Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.3 on date 24-07-2021 and time 20:40:40 (Italy) in region 6 km NW Castelnuovo di Val di Cecina (PI)

A magnitude ML 2.3 earthquake occured in region: 6 km NW Castelnuovo di Val di Cecina (PI), on

  • 24-07-2021 18:40:40 (UTC)
  • 24-07-2021 20:40:40 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.2500, 10.8670 at 9 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 6 2231 2231
Pomarance PI 6 5897 8128
Monterotondo Marittimo GR 12 1371 9499
Radicondoli SI 14 914 10413
Monteverdi Marittimo PI 15 758 11171
Volterra PI 17 10519 21690
Casole d'Elsa SI 18 3897 25587
Montieri GR 18 1204 26791
Montecatini Val di Cecina PI 19 1749 28540

Municipalities with at least 50000 inhabitants

An earthquake occurred to
39 Km W of Siena (53903 inhabitants)
56 Km SE of Livorno (159219 inhabitants)
58 Km NW of Grosseto (82087 inhabitants)
62 Km SW of Scandicci (50609 inhabitants)
64 Km SE of Pisa (89158 inhabitants)
66 Km SW of Firenze (382808 inhabitants)
72 Km SE of Lucca (89046 inhabitants)
73 Km S of Prato (191150 inhabitants)
76 Km S of Pistoia (90315 inhabitants)
85 Km SE of Viareggio (62467 inhabitants)
86 Km W of Arezzo (99543 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 2.3 2021-07-24
18:40:40		 43.2497 10.8667 9 2021-12-29
11:12:16		 Bollettino Sismico Italiano INGV 93389911
Reviewed
Rev100 		ML 2.3 2021-07-24
18:40:40		 43.2498 10.8608 9 2021-07-24
18:48:27		 Sala Sismica INGV-Roma 93164611
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-07-24 18:40:40 ± 0.04
Latitude 43.2497 ± 0.0027
Longitude 10.8667 ± 0.0037
Depth (km) 9 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 93389911

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 285
Semi-minor axis of confidence ellipse (meter) 230
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 205
Circular confidence region, given by single value of horizontal uncertainty (meter) 280.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 55
Number of associated phases, regardless of their use for origin computation 40
Number of defining phases 40
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.15
Epicentral distance of station closest to the epicenter (degree) 0.13760
Epicentral distance of station farthest from the epicenter (degree) 0.87954
Number of stations at which the event was observed 28
Number of stations from which data was used for origin computation 28
Magnitudes information

ML:2.3

Field Value
Value 2.3
Uncertainty 0.3
Num. used stations 43
Type of magnitude ML
Reference to an origin 93389911
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-07-30 09:24:09

