Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 09-02-2023 and time 20:32:41 (Italy) in region 2 km E Siena (SI)

A magnitude ML 1.6 earthquake occured in region: 2 km E Siena (SI), on

  • 09-02-2023 19:32:41 (UTC)
  • 09-02-2023 20:32:41 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.3160, 11.3610 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 2 53903 53903
Monteroni d'Arbia SI 11 9088 62991
Sovicille SI 11 10116 73107
Castelnuovo Berardenga SI 12 9097 82204
Monteriggioni SI 14 9810 92014
Murlo SI 17 2389 94403
Gaiole in Chianti SI 18 2758 97161
Castellina in Chianti SI 18 2859 100020
Asciano SI 18 7118 107138
Radda in Chianti SI 19 1613 108751

Municipalities with at least 50000 inhabitants

An earthquake occurred to
2 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)
87 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 1.6 2023-02-09
19:32:41		 43.316 11.3612 9 2024-03-01
17:18:00		 Bollettino Sismico Italiano INGV 115628061
Reviewed
Rev100 		ML 1.6 2023-02-09
19:32:41		 43.3172 11.3687 8 2023-02-09
19:42:33		 Sala Sismica INGV-Roma 114306371
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-02-09 19:32:41 ± 0.1
Latitude 43.3160 ± 0.0036
Longitude 11.3612 ± 0.0099
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 115628061

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 771
Semi-minor axis of confidence ellipse (meter) 394
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 285
Circular confidence region, given by single value of horizontal uncertainty (meter) 770.0
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 35
Number of defining phases 35
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.31
Epicentral distance of station closest to the epicenter (degree) 0.16548
Epicentral distance of station farthest from the epicenter (degree) 0.71766
Number of stations at which the event was observed 20
Number of stations from which data was used for origin computation 20
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 115628061
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2023-10-22 16:18:45

