Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 17-02-2023 and time 15:46:09 (Italy) in region 4 km NW Castelnuovo di Val di Cecina (PI)

A magnitude ML 1.6 earthquake occured in region: 4 km NW Castelnuovo di Val di Cecina (PI), on

  • 17-02-2023 14:46:09 (UTC)
  • 17-02-2023 15:46:09 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.2370, 10.8870 at 8 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
Castelnuovo di Val di Cecina PI 4 2231 2231
Pomarance PI 7 5897 8128
Monterotondo Marittimo GR 10 1371 9499
Radicondoli SI 13 914 10413
Monteverdi Marittimo PI 15 758 11171
Montieri GR 16 1204 12375
Casole d'Elsa SI 17 3897 16272
Volterra PI 19 10519 26791
Chiusdino SI 19 1903 28694

Municipalities with at least 50000 inhabitants

An earthquake occurred to
37 Km W of Siena (53903 inhabitants)
56 Km NW of Grosseto (82087 inhabitants)
59 Km SE of Livorno (159219 inhabitants)
63 Km SW of Scandicci (50609 inhabitants)
66 Km SE of Pisa (89158 inhabitants)
66 Km SW of Firenze (382808 inhabitants)
74 Km S of Prato (191150 inhabitants)
74 Km SE of Lucca (89046 inhabitants)
78 Km S of Pistoia (90315 inhabitants)
85 Km W of Arezzo (99543 inhabitants)
87 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
Bulletin
Rev1000 		ML 1.6 2023-02-17
14:46:09		 43.2367 10.8872 8 2024-03-01
17:18:11		 Bollettino Sismico Italiano INGV 118360251
Reviewed
Rev100 		ML 1.4 2023-02-17
14:46:09		 43.2317 10.8932 9 2023-02-17
14:56:54		 Sala Sismica INGV-Roma 114517991
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-02-17 14:46:09 ± 0.15
Latitude 43.2367 ± 0.0063
Longitude 10.8872 ± 0.0111
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 118360251

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 803
Semi-minor axis of confidence ellipse (meter) 626
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 246
Circular confidence region, given by single value of horizontal uncertainty (meter) 800.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 106
Number of associated phases, regardless of their use for origin computation 21
Number of defining phases 21
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) 0.12231
Epicentral distance of station farthest from the epicenter (degree) 1.06390
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 14
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations 16
Type of magnitude ML
Reference to an origin 118360251
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2023-06-13 10:37:34

ML:1.4

Field Value
Value 1.4
Uncertainty 0.2
Num. used stations 18
Type of magnitude ML
Reference to an origin 114517991
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-02-17 14:56:54
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.PARC.HHZ. 2023-02-17T14:46:30.51 0.6 undecidable manual P 67 118.0929 50 0.7 47
IV.ARCI.HHZ. 2023-02-17T14:46:30.15 0.3 undecidable manual S 132 63.9915 50 0.13 91
IV.CRMI.HHZ. 2023-02-17T14:46:29.08 0.3 undecidable manual S 7 62.3931 50 -0.53 84
IV.PII.HHZ. 2023-02-17T14:46:28.77 0.6 undecidable manual S 332 61.1943 50 -0.51 56
IV.BDI.HNZ. 2023-02-17T14:46:26.72 0.3 undecidable manual P 346 94.5387 50 0.52 79
GU.POPM.HHZ. 2023-02-17T14:46:26.28 0.3 undecidable manual P 353 90.243 50 0.75 73
IV.CASP.HHZ. 2023-02-17T14:46:25.26 0.3 undecidable manual S 182 49.5171 50 -0.89 74
IV.CAFI.HHZ. 2023-02-17T14:46:25.68 0.3 undecidable manual P 83 87.7455 50 0.54 80
IV.OSSC.HHZ. 2023-02-17T14:46:24.12 0.3 undecidable manual S 42 43.0236 50 -0.29 92
IV.CELB.HHZ. 2023-02-17T14:46:23.92 0.3 positive manual P 226 77.2671 50 0.39 84
IV.ARCI.HHZ. 2023-02-17T14:46:21.80 0.3 undecidable manual P 132 63.9915 50 0.31 88
IV.PII.HHZ. 2023-02-17T14:46:21.02 0.3 undecidable manual P 332 61.1943 50 -0.04 94
IV.CRMI.HHZ. 2023-02-17T14:46:21.17 0.3 undecidable manual P 7 62.3931 50 -0.07 93
IV.MALA4.EHZ. 2023-02-17T14:46:20.20 0.6 undecidable manual P 118 54.2013 50 0.22 61
IV.MALA0.EHN. 2023-02-17T14:46:20.22 0.3 undecidable manual P 118 54.0015 50 0.28 90
IV.CASP.HHZ. 2023-02-17T14:46:19.16 0.3 undecidable manual P 182 49.5171 50 -0.09 95
IV.OSSC.HHZ. 2023-02-17T14:46:17.92 0.3 undecidable manual P 42 43.0236 50 -0.33 91
IV.FROS.CHZ. 2023-02-17T14:46:17.79 0.3 undecidable manual S 98 21.9669 110 -0.16 98
IV.TRIF.CHZ. 2023-02-17T14:46:15.45 0.3 undecidable manual S 175 13.5753 121 0.13 100
IV.FROS.CHZ. 2023-02-17T14:46:14.18 0.3 undecidable manual P 98 21.9669 110 -0.33 95
IV.TRIF.CHZ. 2023-02-17T14:46:12.61 0.3 undecidable manual P 175 13.5753 121 -0.39 95
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.TRIF.CHN. ML:2.2 0.0016 0.2 AML other m 2023-02-17T14:46:15.24
IV.TRIF.CHE. ML:2.2 0.001665 0.72 AML other m 2023-02-17T14:46:15.69
IV.FROS.CHE. ML:1.8 0.000537 1.6 AML other m 2023-02-17T14:46:20.83
IV.FROS.CHN. ML:1.8 0.0005145 0.16 AML other m 2023-02-17T14:46:20.20
IV.OSSC.HHN. ML:1.6 0.00011800000000000001 0.38 AML other m 2023-02-17T14:46:24.62
IV.OSSC.HHE. ML:1.4 0.00007255 1.04 AML other m 2023-02-17T14:46:24.10
IV.CASP.HHN. ML:1.4 0.00006275 0.44 AML other m 2023-02-17T14:46:25.55
IV.CASP.HHE. ML:1.3 0.0000551 0.58 AML other m 2023-02-17T14:46:26.08
IV.PII.HHN. ML:1.7 0.000106 0.36 AML other m 2023-02-17T14:46:29.29
IV.PII.HHE. ML:1.5 0.00006485 1.72 AML other m 2023-02-17T14:46:30.99
IV.CRMI.HHE. ML:0.9 0.0000167 0.48 AML other m 2023-02-17T14:46:30.81
IV.ARCI.HHN. ML:1.5 0.00005465000000000001 0.96 AML other m 2023-02-17T14:46:30.20
IV.ARCI.HHE. ML:1.5 0.00006355 0.3 AML other m 2023-02-17T14:46:30.88
IV.CRMI.HHN. ML:1.1 0.00002395 1.02 AML other m 2023-02-17T14:46:32.86
IV.CELB.HHN. ML:1.6 0.000056349999999999994 0.48 AML other m 2023-02-17T14:46:33.25
IV.CELB.HHE. ML:1.8 0.00008360000000000001 0.6 AML other m 2023-02-17T14:46:36.59
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