ML:2.3

Field Value
Value 2.3
Uncertainty 0.3
Num. used stations 57
Type of magnitude ML
Reference to an origin 93164611
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-07-24 18:48:27
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CELB.HHZ. 2021-07-24T18:41:03.39 0.6 undecidable manual S 224 77.1672 50 -0.17 1
IV.CRMI.HHZ. 2021-07-24T18:40:59.56 0.3 undecidable manual S 8 61.2942 50 0.24 49
IV.PII.HHZ. 2021-07-24T18:40:58.40 0.3 undecidable manual S 332 59.1963 50 -0.37 55
VR.VRG03.HH1. 2021-07-24T18:40:57.34 0.6 undecidable manual S 324 53.9016 50 -0.01 48
IV.ASQU.HHZ. 2021-07-24T18:40:57.24 0.1 undecidable manual P 50 95.8263 50 0.74 0
VR.VRG01.HH2. 2021-07-24T18:40:57.03 0.6 undecidable manual S 326 51.4152 50 0.33 47
IV.CRE.HHZ. 2021-07-24T18:40:57.45 0.6 undecidable manual P 65 96.5256 50 0.85 0
IV.SEI.HHZ. 2021-07-24T18:40:57.38 0.1 undecidable manual P 24 97.6245 50 0.62 0
IV.CAFI.HHZ. 2021-07-24T18:40:56.03 0.3 undecidable manual P 84 89.244 50 0.55 0
IV.BDI.HHZ. 2021-07-24T18:40:56.38 0.1 positive manual P 347 92.8404 50 0.36 0
VR.VRG02.HH2. 2021-07-24T18:40:56.97 1.0 undecidable manual S 328 53.2023 50 -0.22 23
GU.POPM.HHZ. 2021-07-24T18:40:55.88 0.1 positive manual P 354 88.6446 50 0.49 0
IV.BOSL.HHZ. 2021-07-24T18:40:55.41 0.1 undecidable manual P 28 85.8474 50 0.44 0
TV.SF14.HHN. 2021-07-24T18:40:55.03 0.1 undecidable manual P 132 81.7515 50 0.7 0
IV.MOCL.EHZ. 2021-07-24T18:40:55.55 0.1 undecidable manual P 17 87.5457 50 0.34 0
TV.SF04.EHZ. 2021-07-24T18:40:54.62 0.1 undecidable manual P 125 79.0653 50 0.71 0
IV.MPPT.EHZ. 2021-07-24T18:40:54.44 0.1 undecidable manual P 13 80.5638 50 0.3 0
IV.CELB.HHZ. 2021-07-24T18:40:54.18 0.6 undecidable manual P 224 77.1672 50 0.57 1
IV.RUFI.EHZ. 2021-07-24T18:40:54.99 0.1 positive manual P 38 83.25 50 0.44 0
IV.OSSC.HHZ. 2021-07-24T18:40:54.02 0.6 undecidable manual S 45 43.1235 50 -0.45 46
GU.MAIM.HHZ. 2021-07-24T18:40:54.45 0.1 undecidable manual P 338 79.5648 50 0.47 0
IV.CSNT.HHZ. 2021-07-24T18:40:53.90 0.6 undecidable manual S 54 42.2244 50 -0.34 47
TV.SF01.EHZ. 2021-07-24T18:40:53.35 1.0 undecidable manual P 130 74.4699 50 0.15 2
IV.RIBO.EHZ. 2021-07-24T18:40:52.46 0.6 undecidable manual S 156 36.4413 50 -0.22 48
IV.ARCI.HHZ. 2021-07-24T18:40:52.42 0.6 undecidable manual P 132 66.1893 50 0.5 20
IV.CRMI.HHZ. 2021-07-24T18:40:51.45 0.1 positive manual P 8 61.2942 50 0.29 65
VR.VRG02.HH2. 2021-07-24T18:40:50.22 0.3 undecidable manual P 328 53.2023 50 0.29 69
VR.VRG03.HH1. 2021-07-24T18:40:50.18 0.3 undecidable manual P 324 53.9016 50 0.15 70
IV.PII.HHZ. 2021-07-24T18:40:50.87 0.1 positive manual P 332 59.1963 50 0.02 78
IV.CASP.HHZ. 2021-07-24T18:40:49.55 0.1 undecidable manual P 180 50.9157 50 -0.02 100
VR.VRG01.HH2. 2021-07-24T18:40:49.71 0.1 positive manual P 326 51.4152 50 0.06 99
IV.OSSC.HHZ. 2021-07-24T18:40:48.40 0.1 positive manual P 45 43.1235 50 0.03 100
IV.FROS.CHZ. 2021-07-24T18:40:48.81 0.3 undecidable manual S 101 23.8539 110 -0.03 75
IV.CSNT.HHZ. 2021-07-24T18:40:48.14 0.1 positive manual P 54 42.2244 50 -0.09 99
IV.RIBO.EHZ. 2021-07-24T18:40:47.28 0.1 undecidable manual P 156 36.4413 50 -0.05 100
IV.TRIF.CHZ. 2021-07-24T18:40:46.11 0.3 undecidable manual S 169 15.2736 120 -0.03 75
IV.MAGO.CHZ. 2021-07-24T18:40:46.16 0.3 undecidable manual S 279 17.0718 117 -0.54 67
IV.FROS.CHZ. 2021-07-24T18:40:45.16 0.1 positive manual P 101 23.8539 110 0.04 100
IV.TRIF.CHZ. 2021-07-24T18:40:43.75 0.1 positive manual P 169 15.2736 120 0.19 97