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 114306371
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-02-09 19:42:33
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.PARC.HHE. 2023-02-09T19:33:06.00 0.6 undecidable manual S 62 79.6647 50 0.5 42
IV.BOSL.HHZ. 2023-02-09T19:33:02.50 0.3 undecidable manual S 1 68.1762 50 0.06 71
IV.RUFI.EHZ. 2023-02-09T19:32:59.95 0.6 undecidable manual S 12 59.0964 50 -0.05 48
IV.CRE.HHE. 2023-02-09T19:32:59.80 0.3 undecidable manual S 55 58.1973 50 0.03 73
TV.SF11.HHE. 2023-02-09T19:32:58.40 0.3 undecidable manual S 152 55.8996 50 -0.75 60
IV.PARC.HHE. 2023-02-09T19:32:56.00 0.3 undecidable manual P 62 79.6647 50 0.74 57
IV.CAFI.HNZ. 2023-02-09T19:32:56.80 0.3 undecidable manual S 88 48.8178 50 -0.47 67
IV.TRIF.CHE. 2023-02-09T19:32:55.64 0.6 undecidable manual S 239 43.2234 50 -0.13 49
IV.CASP.HHZ. 2023-02-09T19:32:54.89 1.0 undecidable manual P 215 70.7736 50 1.01 17
IV.ATMC.EHE. 2023-02-09T19:32:54.12 0.6 undecidable manual P 77 68.5758 50 0.57 42
IV.VMGN.HHE. 2023-02-09T19:32:54.47 0.6 undecidable manual P 11 72.1722 50 0.37 44
IV.MALA4.EHE. 2023-02-09T19:32:53.30 0.3 undecidable manual S 165 35.742 50 -0.46 69
IV.MALA0.EHE. 2023-02-09T19:32:53.40 0.6 undecidable manual S 165 35.6421 50 -0.33 47
IV.MALA1.EHE. 2023-02-09T19:32:53.38 0.6 undecidable manual S 165 35.8419 50 -0.42 47
IV.MALA2.EHE. 2023-02-09T19:32:53.43 0.6 undecidable manual S 165 35.9418 50 -0.39 47
IV.MCIV.CHE. 2023-02-09T19:32:53.21 0.6 undecidable manual P 157 64.8906 50 0.24 46
IV.MALA5.EHE. 2023-02-09T19:32:53.34 0.6 undecidable manual S 165 35.5422 50 -0.37 47
IV.BOSL.HHZ. 2023-02-09T19:32:53.62 0.3 undecidable manual P 1 68.1762 50 0.13 70
IV.CRE.HHE. 2023-02-09T19:32:52.74 0.3 undecidable manual P 55 58.1973 50 0.8 59
IV.ARCI.HHZ. 2023-02-09T19:32:51.30 0.1 undecidable manual P 170 52.3032 50 0.26 93
IV.RUFI.EHZ. 2023-02-09T19:32:51.62 1.0 undecidable manual P 12 59.0964 50 -0.47 22
TV.SF11.HHE. 2023-02-09T19:32:51.73 0.6 undecidable manual P 152 55.8996 50 0.14 48
IV.CAFI.HNZ. 2023-02-09T19:32:50.71 0.1 undecidable manual P 88 48.8178 50 0.21 95
IV.OSSC.HHZ. 2023-02-09T19:32:49.80 0.3 undecidable manual S 338 24.8529 110 -0.61 67
IV.FROS.CHZ. 2023-02-09T19:32:49.30 0.3 undecidable manual S 235 20.3685 113 0.35 73
IV.TRIF.CHE. 2023-02-09T19:32:49.94 0.3 undecidable manual P 239 43.2234 50 0.29 71
IV.MALA0.EHE. 2023-02-09T19:32:48.49 0.3 undecidable manual P 165 35.6421 50 0.03 76
IV.MALA5.EHE. 2023-02-09T19:32:48.44 0.3 undecidable manual P 165 35.5422 50 -0.02 76
IV.MALA4.EHE. 2023-02-09T19:32:48.46 0.3 undecidable manual P 165 35.742 50 -0.02 76
IV.MALA1.EHE. 2023-02-09T19:32:48.56 0.3 undecidable manual P 165 35.8419 50 0.06 75
IV.MALA2.EHE. 2023-02-09T19:32:48.42 0.3 undecidable manual P 165 35.9418 50 -0.09 75
IV.CSNT.HHZ. 2023-02-09T19:32:47.80 0.3 undecidable manual S 342 18.3705 116 -0.53 70
IV.OSSC.HHZ. 2023-02-09T19:32:46.24 0.1 undecidable manual P 338 24.8529 110 -0.3 97
IV.FROS.CHZ. 2023-02-09T19:32:46.18 0.1 undecidable manual P 235 20.3685 113 0.48 94
IV.CSNT.HHZ. 2023-02-09T19:32:45.12 0.1 undecidable manual P 342 18.3705 116 -0.23 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CSNT.HHN. ML:1.7 0.00044315815 0.0896 AML other m 2023-02-09T19:32:47.89
IV.CSNT.HHE. ML:1.8 0.00051 0.1 AML other m 2023-02-09T19:32:47.95
IV.FROS.CHE. ML:1.8 0.000492 0.16 AML other m 2023-02-09T19:32:49.53
IV.FROS.CHN. ML:1.9 0.00062 1.86 AML other m 2023-02-09T19:32:49.04
IV.OSSC.HHE. ML:1.3 0.000126696965 0.1408 AML other m 2023-02-09T19:32:50.37
IV.OSSC.HHN. ML:1.3 0.00011724317500000001 0.1408 AML other m 2023-02-09T19:32:50.44
IV.RUFI.EHN. ML:1.3 0.00004208630600000001 0.1568 AML other m 2023-02-09T19:32:57.60
IV.RUFI.EHE. ML:1.5 0.000060163695 0.1088 AML other m 2023-02-09T19:33:00.43
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