Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 09-02-2023 and time 03:15:12 (UTC) in region 1 km E Siena (SI)

A magnitude ML 1.4 earthquake occured in region: 1 km E Siena (SI), on

  • 09-02-2023 03:15:12 (UTC)
  • 09-02-2023 04:15:12 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.3220, 11.3480 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.

Hai sentito il terremoto? Clicca qui

Did you feel it? Fill in the questionnaire.

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 1 53903 53903
Sovicille SI 11 10116 64019
Monteroni d'Arbia SI 12 9088 73107
Castelnuovo Berardenga SI 13 9097 82204
Monteriggioni SI 13 9810 92014
Murlo SI 17 2389 94403
Castellina in Chianti SI 17 2859 97262
Gaiole in Chianti SI 18 2758 100020
Radda in Chianti SI 19 1613 101633
Asciano SI 20 7118 108751

Municipalities with at least 50000 inhabitants

An earthquake occurred to
1 Km E of Siena (53903 inhabitants)
46 Km W of Arezzo (99543 inhabitants)
50 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)
76 Km SE of Pistoia (90315 inhabitants)
88 Km W of Perugia (166134 inhabitants)
88 Km E of Livorno (159219 inhabitants)
88 Km SE of Pisa (89158 inhabitants)
90 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 1.4 2023-02-09
03:15:12		 43.3215 11.3482 9 2024-03-01
17:17:56		 Bollettino Sismico Italiano INGV 114597881
Reviewed
Rev100 		ML 1.4 2023-02-09
03:15:12		 43.3242 11.3682 7 2023-02-09
03:23:36		 Sala Sismica INGV-Roma 114278831
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-02-09 03:15:12 ± 0.12
Latitude 43.3215 ± 0.0054
Longitude 11.3482 ± 0.0124
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 114597881

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 976
Semi-minor axis of confidence ellipse (meter) 569
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 292
Circular confidence region, given by single value of horizontal uncertainty (meter) 980.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 102
Number of associated phases, regardless of their use for origin computation 29
Number of defining phases 21
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) 0.63672
Number of stations at which the event was observed 18
Number of stations from which data was used for origin computation 11
Magnitudes information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.2
Num. used stations 15
Type of magnitude ML
Reference to an origin 114597881
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2023-09-18 13:18:59

