INGV-Roma 114331331
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-02-11 02:30:58 ± 0.11
Latitude 43.3092 ± 0.0036
Longitude 11.3677 ± 0.0087
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 116955831

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 579
Semi-minor axis of confidence ellipse (meter) 410
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 278
Circular confidence region, given by single value of horizontal uncertainty (meter) 580.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 64
Number of associated phases, regardless of their use for origin computation 48
Number of defining phases 48
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) 0.17357
Epicentral distance of station farthest from the epicenter (degree) 0.93709
Number of stations at which the event was observed 30
Number of stations from which data was used for origin computation 30
Magnitudes information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.2
Num. used stations 24
Type of magnitude ML
Reference to an origin 116955831
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2023-09-03 22:15:58

ML:1.8

Field Value
Value 1.8
Uncertainty 0.2
Num. used stations 24
Type of magnitude ML
Reference to an origin 114331331
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-02-11 02:39:17
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SEI.HHZ. 2023-02-11T02:31:23.39 0.6 undecidable manual S 359 82.6506 50 -0.12 45
IV.MOCL.EHZ. 2023-02-11T02:31:22.19 0.6 undecidable manual S 349 78.6657 50 -0.24 44
IV.BOSL.HHE. 2023-02-11T02:31:19.58 0.3 undecidable manual S 0 68.9754 50 -0.27 67
IV.SSP9.EHZ. 2023-02-11T02:31:19.80 0.6 undecidable manual S 64 68.1762 50 0.16 46
IV.CRE.HHZ. 2023-02-11T02:31:17.16 0.3 undecidable manual S 54 58.1973 50 0.17 70
IV.CRMI.HHZ. 2023-02-11T02:31:17.23 0.6 undecidable manual S 330 62.2932 50 -0.85 38
IV.BDI.HHZ. 2023-02-11T02:31:16.91 0.3 undecidable manual P 324 104.0181 50 0.67 56
IV.RUFI.EHE. 2023-02-11T02:31:16.54 0.6 undecidable manual S 11 59.7957 50 -0.85 38
GU.POPM.HHZ. 2023-02-11T02:31:15.58 0.3 undecidable manual P 329 95.238 50 0.7 56
TV.SF11.HHZ. 2023-02-11T02:31:15.25 0.3 undecidable manual S 153 55.0005 50 -0.87 57
IV.ARCI.HHZ. 2023-02-11T02:31:14.64 0.6 undecidable manual S 170 51.5151 50 -0.54 43
IV.LMD.HHZ. 2023-02-11T02:31:14.04 0.6 undecidable manual P 18 89.4438 50 0.05 45
IV.CAFI.HHZ. 2023-02-11T02:31:13.49 0.3 undecidable manual S 87 48.4182 50 -0.86 57
IV.SEI.HHZ. 2023-02-11T02:31:13.06 0.6 undecidable manual P 359 82.6506 50 0.12 45
IV.PARC.HHZ. 2023-02-11T02:31:12.86 0.3 undecidable manual P 61 79.5648 50 0.39 64
IV.MPPT.EHZ. 2023-02-11T02:31:12.27 0.3 undecidable manual P 343 75.2691 50 0.46 64
IV.SFI.HNN. 2023-02-11T02:31:12.65 0.1 undecidable manual P 30 76.4679 50 0.66 79
IV.TRIF.CHZ. 2023-02-11T02:31:12.75 0.3 undecidable manual S 240 43.3233 50 -0.26 71
IV.PII.HHZ. 2023-02-11T02:31:12.91 0.3 undecidable manual P 304 81.7515 50 0.1 68
IV.MOCL.EHZ. 2023-02-11T02:31:12.52 0.6 undecidable manual P 349 78.6657 50 0.2 45
IV.SSP9.EHZ. 2023-02-11T02:31:11.27 0.1 undecidable manual P 64 68.1762 50 0.56 84
IV.CASP.HHZ. 2023-02-11T02:31:11.88 0.1 undecidable manual P 215 70.4739 50 0.81 75
IV.SACS.HHZ. 2023-02-11T02:31:11.05 0.3 undecidable manual P 139 67.377 50 0.47 65
IV.VMGN.HHN. 2023-02-11T02:31:11.89 0.3 undecidable manual P 10 72.7716 50 0.46 64
IV.MGAB.HHZ. 2023-02-11T02:31:11.96 0.3 undecidable manual P 126 74.6697 50 0.25 67
IV.CRMI.HHZ. 2023-02-11T02:31:10.02 0.1 undecidable manual P 330 62.2932 50 0.21 92
IV.MALA4.EHZ. 2023-02-11T02:31:10.19 0.3 undecidable manual S 165 34.8429 50 -0.55 67
