Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 25-10-2021 and time 21:49:03 (Italy) in region 4 km E Castelnuovo di Val di Cecina (PI)

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

  • 25-10-2021 19:49:03 (UTC)
  • 25-10-2021 21:49:03 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.2190, 10.9470 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
Radicondoli SI 9 914 3145
Pomarance PI 11 5897 9042
Monterotondo Marittimo GR 11 1371 10413
Montieri GR 11 1204 11617
Chiusdino SI 14 1903 13520
Casole d'Elsa SI 16 3897 17417
Massa Marittima GR 19 8375 25792
Monteverdi Marittimo PI 19 758 26550

Municipalities with at least 50000 inhabitants

An earthquake occurred to
33 Km W of Siena (53903 inhabitants)
53 Km N of Grosseto (82087 inhabitants)
63 Km SW of Scandicci (50609 inhabitants)
64 Km SE of Livorno (159219 inhabitants)
66 Km SW of Firenze (382808 inhabitants)
71 Km SE of Pisa (89158 inhabitants)
75 Km S of Prato (191150 inhabitants)
78 Km SE of Lucca (89046 inhabitants)
80 Km S of Pistoia (90315 inhabitants)
81 Km W of Arezzo (99543 inhabitants)
91 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 2021-10-25
19:49:03		 43.2192 10.9473 8 2022-03-30
13:04:14		 Bollettino Sismico Italiano INGV 97168451
Reviewed
Rev100 		ML 1.7 2021-10-25
19:49:03		 43.2203 10.9485 8 2021-10-25
20:03:05		 Sala Sismica INGV-Roma 96987781
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-25 19:49:03 ± 0.08
Latitude 43.2192 ± 0.0045
Longitude 10.9473 ± 0.0062
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 97168451

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 530
Semi-minor axis of confidence ellipse (meter) 408
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 274
Circular confidence region, given by single value of horizontal uncertainty (meter) 530.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 72
Number of associated phases, regardless of their use for origin computation 41
Number of defining phases 26
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.29
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.83727
Number of stations at which the event was observed 28
Number of stations from which data was used for origin computation 14
Magnitudes information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations 20
Type of magnitude ML
Reference to an origin 96987781
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-25 20:03:05

