Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.0 on date 09-02-2023 and time 08:19:30 (UTC) in region 4 km E Siena (SI)

A magnitude ML 2.0 earthquake occured in region: 4 km E Siena (SI), on

  • 09-02-2023 08:19:30 (UTC)
  • 09-02-2023 09:19:30 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.3200, 11.3840 at 8 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

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
Castelnuovo Berardenga SI 10 9097 63000
Monteroni d'Arbia SI 10 9088 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 Pisa (89158 inhabitants)
91 Km E of Livorno (159219 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
Reviewed
Rev100 		ML 2.0 2023-02-09
08:19:30		 43.3197 11.3843 8 2023-02-09
08:30:31		 Sala Sismica INGV-Roma 114286621
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-02-09 08:19:30 ± 0.17
Latitude 43.3197 ± 0.0063
Longitude 11.3843 ± 0.0223
Depth (km) 8 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 114286621

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1806
Semi-minor axis of confidence ellipse (meter) 600
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 282
Circular confidence region, given by single value of horizontal uncertainty (meter) 1810.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 97
Number of associated phases, regardless of their use for origin computation 22
Number of defining phases 19
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.35
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.52610
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 10
Magnitude information

ML:2.0

Field Value
Value 2.0
Uncertainty 0.2
Num. used stations 12
Type of magnitude ML
Reference to an origin 114286621
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-02-09 08:30:31
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
GU.CARD.HHZ. 2023-02-09T08:20:02.54 3.0 undecidable manual S -1.69 0
IV.ATMI.HHZ. 2023-02-09T08:19:53.32 3.0 undecidable manual S -1.01 0
IV.RUFI.EHZ. 2023-02-09T08:19:49.56 0.3 undecidable manual S 10 0.5261 50 0 70
IV.ARCI.HHZ. 2023-02-09T08:19:48.54 0.6 undecidable manual S 172 0.4721 50 0.57 42
IV.CAFI.HHZ. 2023-02-09T08:19:46.10 0.3 undecidable manual S 88 0.4236 50 -0.42 66
IV.PARC.HHZ. 2023-02-09T08:19:45.62 3.0 negative manual P 0.94 0
IV.RUFI.EHZ. 2023-02-09T08:19:42.35 0.3 undecidable manual P 10 0.5261 50 0.67 59
IV.CRE.HHZ. 2023-02-09T08:19:42.35 1.0 negative manual P 54 0.5090 50 0.97 17
IV.MALA1.EHN. 2023-02-09T08:19:42.94 0.3 undecidable manual S 168 0.3229 50 -0.6 64
IV.MALA4.EHN. 2023-02-09T08:19:42.83 0.6 undecidable manual S 168 0.3211 50 -0.66 41
IV.MALA5.EHN. 2023-02-09T08:19:42.80 0.3 undecidable manual S 168 0.3202 50 -0.65 62
IV.ARCI.HHZ. 2023-02-09T08:19:41.25 0.3 negative manual P 172 0.4721 50 0.5 64
IV.CAFI.HHZ. 2023-02-09T08:19:40.28 0.6 negative manual P 88 0.4236 50 0.36 45
IV.FROS.CHZ. 2023-02-09T08:19:39.06 0.3 undecidable manual S 237 0.1988 111 -0.03 75
IV.OSSC.HHZ. 2023-02-09T08:19:39.73 0.3 undecidable manual S 334 0.2275 108 -0.39 69
IV.MALA4.EHN. 2023-02-09T08:19:38.30 0.3 undecidable manual P 168 0.3211 50 0.13 72
IV.MALA5.EHN. 2023-02-09T08:19:38.48 0.3 undecidable manual P 168 0.3202 50 0.33 69
IV.MALA1.EHN. 2023-02-09T08:19:38.37 0.3 undecidable manual P 168 0.3229 50 0.17 71
IV.CSNT.HHZ. 2023-02-09T08:19:37.69 0.3 undecidable manual S 336 0.1682 114 -0.3 71
IV.OSSC.HHZ. 2023-02-09T08:19:36.18 0.1 positive manual P 334 0.2275 108 -0.05 99
IV.FROS.CHZ. 2023-02-09T08:19:35.93 0.3 negative manual P 237 0.1988 111 0.3 71
IV.CSNT.HHZ. 2023-02-09T08:19:34.95 0.1 undecidable manual P 336 0.1682 114 -0.04 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CSNT.HHE. ML:2.2 0.0014335 0.26 AML other m 2023-02-09T08:19:37.95
IV.CSNT.HHN. ML:2.1 0.0010004999999999999 0.26 AML other m 2023-02-09T08:19:38.09
IV.FROS.CHE. ML:2.0 0.000712 0.46 AML other m 2023-02-09T08:19:39.54
IV.FROS.CHN. ML:2.4 0.0015899999999999998 0.16 AML other m 2023-02-09T08:19:39.74
IV.OSSC.HHE. ML:1.8 0.000413 0.4 AML other m 2023-02-09T08:19:40.24
IV.OSSC.HHN. ML:1.8 0.000381 0.26 AML other m 2023-02-09T08:19:40.66
IV.CAFI.HHE. ML:1.5 0.0000924 0.6 AML other m 2023-02-09T08:19:46.53
IV.CAFI.HHN. ML:1.6 0.00012054999999999999 0.4 AML other m 2023-02-09T08:19:47.30
IV.ARCI.HHE. ML:1.9 0.000217 0.88 AML other m 2023-02-09T08:19:49.25
IV.ARCI.HHN. ML:2.0 0.00027949999999999996 0.48 AML other m 2023-02-09T08:19:49.47
IV.CRE.HHN. ML:1.7 0.000106 0.78 AML other m 2023-02-09T08:19:51.43
IV.CRE.HHE. ML:1.7 0.00011850000000000001 1.28 AML other m 2023-02-09T08:19:52.23
IV.ATMI.HHN. ML:2.0 0.00014749999999999998 0.48 AML other m 2023-02-09T08:19:57.68
IV.ATMI.HHE. ML:2.0 0.0001815 0.78 AML other m 2023-02-09T08:19:59.04
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
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