Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 09-02-2023 and time 09:15:46 (UTC) in region 4 km E Siena (SI)

A magnitude ML 1.6 earthquake occured in region: 4 km E Siena (SI), on

  • 09-02-2023 09:15:46 (UTC)
  • 09-02-2023 10:15:46 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.3140, 11.3810 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 4 53903 53903
Monteroni d'Arbia SI 10 9088 62991
Castelnuovo Berardenga SI 11 9097 72088
Sovicille SI 13 10116 82204
Monteriggioni SI 16 9810 92014
Murlo SI 16 2389 94403
Asciano SI 17 7118 101521
Gaiole in Chianti SI 18 2758 104279
Rapolano Terme SI 18 5249 109528
Castellina in Chianti SI 19 2859 112387
Radda in Chianti SI 19 1613 114000

Municipalities with at least 50000 inhabitants

An earthquake occurred to
4 Km E of Siena (53903 inhabitants)
44 Km W of Arezzo (99543 inhabitants)
52 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)
85 Km W of Perugia (166134 inhabitants)
91 Km E of Livorno (159219 inhabitants)
91 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 1.6 2023-02-09
09:15:46		 43.3142 11.3808 8 2024-03-01
17:18:02		 Bollettino Sismico Italiano INGV 116121561
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-02-09 09:15:46 ± 0.13
Latitude 43.3142 ± 0.0054
Longitude 11.3808 ± 0.0124
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 116121561

