Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 28-10-2023 and time 20:30:41 (UTC) in region 6 km S Sovicille (SI)

A magnitude ML 1.6 earthquake occured in region: 6 km S Sovicille (SI), on

  • 28-10-2023 20:30:41 (UTC)
  • 28-10-2023 22:30:41 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.2270, 11.2360 at 11 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
Sovicille SI 6 10116 10116
Monticiano SI 11 1571 11687
Siena SI 13 53903 65590
Murlo SI 14 2389 67979
Chiusdino SI 14 1903 69882
Monteroni d'Arbia SI 15 9088 78970
Radicondoli SI 16 914 79884
Monteriggioni SI 19 9810 89694

Municipalities with at least 50000 inhabitants

An earthquake occurred to
13 Km SW of Siena (53903 inhabitants)
53 Km N of Grosseto (82087 inhabitants)
59 Km W of Arezzo (99543 inhabitants)
59 Km S of Scandicci (50609 inhabitants)
61 Km S of Firenze (382808 inhabitants)
74 Km S of Prato (191150 inhabitants)
83 Km SE of Pistoia (90315 inhabitants)
83 Km E of Livorno (159219 inhabitants)
87 Km SE of Pisa (89158 inhabitants)
91 Km SE of Lucca (89046 inhabitants)
95 Km W of Perugia (166134 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 1.6 2023-10-28
20:30:41		 43.2267 11.2355 11 2023-10-28
20:42:40		 Sala Sismica INGV-Roma 122524301
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-10-28 20:30:41 ± 0.1
Latitude 43.2267 ± 0.0054
Longitude 11.2355 ± 0.0111
Depth (km) 11 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 122524301

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 975
Semi-minor axis of confidence ellipse (meter) 489
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 290
Circular confidence region, given by single value of horizontal uncertainty (meter) 970.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 141
Number of associated phases, regardless of their use for origin computation 14
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.28
Epicentral distance of station closest to the epicenter (degree) 0.06025
Epicentral distance of station farthest from the epicenter (degree) 0.51261
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitude information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.1
Num. used stations 4
Type of magnitude ML
Reference to an origin 122524301
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-10-28 20:42:40
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ARCI.HNE. 2023-10-28T20:30:56.56 0.3 undecidable manual S 155 45.9207 50 -0.01 71
IV.OSSC.HHZ. 2023-10-28T20:30:53.28 0.3 undecidable manual S 1 32.9448 50 0.16 71
IV.CASP.HHZ. 2023-10-28T20:30:52.48 0.3 undecidable manual P 212 56.8986 50 0.44 64
IV.CSNT.HHZ. 2023-10-28T20:30:51.36 0.3 undecidable manual S 9 27.6501 50 -0.36 69
IV.TRIF.CHZ. 2023-10-28T20:30:51.80 0.1 undecidable manual S 245 29.6481 50 -0.44 90
IV.ARCI.HNE. 2023-10-28T20:30:49.96 0.3 undecidable manual P 155 45.9207 50 -0.38 66
IV.TRIF.CHZ. 2023-10-28T20:30:48.04 0.3 undecidable manual P 245 29.6481 50 0.21 71
IV.RIBO.EHZ.01 2023-10-28T20:30:48.56 0.3 undecidable manual P 207 34.4433 50 0 73
IV.OSSC.HHZ. 2023-10-28T20:30:48.66 0.1 undecidable manual P 1 32.9448 50 0.31 92
IV.CSNT.HHZ. 2023-10-28T20:30:47.72 0.3 undecidable manual P 9 27.6501 50 0.19 71
IV.FROS.CHZ. 2023-10-28T20:30:46.17 0.3 undecidable manual S 254 6.6933 148 -0.06 76
IV.LOCA.HNZ. 2023-10-28T20:30:46.38 0.1 undecidable manual S 14 9.0798 140 -0.34 95
IV.FROS.CHZ. 2023-10-28T20:30:44.61 0.1 undecidable manual P 254 6.6933 148 0.25 97
IV.LOCA.HNZ. 2023-10-28T20:30:44.74 0.1 undecidable manual P 14 9.0798 140 0.09 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FROS.CHE. ML:1.7 0.0007325 0.18 AML other m 2023-10-28T20:30:46.32
IV.FROS.CHN. ML:1.6 0.000693 0.42 AML other m 2023-10-28T20:30:46.35
IV.TRIF.CHE. ML:1.5 0.0001375 1.58 AML other m 2023-10-28T20:30:52.92
IV.TRIF.CHN. ML:1.4 0.000118 0.82 AML other m 2023-10-28T20:30:52.98
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