Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.5 on date 09-02-2023 and time 16:59:29 (Italy) in region 3 km E Siena (SI)

A magnitude ML 1.5 earthquake occured in region: 3 km E Siena (SI), on

  • 09-02-2023 15:59:29 (UTC)
  • 09-02-2023 16:59:29 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.3160, 11.3640 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 3 53903 53903
Monteroni d'Arbia SI 11 9088 62991
Sovicille SI 12 10116 73107
Castelnuovo Berardenga SI 12 9097 82204
Monteriggioni SI 15 9810 92014
Murlo SI 16 2389 94403
Gaiole in Chianti SI 18 2758 97161
Asciano SI 18 7118 104279
Castellina in Chianti SI 18 2859 107138
Radda in Chianti SI 19 1613 108751
Rapolano Terme SI 20 5249 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)
51 Km S of Firenze (382808 inhabitants)
51 Km S of Scandicci (50609 inhabitants)
65 Km NE of Grosseto (82087 inhabitants)
66 Km SE of Prato (191150 inhabitants)
78 Km SE of Pistoia (90315 inhabitants)
86 Km W of Perugia (166134 inhabitants)
89 Km E of Livorno (159219 inhabitants)
89 Km SE of Pisa (89158 inhabitants)
91 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
15:59:29		 43.3158 11.3637 8 2024-03-01
17:18:00		 Bollettino Sismico Italiano INGV 115665261
Reviewed
Rev100 		ML 1.6 2023-02-09
15:59:29		 43.3198 11.3965 4 2023-02-09
16:14:53		 Sala Sismica INGV-Roma 114301641
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-02-09 15:59:29 ± 0.12
Latitude 43.3158 ± 0.0054
Longitude 11.3637 ± 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 115665261

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 951
Semi-minor axis of confidence ellipse (meter) 526
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 294
Circular confidence region, given by single value of horizontal uncertainty (meter) 950.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 99
Number of associated phases, regardless of their use for origin computation 36
Number of defining phases 33
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) 0.71676
Number of stations at which the event was observed 21
Number of stations from which data was used for origin computation 18
Magnitudes information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.4
Num. used stations 13
Type of magnitude ML
Reference to an origin 115665261
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2023-10-20 16:15:30