ML:1.6

Field Value
Value 1.6
Uncertainty 0.1
Num. used stations 14
Type of magnitude ML
Reference to an origin 97168451
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-11-02 13:27:01
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MPNC.HHZ. 2021-10-25T19:50:55.95 3.0 negative manual Pg 21.58 0
IV.PAOL.HHZ. 2021-10-25T19:50:55.86 3.0 undecidable manual Sg 14.81 0
OT.OT17.EHZ. 2021-10-25T19:50:45.04 3.0 undecidable manual Sn 0.57 0
IV.COLB.HHZ. 2021-10-25T19:50:42.43 3.0 undecidable manual Sn 3.46 0
MN.TRI.HHZ. 2021-10-25T19:50:33.26 3.0 undecidable manual Sn -0.47 0
OX.VARN.HHZ. 2021-10-25T19:50:32.27 3.0 undecidable manual Sg 6.23 0
IV.MDI.HHZ. 2021-10-25T19:50:25.49 3.0 undecidable manual Sg 4.22 0
GU.MGRO.HHZ. 2021-10-25T19:50:15.18 3.0 undecidable manual Sn 0.28 0
IV.PZUN.HHZ. 2021-10-25T19:50:10.64 3.0 negative manual Pn -1.28 0
IV.TREM.HHZ. 2021-10-25T19:50:07.86 3.0 negative manual Pg 8.47 0
IV.PAOL.HHZ. 2021-10-25T19:50:03.19 3.0 positive manual Pn 4.66 0
IV.TREG.EHZ. 2021-10-25T19:49:42.62 3.0 negative manual Pn 0.56 0
IV.BOZZ.EHZ. 2021-10-25T19:49:38.03 3.0 positive manual Pn 1.34 0
GU.POPM.HHZ. 2021-10-25T19:49:32.25 0.3 undecidable manual S 351 92.9403 50 0.37 62
IV.MPPT.EHZ. 2021-10-25T19:49:29.36 0.6 undecidable manual S 8 82.7505 50 0.19 44
IV.RUFI.EHZ. 2021-10-25T19:49:29.39 0.6 undecidable manual S 33 82.251 50 0.36 43
IV.PII.HHZ. 2021-10-25T19:49:24.41 0.3 undecidable manual S 329 65.2902 50 -0.12 69
IV.PARC.HHZ. 2021-10-25T19:49:24.41 3.0 negative manual P -0.15 0
IV.CRMI.HHZ. 2021-10-25T19:49:23.73 0.6 undecidable manual S 2 63.9915 50 -0.45 43
IV.CRE.HHZ. 2021-10-25T19:49:21.12 3.0 negative manual P 0.3 0
GU.POPM.HHZ. 2021-10-25T19:49:20.48 0.3 undecidable manual P 351 92.9403 50 0.4 62
IV.CASP.HHZ. 2021-10-25T19:49:19.39 0.3 undecidable manual S 188 48.0186 50 -0.5 66
GU.MAIM.HHZ. 2021-10-25T19:49:19.15 0.3 undecidable manual P 335 85.248 50 0.25 65
IV.RUFI.EHZ. 2021-10-25T19:49:18.71 0.1 undecidable manual P 33 82.251 50 0.28 86
IV.MPPT.EHZ. 2021-10-25T19:49:18.77 0.1 undecidable manual P 8 82.7505 50 0.27 87
IV.CELB.HHZ. 2021-10-25T19:49:18.84 0.3 undecidable manual P 229 79.4649 50 0.83 54
IV.CSNT.HHZ. 2021-10-25T19:49:17.10 0.3 undecidable manual S 44 39.5271 50 -0.53 66
IV.OSSC.HHZ. 2021-10-25T19:49:17.77 0.6 undecidable manual S 35 41.4252 50 -0.39 46
IV.PII.HHZ. 2021-10-25T19:49:15.68 0.1 undecidable manual P 329 65.2902 50 -0.15 92
IV.CRMI.HHZ. 2021-10-25T19:49:15.67 0.3 positive manual P 2 63.9915 50 0.05 70
IV.RIBO.EHZ.01 2021-10-25T19:49:14.81 0.3 undecidable manual S 165 31.0467 104 -0.23 72
IV.CASP.HHZ. 2021-10-25T19:49:13.24 0.1 undecidable manual P 188 48.0186 50 0.09 96
IV.MAGO.CHZ. 2021-10-25T19:49:12.16 0.3 undecidable manual S 285 24.1536 108 -0.6 66
IV.CSNT.HHZ. 2021-10-25T19:49:11.52 0.1 undecidable manual P 44 39.5271 50 -0.32 93
IV.OSSC.HHZ. 2021-10-25T19:49:11.96 0.3 undecidable manual P 35 41.4252 50 -0.19 71
IV.RIBO.EHZ.01 2021-10-25T19:49:10.54 0.3 undecidable manual P 165 31.0467 104 0.19 73
IV.FROS.CHZ. 2021-10-25T19:49:10.29 0.3 undecidable manual S 93 16.872 115 -0.13 75
IV.MAGO.CHZ. 2021-10-25T19:49:08.94 0.1 undecidable manual P 285 24.1536 108 -0.09 100
IV.TRIF.CHZ. 2021-10-25T19:49:08.83 0.3 undecidable manual S 197 12.0768 123 -0.14 76
IV.TRIF.CHZ. 2021-10-25T19:49:07.19 0.1 undecidable manual P 197 12.0768 123 0.35 97
IV.FROS.CHZ. 2021-10-25T19:49:07.89 0.1 undecidable manual P 93 16.872 115 0.21 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FROS.CHE. ML:1.7 0.00042581745000000004 0.2688 AML other m 2021-10-25T19:49:10.41
IV.FROS.CHN. ML:1.8 0.0005837386499999999 0.2304 AML other m 2021-10-25T19:49:12.79
IV.CSNT.HHN. ML:1.4 0.00010164999999999999 0.38 AML other m 2021-10-25T19:49:17.01
IV.CSNT.HHE. ML:1.6 0.0001235 0.52 AML other m 2021-10-25T19:49:17.58
IV.OSSC.HHN. ML:1.7 0.000163 0.28 AML other m 2021-10-25T19:49:18.02
IV.OSSC.HHE. ML:1.7 0.000174 0.18 AML other m 2021-10-25T19:49:18.53
IV.CASP.HHN. ML:1.4 0.00006769999999999999 0.12 AML other m 2021-10-25T19:49:19.62
IV.CASP.HHE. ML:1.8 0.00015900000000000002 0.18 AML other m 2021-10-25T19:49:24.04
IV.PII.HHE. ML:1.7 0.00009045 0.32 AML other m 2021-10-25T19:49:25.77
IV.PII.HHN. ML:1.7 0.00008795 0.3 AML other m 2021-10-25T19:49:26.54
IV.CELB.HHN. ML:1.8 0.00007885 1.54 AML other m 2021-10-25T19:49:33.09
IV.CELB.HHE. ML:1.7 0.00006484999999999999 0.8 AML other m 2021-10-25T19:49:34.56
GU.POPM.HHE. ML:1.5 0.00003315 0.78 AML other m 2021-10-25T19:49:34.54
GU.POPM.HHN. ML:1.6 0.00004965 0.74 AML other m 2021-10-25T19:49:34.58
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