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 906
Semi-minor axis of confidence ellipse (meter) 621
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 293
Circular confidence region, given by single value of horizontal uncertainty (meter) 910.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 89
Number of associated phases, regardless of their use for origin computation 29
Number of defining phases 29
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) 0.17177
Epicentral distance of station farthest from the epicenter (degree) 0.67989
Number of stations at which the event was observed 18
Number of stations from which data was used for origin computation 18
Magnitude information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations 20
Type of magnitude ML
Reference to an origin 116121561
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2023-10-18 12:36:03
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.RUFI.EHZ. 2023-02-09T09:16:04.75 1.0 undecidable manual S 10 58.9965 50 -0.61 21
TV.SF11.HHZ. 2023-02-09T09:16:03.48 0.6 undecidable manual S 154 55.0005 50 -0.81 38
IV.TRIF.CHZ. 2023-02-09T09:16:01.27 0.6 undecidable manual S 240 44.5221 50 -0.22 47
IV.CAFI.HHZ. 2023-02-09T09:16:01.84 0.6 undecidable manual S 88 47.3193 50 -0.38 45
IV.CASP.HHZ. 2023-02-09T09:16:00.21 0.3 undecidable manual P 216 71.5728 50 0.88 54
IV.SFI.EHZ. 2023-02-09T09:16:00.77 0.6 undecidable manual P 30 75.4689 50 0.83 37
IV.MGAB.HHZ. 2023-02-09T09:15:59.47 0.6 undecidable manual P 127 74.0703 50 -0.26 44
IV.SACS.HHE. 2023-02-09T09:15:59.28 0.3 undecidable manual P 140 67.0773 50 0.64 60
IV.CRMI.HNN. 2023-02-09T09:15:58.05 0.3 undecidable manual P 329 62.3931 50 0.13 70
IV.MALA0.EHN. 2023-02-09T09:15:58.44 0.3 undecidable manual S 168 35.0427 50 -0.51 67
IV.MALA5.EHN. 2023-02-09T09:15:58.40 0.3 undecidable manual S 167 34.9428 50 -0.54 67
IV.MALA4.EHZ. 2023-02-09T09:15:58.46 0.6 undecidable manual S 167 35.1426 50 -0.51 45
IV.MCIV.CHE. 2023-02-09T09:15:58.41 0.3 undecidable manual P 158 64.0914 50 0.23 68
IV.MALA1.EHN. 2023-02-09T09:15:58.54 0.6 undecidable manual S 167 35.2425 50 -0.48 45
TV.SF11.HHZ. 2023-02-09T09:15:57.02 0.3 undecidable manual P 154 55.0005 50 0.24 69
IV.RUFI.EHZ. 2023-02-09T09:15:57.92 0.3 undecidable manual P 10 58.9965 50 0.52 64
IV.CRE.HHZ. 2023-02-09T09:15:57.87 0.3 undecidable manual P 53 56.9985 50 0.77 58
IV.TRIF.CHZ. 2023-02-09T09:15:55.36 0.3 undecidable manual P 240 44.5221 50 0.19 71
IV.OSSC.HHZ. 2023-02-09T09:15:55.39 0.3 undecidable manual S 335 25.6521 108 -0.5 69
IV.CAFI.HHZ. 2023-02-09T09:15:55.75 0.3 undecidable manual P 88 47.3193 50 0.16 71
IV.FROS.CHZ. 2023-02-09T09:15:54.72 0.3 undecidable manual S 238 21.5673 111 0.18 74
IV.MALA1.EHN. 2023-02-09T09:15:53.77 0.3 undecidable manual P 167 35.2425 50 0.03 75
IV.MALA0.EHN. 2023-02-09T09:15:53.72 0.3 undecidable manual P 168 35.0427 50 0.02 75
IV.CSNT.HHZ. 2023-02-09T09:15:53.28 0.3 undecidable manual S 338 19.0698 114 -0.47 70
IV.MALA5.EHN. 2023-02-09T09:15:53.82 0.3 undecidable manual P 167 34.9428 50 0.13 73
IV.MALA4.EHZ. 2023-02-09T09:15:53.72 0.1 undecidable manual P 167 35.1426 50 0 100
IV.FROS.CHZ. 2023-02-09T09:15:51.43 0.1 undecidable manual P 238 21.5673 111 0.28 97
IV.OSSC.HHZ. 2023-02-09T09:15:51.66 0.1 undecidable manual P 335 25.6521 108 -0.27 96
IV.CSNT.HHZ. 2023-02-09T09:15:50.50 0.1 undecidable manual P 338 19.0698 114 -0.2 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CSNT.HHE. ML:1.8 0.0005490431500000001 0.1216 AML other m 2023-02-09T09:15:53.56
IV.CSNT.HHN. ML:1.8 0.0005250378 0.1408 AML other m 2023-02-09T09:15:53.71
IV.FROS.CHE. ML:1.9 0.0006315101000000001 0.2048 AML other m 2023-02-09T09:15:55.07
IV.FROS.CHN. ML:2.0 0.0008285 0.16 AML other m 2023-02-09T09:15:55.44
IV.OSSC.HHE. ML:1.7 0.0002735 0.14 AML other m 2023-02-09T09:15:55.87
IV.OSSC.HHN. ML:1.5 0.000186891 0.16 AML other m 2023-02-09T09:15:55.80
IV.CAFI.HHE. ML:1.4 0.000069339995 0.2624 AML other m 2023-02-09T09:16:02.37
IV.CAFI.HNE. ML:1.3 0.00006224807000000001 0.256 AML other m 2023-02-09T09:16:02.38
IV.TRIF.CHE. ML:1.4 0.00008262671500000001 0.2432 AML other m 2023-02-09T09:16:02.60
IV.TRIF.CHN. ML:1.2 0.000050113185000000006 0.1984 AML other m 2023-02-09T09:16:02.79
IV.CAFI.HHN. ML:1.4 0.000081039605 0.3968 AML other m 2023-02-09T09:16:02.84
IV.CAFI.HNN. ML:1.5 0.00008302615 0.4096 AML other m 2023-02-09T09:16:02.85
IV.RUFI.EHE. ML:1.5 0.00007021783499999999 0.4416 AML other m 2023-02-09T09:16:05.67
IV.RUFI.EHN. ML:1.4 0.00005446653 0.3776 AML other m 2023-02-09T09:16:07.27
IV.CRE.HHE. ML:1.3 0.00004110276 0.5248 AML other m 2023-02-09T09:16:07.99
IV.CRE.HHN. ML:1.5 0.00006467332 0.2816 AML other m 2023-02-09T09:16:09.33
IV.CASP.HHN. ML:1.3 0.00002993953 0.2624 AML other m 2023-02-09T09:16:11.09
IV.CASP.HHE. ML:1.5 0.000055054555 0.2816 AML other m 2023-02-09T09:16:11.16
IV.CASP.HNN. ML:2.0 0.000152372565 0.8832 AML other m 2023-02-09T09:16:15.50
IV.SFI.HNE. ML:2.0 0.000163915225 1.0496 AML other m 2023-02-09T09:16:16.59
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