IV.MALA1.EHN. 2023-02-11T02:31:10.37 0.3 undecidable manual S 165 35.0427 50 -0.41 69
IV.MALA5.EHN. 2023-02-11T02:31:10.24 0.6 undecidable manual S 165 34.743 50 -0.46 46
IV.BOSL.HHE. 2023-02-11T02:31:10.98 0.3 undecidable manual P 0 68.9754 50 0.14 69
IV.MALA2.EHN. 2023-02-11T02:31:10.35 0.1 undecidable manual S 165 35.0427 50 -0.45 92
IV.MCIV.CHE. 2023-02-11T02:31:10.25 0.3 undecidable manual P 157 63.9915 50 0.19 69
IV.RUFI.EHE. 2023-02-11T02:31:09.44 0.3 undecidable manual P 11 59.7957 50 0.03 72
IV.CRE.HHZ. 2023-02-11T02:31:09.72 0.1 undecidable manual P 54 58.1973 50 0.54 86
IV.ARCI.HHZ. 2023-02-11T02:31:08.13 0.3 undecidable manual P 170 51.5151 50 -0.01 73
TV.SF11.HHZ. 2023-02-11T02:31:08.95 0.3 undecidable manual P 153 55.0005 50 0.27 69
IV.CAFI.HHZ. 2023-02-11T02:31:07.70 0.1 undecidable manual P 87 48.4182 50 0.04 98
IV.OSSC.HHZ. 2023-02-11T02:31:07.16 0.1 undecidable manual S 338 25.752 109 -0.81 82
IV.TRIF.CHZ. 2023-02-11T02:31:06.91 0.1 undecidable manual P 240 43.3233 50 0.03 99
IV.FROS.CHZ. 2023-02-11T02:31:06.57 0.1 undecidable manual S 237 20.3685 114 0.34 97
IV.CSNT.HHZ. 2023-02-11T02:31:05.16 0.1 undecidable manual S 341 19.2696 115 -0.72 86
IV.MALA5.EHN. 2023-02-11T02:31:05.49 0.1 undecidable manual P 165 34.743 50 -0.06 100
IV.MALA4.EHZ. 2023-02-11T02:31:05.55 0.3 undecidable manual P 165 34.8429 50 -0.02 75
IV.MALA1.EHN. 2023-02-11T02:31:05.50 0.3 undecidable manual P 165 35.0427 50 -0.1 74
IV.MALA2.EHN. 2023-02-11T02:31:05.56 0.1 undecidable manual P 165 35.0427 50 -0.05 100
IV.FROS.CHZ. 2023-02-11T02:31:03.25 0.1 undecidable manual P 237 20.3685 114 0.28 98
IV.OSSC.HHZ. 2023-02-11T02:31:03.51 0.3 undecidable manual P 338 25.752 109 -0.47 70
IV.CSNT.HHZ. 2023-02-11T02:31:02.38 0.1 undecidable manual P 341 19.2696 115 -0.39 96
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CSNT.HHN. ML:2.2 0.0014399999999999999 0.26 AML other m 2023-02-11T02:31:05.53
IV.CSNT.HHE. ML:2.4 0.002 0.28 AML other m 2023-02-11T02:31:05.40
IV.FROS.CHE. ML:1.9 0.0006475 0.12 AML other m 2023-02-11T02:31:06.61
IV.FROS.CHN. ML:2.2 0.00128 0.16 AML other m 2023-02-11T02:31:07.17
IV.OSSC.HHE. ML:2.0 0.000628 0.12 AML other m 2023-02-11T02:31:07.52
IV.OSSC.HHN. ML:2.0 0.0006605000000000001 0.14 AML other m 2023-02-11T02:31:07.64
IV.TRIF.CHE. ML:1.8 0.0001915 0.88 AML other m 2023-02-11T02:31:13.58
IV.TRIF.CHN. ML:1.8 0.0002075 0.12 AML other m 2023-02-11T02:31:13.65
IV.CAFI.HHN. ML:1.8 0.0001605 1.58 AML other m 2023-02-11T02:31:14.79
IV.CAFI.HHE. ML:1.6 0.0001085 0.66 AML other m 2023-02-11T02:31:14.33
IV.ARCI.HHN. ML:1.9 0.0001865 0.44 AML other m 2023-02-11T02:31:16.68
IV.ARCI.HNN. ML:1.8 0.000174 1.62 AML other m 2023-02-11T02:31:16.09
IV.ARCI.HNE. ML:1.9 0.0001825 0.9 AML other m 2023-02-11T02:31:17.10
IV.ARCI.HHE. ML:1.9 0.000183 0.92 AML other m 2023-02-11T02:31:17.09
IV.CRE.HHE. ML:1.8 0.00013350000000000002 1.54 AML other m 2023-02-11T02:31:17.87
IV.CRE.HHN. ML:1.7 0.00011649999999999999 1.1 AML other m 2023-02-11T02:31:18.94
IV.MPPT.EHE. ML:1.7 0.0000702 0.5 AML other m 2023-02-11T02:31:22.66
IV.CASP.HHN. ML:1.7 0.00008410000000000001 0.6 AML other m 2023-02-11T02:31:23.18
IV.CASP.HHE. ML:1.7 0.0000734 0.26 AML other m 2023-02-11T02:31:23.28
IV.MPPT.EHN. ML:1.5 0.000047 0.82 AML other m 2023-02-11T02:31:25.39
IV.PII.HHE. ML:1.6 0.00005215 0.22 AML other m 2023-02-11T02:31:25.45
IV.PII.HHN. ML:1.8 0.00007825 1.28 AML other m 2023-02-11T02:31:26.86
GU.POPM.HHN. ML:1.6 0.0000413 0.76 AML other m 2023-02-11T02:31:30.86
GU.POPM.HHE. ML:1.6 0.0000395 0.78 AML other m 2023-02-11T02:31:34.77
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