Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.5 on date 09-02-2023 and time 09:50:26 (UTC) in region 4 km E Siena (SI)

A magnitude ML 1.5 earthquake occured in region: 4 km E Siena (SI), on

  • 09-02-2023 09:50:26 (UTC)
  • 09-02-2023 10:50:26 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.3180, 11.3830 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 10 9097 72088
Sovicille SI 13 10116 82204
Monteriggioni SI 16 9810 92014
Murlo SI 17 2389 94403
Asciano SI 17 7118 101521
Gaiole in Chianti SI 17 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)
51 Km S of Firenze (382808 inhabitants)
52 Km SE of Scandicci (50609 inhabitants)
66 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 1.5 2023-02-09
09:50:26		 43.3182 11.3827 8 2024-03-01
17:17:59		 Bollettino Sismico Italiano INGV 115623541
Reviewed
Rev100 		ML 1.7 2023-02-09
09:50:26		 43.3207 11.3552 10 2023-02-09
10:54:07		 Sala Sismica INGV-Roma 114292071
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-02-09 09:50:26 ± 0.12
Latitude 43.3182 ± 0.0054
Longitude 11.3827 ± 0.0111
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 115623541

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 868
Semi-minor axis of confidence ellipse (meter) 538
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) 870.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 94
Number of associated phases, regardless of their use for origin computation 33
Number of defining phases 25
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) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.64841
Number of stations at which the event was observed 22
Number of stations from which data was used for origin computation 14
Magnitudes information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.3
Num. used stations 5
Type of magnitude ML
Reference to an origin 115623541
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2023-10-20 14:03:12

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations 6
Type of magnitude ML
Reference to an origin 114292071
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-02-09 10:54:07
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
AC.PUK.HHZ. 2023-02-09T09:52:00.12 3.0 undecidable manual Pg 14.53 0
IV.CDRU.HHZ. 2023-02-09T09:51:59.60 3.0 undecidable manual Sn -1.24 0
IV.CROCE.HHZ. 2023-02-09T09:51:55.79 3.0 positive manual Pn -1.33 0
IV.MTMR.HNZ. 2023-02-09T09:51:50.57 3.0 undecidable manual Sg 1.35 0
ST.OZOL.EHZ. 2023-02-09T09:51:46.53 3.0 undecidable manual Sn -2.19 0
IV.TDS.HHZ. 2023-02-09T09:51:32.24 3.0 positive manual Pn 1.09 0
IV.MSSA.HHZ. 2023-02-09T09:51:31.66 3.0 undecidable manual Sg 8.8 0
IV.PAOL.HHZ. 2023-02-09T09:51:10.69 3.0 undecidable manual Pg 5.87 0
IV.RUFI.EHE. 2023-02-09T09:50:45.07 0.6 undecidable manual S 10 58.5969 50 0.22 45
TV.SF11.HHN. 2023-02-09T09:50:44.05 0.3 undecidable manual S 154 55.3002 50 0.06 71
IV.ARCI.HNE. 2023-02-09T09:50:43.48 0.6 undecidable manual S 172 52.2033 50 0.31 45
IV.CAFI.HHE. 2023-02-09T09:50:41.34 0.3 undecidable manual S 88 47.1195 50 -0.46 66
IV.TRIF.CHZ. 2023-02-09T09:50:40.78 0.6 undecidable manual S 240 44.9217 50 -0.42 44
IV.CASP.HHE. 2023-02-09T09:50:39.92 0.6 undecidable manual P 216 71.9724 50 0.91 35
IV.MCIV.CHE. 2023-02-09T09:50:38.22 0.3 undecidable manual P 158 64.3911 50 0.37 65
IV.MALA5.EHZ. 2023-02-09T09:50:38.04 0.6 undecidable manual S 167 35.3424 50 -0.62 42
IV.MALA4.EHZ. 2023-02-09T09:50:38.14 0.3 undecidable manual S 167 35.5422 50 -0.56 65
IV.MALA1.EHZ. 2023-02-09T09:50:38.19 0.3 undecidable manual S 168 35.6421 50 -0.55 65
IV.RUFI.EHE. 2023-02-09T09:50:37.24 0.6 undecidable manual P 10 58.5969 50 0.29 45
IV.CRE.HHZ. 2023-02-09T09:50:37.53 0.6 undecidable manual P 54 56.6988 50 0.88 37
IV.ARCI.HNE. 2023-02-09T09:50:36.09 0.3 undecidable manual P 172 52.2033 50 0.12 70
TV.SF11.HHN. 2023-02-09T09:50:36.73 0.6 undecidable manual P 154 55.3002 50 0.28 45
IV.TRIF.CHZ. 2023-02-09T09:50:35.19 0.3 undecidable manual P 240 44.9217 50 0.35 68
IV.OSSC.HHZ. 2023-02-09T09:50:35.07 0.3 undecidable manual S 334 25.3524 108 -0.32 70
IV.CAFI.HHE. 2023-02-09T09:50:35.41 0.3 undecidable manual P 88 47.1195 50 0.23 69
IV.FROS.CHZ. 2023-02-09T09:50:34.24 0.3 undecidable manual S 237 21.867 111 -0.03 75
IV.MALA1.EHZ. 2023-02-09T09:50:33.47 0.3 undecidable manual P 168 35.6421 50 0.05 73
IV.CSNT.HHZ. 2023-02-09T09:50:33.02 0.3 undecidable manual S 337 18.7701 114 -0.24 73
IV.MALA5.EHZ. 2023-02-09T09:50:33.47 0.3 undecidable manual P 167 35.3424 50 0.1 73
IV.MALA4.EHZ. 2023-02-09T09:50:33.31 0.3 undecidable manual P 167 35.5422 50 -0.08 73
IV.FROS.CHZ. 2023-02-09T09:50:31.06 0.1 undecidable manual P 237 21.867 111 0.22 97
IV.OSSC.HHZ. 2023-02-09T09:50:31.24 0.3 undecidable manual P 334 25.3524 108 -0.25 72
IV.CSNT.HHZ. 2023-02-09T09:50:30.17 0.1 undecidable manual P 337 18.7701 114 -0.08 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CSNT.HHE. ML:1.7 0.0003845 0.16 AML other m 2023-02-09T09:50:33.22
IV.CSNT.HHN. ML:1.6 0.00033048604999999997 0.1984 AML other m 2023-02-09T09:50:33.33
IV.FROS.CHE. ML:1.9 0.0005531215499999999 0.1728 AML other m 2023-02-09T09:50:34.68
IV.OSSC.HHN. ML:1.2 0.00009148873499999999 0.1216 AML other m 2023-02-09T09:50:35.40
IV.OSSC.HHE. ML:1.2 0.0001030712 0.1408 AML other m 2023-02-09T09:50:35.82
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