ML:1.4

Field Value
Value 1.4
Uncertainty 0.2
Num. used stations 13
Type of magnitude ML
Reference to an origin 114278831
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-02-09 03:23:36
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
MN.TRI.HHZ. 2023-02-09T03:16:47.09 3.0 undecidable manual Sg 12.43 0
OX.DRE.HHZ. 2023-02-09T03:16:43.05 3.0 undecidable manual Sn -0.06 0
IV.MGR.HHZ. 2023-02-09T03:16:18.25 3.0 undecidable manual Pn -1.08 0
IV.MSSA.HHZ. 2023-02-09T03:16:11.14 3.0 undecidable manual Sg 5.96 0
CH.MUGIO.HHZ. 2023-02-09T03:16:05.22 3.0 undecidable manual Pn 4.05 0
CH.BERNI.HHZ. 2023-02-09T03:16:04.81 3.0 undecidable manual Pn 1.72 0
IV.CAMP.HHZ. 2023-02-09T03:16:03.30 3.0 undecidable manual Sn -0.57 0
IV.MSSA.HHZ. 2023-02-09T03:15:41.80 3.0 negative manual Pn -0.1 0
IV.RUFI.EHN. 2023-02-09T03:15:31.27 0.6 undecidable manual S 13 58.6968 50 -0.01 47
IV.ARCI.HHZ. 2023-02-09T03:15:29.98 0.3 undecidable manual S 169 53.1024 50 0.21 68
IV.CAFI.HHZ. 2023-02-09T03:15:28.72 0.6 undecidable manual S 89 49.9167 50 -0.2 46
IV.TRIF.CHZ. 2023-02-09T03:15:26.30 0.6 undecidable manual S 238 42.7239 50 -0.69 40
IV.CASP.HHZ. 2023-02-09T03:15:25.93 0.3 undecidable manual P 214 70.6737 50 0.69 57
IV.RUFI.EHN. 2023-02-09T03:15:24.08 0.3 undecidable manual P 13 58.6968 50 0.68 59
IV.MALA4.EHN. 2023-02-09T03:15:24.76 0.6 undecidable manual S 163 36.5412 50 -0.6 42
IV.MALA1.EHN. 2023-02-09T03:15:24.80 0.6 undecidable manual S 163 36.741 50 -0.61 42
IV.MALA5.EHN. 2023-02-09T03:15:24.75 0.6 undecidable manual S 163 36.4413 50 -0.58 42
IV.ARCI.HHZ. 2023-02-09T03:15:23.01 0.3 undecidable manual P 169 53.1024 50 0.48 64
IV.CAFI.HHZ. 2023-02-09T03:15:22.08 0.3 undecidable manual P 89 49.9167 50 0.04 71
IV.TRIF.CHZ. 2023-02-09T03:15:21.08 0.3 undecidable manual P 238 42.7239 50 0.15 70
IV.OSSC.HHZ. 2023-02-09T03:15:21.07 0.6 undecidable manual S 340 23.8539 110 -0.4 46
IV.MALA1.EHN. 2023-02-09T03:15:20.05 0.3 undecidable manual P 163 36.741 50 0.04 72
IV.MALA4.EHN. 2023-02-09T03:15:20.15 0.3 undecidable manual P 163 36.5412 50 0.17 70
IV.FROS.CHZ. 2023-02-09T03:15:20.03 0.6 undecidable manual S 231 19.869 114 -0.14 49
IV.CSNT.HHZ. 2023-02-09T03:15:19.02 0.6 undecidable manual S 345 17.4714 117 -0.4 46
IV.MALA5.EHN. 2023-02-09T03:15:19.87 0.3 undecidable manual P 163 36.4413 50 -0.09 72
IV.OSSC.HHZ. 2023-02-09T03:15:17.67 0.1 undecidable manual P 340 23.8539 110 -0.07 98
IV.FROS.CHZ. 2023-02-09T03:15:17.20 0.1 undecidable manual P 231 19.869 114 0.21 96
IV.CSNT.HHZ. 2023-02-09T03:15:16.53 0.1 undecidable manual P 345 17.4714 117 -0.02 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CSNT.HHN. ML:1.5 0.00026250000000000004 0.48 AML other m 2023-02-09T03:15:19.33
IV.CSNT.HHE. ML:1.6 0.00035787595 0.1008 AML other m 2023-02-09T03:15:19.43
IV.FROS.CHE. ML:1.7 0.00037750249999999995 0.216 AML other m 2023-02-09T03:15:20.12
IV.OSSC.HHN. ML:1.4 0.00017715685 0.2208 AML other m 2023-02-09T03:15:21.40
IV.OSSC.HHE. ML:1.7 0.00032599999999999996 0.18 AML other m 2023-02-09T03:15:21.46
IV.FROS.CHN. ML:1.7 0.00040100000000000004 1.68 AML other m 2023-02-09T03:15:22.85
IV.TRIF.CHN. ML:1.2 0.00005613639499999999 0.112 AML other m 2023-02-09T03:15:27.26
IV.TRIF.CHE. ML:1.4 0.00007748242999999999 0.176 AML other m 2023-02-09T03:15:27.75
IV.CAFI.HHN. ML:1.1 0.000032421545 0.2208 AML other m 2023-02-09T03:15:29.33
IV.CAFI.HHE. ML:1.1 0.00003468727 0.3392 AML other m 2023-02-09T03:15:29.58
IV.CAFI.HNE. ML:1.2 0.000039735865000000004 0.3696 AML other m 2023-02-09T03:15:29.58
IV.ARCI.HHN. ML:1.2 0.000039435603999999997 0.1392 AML other m 2023-02-09T03:15:31.32
IV.ARCI.HHE. ML:1.3 0.000046177819 0.1984 AML other m 2023-02-09T03:15:31.98
IV.CASP.HHN. ML:1.4 0.0000472 0.3 AML other m 2023-02-09T03:15:36.96
IV.CASP.HHE. ML:1.4 0.000043412545 0.36 AML other m 2023-02-09T03:15:37.03
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