ML:1.6

Field Value
Value 1.6
Uncertainty 0.4
Num. used stations 12
Type of magnitude ML
Reference to an origin 114301641
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-02-09 16:14:53
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.BURY.HHZ. 2023-02-09T16:00:58.84 3.0 undecidable manual Sg 6.02 0
IV.PAOL.HHZ. 2023-02-09T16:00:33.96 3.0 undecidable manual Pg 9.88 0
IV.PTQR.HHZ. 2023-02-09T16:00:08.89 3.0 positive manual Pg 2.92 0
IV.ATMC.EHE. 2023-02-09T15:59:51.48 0.6 undecidable manual S 77 68.376 50 0.94 36
IV.CRE.HHZ. 2023-02-09T15:59:48.10 0.3 undecidable manual S 54 58.0974 50 0.32 68
IV.RUFI.EHE. 2023-02-09T15:59:47.92 0.3 undecidable manual S 11 59.0964 50 -0.13 70
IV.ARCI.HHE. 2023-02-09T15:59:46.73 0.3 undecidable manual S 170 52.2033 50 0.5 66
TV.SF11.HHN. 2023-02-09T15:59:46.30 0.3 undecidable manual S 153 55.7997 50 -0.87 56
IV.CAFI.HHZ. 2023-02-09T15:59:44.81 0.3 undecidable manual S 88 48.618 50 -0.46 67
IV.PARC.HHZ. 2023-02-09T15:59:43.80 0.3 undecidable manual P 62 79.5648 50 0.56 61
IV.TRIF.CHZ. 2023-02-09T15:59:43.70 0.3 undecidable manual S 239 43.4232 50 -0.17 72
IV.CASP.HHZ. 2023-02-09T15:59:42.82 0.3 undecidable manual P 215 70.8735 50 0.91 54
IV.SACS.HHE. 2023-02-09T15:59:42.06 0.3 undecidable manual P 139 68.0763 50 0.58 62
IV.MALA5.EHE. 2023-02-09T15:59:41.27 0.3 undecidable manual S 165 35.4423 50 -0.48 68
IV.MALA2.EHE. 2023-02-09T15:59:41.38 0.3 undecidable manual S 165 35.8419 50 -0.47 68
IV.MALA0.EHE. 2023-02-09T15:59:41.36 0.3 undecidable manual S 165 35.5422 50 -0.4 70
IV.MALA4.EHE. 2023-02-09T15:59:41.32 0.3 undecidable manual S 165 35.6421 50 -0.47 68
IV.ATMC.EHE. 2023-02-09T15:59:41.70 0.6 undecidable manual P 77 68.376 50 0.17 46
IV.MALA1.EHE. 2023-02-09T15:59:41.34 0.3 undecidable manual S 165 35.8419 50 -0.49 68
IV.RUFI.EHE. 2023-02-09T15:59:40.99 0.6 undecidable manual P 11 59.0964 50 0.89 37
IV.CRE.HHZ. 2023-02-09T15:59:40.74 0.3 undecidable manual P 54 58.0974 50 0.8 58
IV.ARCI.HHE. 2023-02-09T15:59:39.21 0.3 undecidable manual P 170 52.2033 50 0.17 71
TV.SF11.HHN. 2023-02-09T15:59:39.74 0.6 undecidable manual P 153 55.7997 50 0.15 47
IV.CAFI.HHZ. 2023-02-09T15:59:38.62 0.3 undecidable manual P 88 48.618 50 0.14 72
IV.TRIF.CHZ. 2023-02-09T15:59:38.02 0.3 undecidable manual P 239 43.4232 50 0.34 69
IV.FROS.CHZ. 2023-02-09T15:59:37.28 0.1 undecidable manual S 235 20.4684 112 0.39 95
IV.OSSC.HHZ. 2023-02-09T15:59:37.79 0.3 undecidable manual S 338 24.9528 109 -0.55 68
IV.MALA4.EHE. 2023-02-09T15:59:36.39 0.1 undecidable manual P 165 35.6421 50 -0.09 99
IV.MALA1.EHE. 2023-02-09T15:59:36.51 0.3 undecidable manual P 165 35.8419 50 0.01 75
IV.MALA5.EHE. 2023-02-09T15:59:36.42 0.3 undecidable manual P 165 35.4423 50 -0.03 75
IV.MALA2.EHE. 2023-02-09T15:59:36.44 0.1 undecidable manual P 165 35.8419 50 -0.07 99
IV.MALA0.EHE. 2023-02-09T15:59:36.42 0.1 undecidable manual P 165 35.5422 50 -0.04 100
IV.CSNT.HHZ. 2023-02-09T15:59:35.75 0.1 undecidable manual S 341 18.4704 114 -0.49 94
IV.FROS.CHZ. 2023-02-09T15:59:34.10 0.1 undecidable manual P 235 20.4684 112 0.45 94
IV.OSSC.HHZ. 2023-02-09T15:59:34.13 0.1 undecidable manual P 338 24.9528 109 -0.36 95
IV.CSNT.HHZ. 2023-02-09T15:59:32.96 0.1 undecidable manual P 341 18.4704 114 -0.31 97
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CSNT.HHE. ML:1.9 0.0007444999999999999 0.1 AML other m 2023-02-09T15:59:35.90
IV.CSNT.HHN. ML:1.9 0.0006745142500000001 0.1024 AML other m 2023-02-09T15:59:35.97
IV.FROS.CHE. ML:2.2 0.0012171791000000001 0.1536 AML other m 2023-02-09T15:59:37.46
IV.FROS.CHN. ML:2.2 0.0011899999999999999 0.16 AML other m 2023-02-09T15:59:37.98
IV.OSSC.HHN. ML:1.5 0.0002002486 0.128 AML other m 2023-02-09T15:59:38.13
IV.OSSC.HHE. ML:1.6 0.00022045504999999998 0.1152 AML other m 2023-02-09T15:59:38.30
IV.CAFI.HHN. ML:1.1 0.00003469442 0.1536 AML other m 2023-02-09T15:59:45.72
IV.CAFI.HHE. ML:1.1 0.000032932415 0.32 AML other m 2023-02-09T15:59:47.82
IV.CAFI.HNE. ML:1.2 0.000042543515 0.32 AML other m 2023-02-09T15:59:47.82
IV.CRE.HHE. ML:1.6 0.00008865 0.5 AML other m 2023-02-09T15:59:48.62
IV.CRE.HHN. ML:1.7 0.00009795 0.34 AML other m 2023-02-09T15:59:52.51
IV.CASP.HHE. ML:1.2 0.000025095559999999998 1.7568 AML other m 2023-02-09T15:59:54.90
IV.CASP.HHN. ML:1.2 0.000022983275000000002 0.1536 AML other m 2023-02-09T15:59:54.42
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