Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 25-09-2023 and time 21:52:11 (Italy) in region 6 km NW Chiusdino (SI)

A magnitude ML 1.1 earthquake occured in region: 6 km NW Chiusdino (SI), on

  • 25-09-2023 19:52:11 (UTC)
  • 25-09-2023 21:52:11 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.1980, 11.0490 at 10 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
Chiusdino SI 6 1903 1903
Radicondoli SI 7 914 2817
Montieri GR 8 1204 4021
Castelnuovo di Val di Cecina PI 12 2231 6252
Monticiano SI 12 1571 7823
Casole d'Elsa SI 16 3897 11720
Monterotondo Marittimo GR 17 1371 13091
Sovicille SI 17 10116 23207
Pomarance PI 18 5897 29104

Municipalities with at least 50000 inhabitants

An earthquake occurred to
27 Km SW of Siena (53903 inhabitants)
49 Km N of Grosseto (82087 inhabitants)
63 Km S of Scandicci (50609 inhabitants)
66 Km S of Firenze (382808 inhabitants)
72 Km SE of Livorno (159219 inhabitants)
74 Km W of Arezzo (99543 inhabitants)
76 Km S of Prato (191150 inhabitants)
78 Km SE of Pisa (89158 inhabitants)
83 Km S of Pistoia (90315 inhabitants)
84 Km SE of Lucca (89046 inhabitants)
99 Km SE of Viareggio (62467 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 1.1 2023-09-25
19:52:11		 43.1977 11.0492 10 2023-09-25
20:07:53		 Sala Sismica INGV-Roma 121453651
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-09-25 19:52:11 ± 0.08
Latitude 43.1977 ± 0.0054
Longitude 11.0492 ± 0.0086
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 121453651

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 792
Semi-minor axis of confidence ellipse (meter) 252
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 122
Circular confidence region, given by single value of horizontal uncertainty (meter) 790.0
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 30
Number of defining phases 21
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.25
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 1.12055
Number of stations at which the event was observed 21
Number of stations from which data was used for origin computation 13
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 121453651
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-09-25 20:07:53
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.TRAV.HHZ. 2023-09-25T19:53:50.64 3.0 undecidable manual Sg 7.54 0
IV.PAOL.HHZ. 2023-09-25T19:53:50.80 3.0 undecidable manual Sn 4.94 0
IV.TRIV.HHZ. 2023-09-25T19:53:48.90 3.0 undecidable manual Sg 13.78 0
MN.TRI.HHZ. 2023-09-25T19:53:47.67 3.0 undecidable manual Sg 7.69 0
IV.ISNA.HHZ. 2023-09-25T19:53:43.85 3.0 positive manual Pg 11.08 0
IV.MCRV.HHZ. 2023-09-25T19:53:25.11 3.0 undecidable manual Pg 13.7 0
IV.PAOL.HHZ. 2023-09-25T19:53:17.14 3.0 undecidable manual Pg 12.71 0
IV.MRGE.HHZ. 2023-09-25T19:53:17.30 3.0 undecidable manual Pn 7.13 0
IV.VITU.HHZ. 2023-09-25T19:53:04.53 3.0 undecidable manual Pn 0.93 0
IV.ATFO.HHZ. 2023-09-25T19:52:31.20 0.3 undecidable manual P 81 124.3866 50 -0.72 50
IV.FNVD.HHN. 2023-09-25T19:52:29.80 0.6 undecidable manual P 3 107.8143 50 0.43 39
IV.ARCI.HNZ. 2023-09-25T19:52:28.25 0.6 undecidable manual S 138 51.6039 50 0.52 42
GU.MAIM.HHZ. 2023-09-25T19:52:27.11 0.6 undecidable manual P 331 91.1421 50 0.3 41
IV.CASP.HHZ. 2023-09-25T19:52:26.47 0.6 undecidable manual S 198 47.5191 50 -0.17 46
IV.MPPT.EHZ. 2023-09-25T19:52:25.56 1.0 undecidable manual P 2 84.3489 50 -0.2 21
IV.RUFI.EHE. 2023-09-25T19:52:24.96 0.6 undecidable manual P 27 80.0643 50 -0.14 43
IV.OSSC.HHZ. 2023-09-25T19:52:24.49 0.6 undecidable manual S 24 39.4272 50 0 48
IV.CSNT.HHZ. 2023-09-25T19:52:23.14 0.6 undecidable manual S 32 36.2415 50 -0.48 44
IV.CASP.HHZ. 2023-09-25T19:52:20.55 0.6 undecidable manual P 198 47.5191 50 0.46 43
IV.ARCI.HNZ. 2023-09-25T19:52:20.46 0.6 undecidable manual P 138 51.6039 50 -0.26 45
IV.RIBO.EHZ.01 2023-09-25T19:52:20.88 0.6 undecidable manual S 180 27.5502 109 -0.37 45
IV.LOCA.HHZ. 2023-09-25T19:52:18.90 0.6 undecidable manual S 55 21.0678 114 -0.24 47
IV.OSSC.HHZ. 2023-09-25T19:52:18.86 0.1 undecidable manual P 24 39.4272 50 0.02 96
IV.CSNT.HHZ. 2023-09-25T19:52:18.38 0.1 undecidable manual P 32 36.2415 50 0.04 96
IV.RIBO.EHZ.01 2023-09-25T19:52:17.24 0.3 undecidable manual P 180 27.5502 109 0.27 70
IV.TRIF.CHZ. 2023-09-25T19:52:16.82 0.6 undecidable manual S 232 14.9739 122 -0.47 45
IV.FROS.CHZ. 2023-09-25T19:52:15.49 0.6 undecidable manual S 81 8.7801 137 -0.12 50
IV.LOCA.HHZ. 2023-09-25T19:52:15.96 0.1 undecidable manual P 55 21.0678 114 0.21 95
IV.TRIF.CHZ. 2023-09-25T19:52:14.70 0.1 undecidable manual P 232 14.9739 122 0.02 100
IV.FROS.CHZ. 2023-09-25T19:52:13.99 0.1 undecidable manual P 81 8.7801 137 0.28 96
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FROS.CHN. ML:1.5 0.00040300000000000004 0.32 AML other m 2023-09-25T19:52:15.82
IV.FROS.CHE. ML:1.3 0.00027100000000000003 0.32 AML other m 2023-09-25T19:52:15.82
IV.TRIF.CHE. ML:1.5 0.000313 0.24 AML other m 2023-09-25T19:52:17.35
IV.TRIF.CHN. ML:1.3 0.00018099999999999998 0.18 AML other m 2023-09-25T19:52:17.72
IV.RIBO.EHE.01 ML:0.9 0.000037886915 0.2432 AML other m 2023-09-25T19:52:23.84
IV.RIBO.EHN.01 ML:1.1 0.00006439374 0.576 AML other m 2023-09-25T19:52:22.02
IV.CSNT.HHE. ML:0.6 0.000016492344999999998 0.2432 AML other m 2023-09-25T19:52:23.82
IV.CSNT.HHN. ML:0.6 0.0000142765415 0.2432 AML other m 2023-09-25T19:52:23.42
IV.CASP.HHE. ML:1.0 0.00002300661 1.344 AML other m 2023-09-25T19:52:29.20
IV.CASP.HHN. ML:1.0 0.00002846111 1.2672 AML other m 2023-09-25T19:52:31.46
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