IV.MAGO.CHZ. 2021-07-24T18:40:43.98 0.1 positive manual P 279 17.0718 117 0.1 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MAGO.CHE. ML:3.1 0.0114246475 0.1664 AML other m 2021-07-24T18:40:46.25
IV.MAGO.CHN. ML:3.2 0.013952515 0.1024 AML other m 2021-07-24T18:40:46.30
IV.TRIF.CHN. ML:3.0 0.010986415000000001 0.192 AML other m 2021-07-24T18:40:46.30
IV.TRIF.CHE. ML:3.3 0.01949303 0.192 AML other m 2021-07-24T18:40:47.30
IV.FROS.CHN. ML:2.6 0.0023546895000000003 0.1024 AML other m 2021-07-24T18:40:49.02
IV.FROS.CHE. ML:2.6 0.002320318 0.9984 AML other m 2021-07-24T18:40:49.44
IV.RIBO.EHE.01 ML:2.4 0.00113801435 0.1792 AML other m 2021-07-24T18:40:53.65
IV.CSNT.HHN. ML:2.4 0.0008634999999999999 0.2 AML other m 2021-07-24T18:40:53.48
IV.CSNT.HHE. ML:2.4 0.0007752934000000001 0.1792 AML other m 2021-07-24T18:40:53.95
IV.OSSC.HHE. ML:2.4 0.0008029812999999999 0.2432 AML other m 2021-07-24T18:40:54.58
IV.CASP.HHN. ML:2.1 0.00029411739999999996 0.1792 AML other m 2021-07-24T18:40:57.01
IV.OSSC.HHN. ML:2.3 0.0006835 0.32 AML other m 2021-07-24T18:40:57.48
IV.CASP.HNN. ML:2.2 0.00043904299999999996 0.32 AML other m 2021-07-24T18:40:57.00
IV.PII.HHN. ML:2.8 0.0013250000000000002 0.26 AML other m 2021-07-24T18:40:58.72
IV.PII.HHE. ML:2.7 0.0011235679 0.2176 AML other m 2021-07-24T18:40:58.52
IV.CRMI.HHE. ML:1.9 0.00016399085 0.384 AML other m 2021-07-24T18:40:59.64
IV.CRMI.HHN. ML:2.0 0.00021191425 0.2304 AML other m 2021-07-24T18:41:00.99
IV.MPPT.EHN. ML:2.0 0.00014500000000000003 0.26 AML other m 2021-07-24T18:41:01.66
IV.ARCI.HNE. ML:2.2 0.0002634478 0.192 AML other m 2021-07-24T18:41:01.69
IV.ARCI.HHE. ML:2.2 0.00027800000000000004 0.2 AML other m 2021-07-24T18:41:01.69
IV.ARCI.HNN. ML:2.1 0.000222082635 0.2048 AML other m 2021-07-24T18:41:02.57
IV.ARCI.HHN. ML:2.1 0.00024350830000000002 0.3712 AML other m 2021-07-24T18:41:03.82
TV.SF01.EHN. ML:2.4 0.00036469785 0.2432 AML other m 2021-07-24T18:41:04.30
GU.MAIM.HHE. ML:2.2 0.000235 0.32 AML other m 2021-07-24T18:41:04.24
GU.MAIM.HHN. ML:2.3 0.000259632 0.3584 AML other m 2021-07-24T18:41:04.44
IV.RUFI.EHE. ML:2.1 0.0001587849 0.32 AML other m 2021-07-24T18:41:05.21
TV.SF01.EHE. ML:2.5 0.0005110000000000001 0.44 AML other m 2021-07-24T18:41:05.81
IV.MPPT.EHE. ML:1.9 0.000118248295 0.192 AML other m 2021-07-24T18:41:06.83
GU.POPM.HHN. ML:2.6 0.0004477077 0.2048 AML other m 2021-07-24T18:41:08.83
GU.POPM.HHE. ML:2.5 0.00039880075 0.384 AML other m 2021-07-24T18:41:09.56
IV.RUFI.EHN. ML:2.0 0.0001417158 0.7168 AML other m 2021-07-24T18:41:09.98
IV.BDI.HNE. ML:2.3 0.00020763925 0.2944 AML other m 2021-07-24T18:41:09.63
IV.CAFI.HHE. ML:1.7 0.000055395514999999996 0.3584 AML other m 2021-07-24T18:41:10.00
IV.ASQU.HHE. ML:2.4 0.0002355 0.34 AML other m 2021-07-24T18:41:10.41
IV.BDI.HHE. ML:2.2 0.00019350000000000001 0.2 AML other m 2021-07-24T18:41:11.18
IV.BDI.HNN. ML:2.3 0.0002055137 0.512 AML other m 2021-07-24T18:41:12.99
IV.BDI.HHN. ML:2.2 0.00016817025 0.4096 AML other m 2021-07-24T18:41:13.00
IV.CRE.HHN. ML:2.2 0.00014947179999999998 0.3456 AML other m 2021-07-24T18:41:13.27
IV.SEI.HHN. ML:2.6 0.000437 0.42 AML other m 2021-07-24T18:41:13.28
IV.CAFI.HHN. ML:1.7 0.00006104999999999999 0.68 AML other m 2021-07-24T18:41:13.61
IV.SEI.HHE. ML:2.5 0.00035099999999999997 1.58 AML other m 2021-07-24T18:41:13.98
IV.ASQU.HHN. ML:2.0 0.00009971984 0.3584 AML other m 2021-07-24T18:41:14.90
IV.CRE.HHE. ML:2.0 0.0001175 1.38 AML other m 2021-07-24T18:41:15.26
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
Waveforms Seismic signals in miniseed + resp format Download