Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.9 on date 23-02-2021 and time 13:15:17 (Italy) in region 3 km E Castelnuovo di Val di Cecina (PI)

A magnitude ML 1.9 earthquake occured in region: 3 km E Castelnuovo di Val di Cecina (PI), on

  • 23-02-2021 12:15:17 (UTC)
  • 23-02-2021 13:15:17 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.2180, 10.9440 at 7 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 3 2231 2231
Radicondoli SI 9 914 3145
Monterotondo Marittimo GR 11 1371 4516
Pomarance PI 11 5897 10413
Montieri GR 11 1204 11617
Chiusdino SI 14 1903 13520
Casole d'Elsa SI 16 3897 17417
Monteverdi Marittimo PI 19 758 18175
Massa Marittima GR 19 8375 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)
63 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 1.9 2021-02-23
12:15:17		 43.2183 10.9443 7 2021-07-12
16:55:00		 Bollettino Sismico Italiano INGV 87600621
Reviewed
Rev100 		ML 1.9 2021-02-23
12:15:17		 43.2143 10.941 7 2021-02-23
12:27:03		 Sala Sismica INGV-Roma 87408591
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-02-23 12:15:17 ± 0.1
Latitude 43.2183 ± 0.0063
Longitude 10.9443 ± 0.0086
Depth (km) 7 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 87600621

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 636
Semi-minor axis of confidence ellipse (meter) 615
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 95
Circular confidence region, given by single value of horizontal uncertainty (meter) 640.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 56
Number of associated phases, regardless of their use for origin computation 39
Number of defining phases 30
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.37
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 1.10617
Number of stations at which the event was observed 32
Number of stations from which data was used for origin computation 23
Magnitudes information

ML:1.9

Field Value
Value 1.9
Uncertainty 0.3
Num. used stations 30
Type of magnitude ML
Reference to an origin 87600621
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-04-19 17:47:57

ML:1.9

Field Value
Value 1.9
Uncertainty 0.3
Num. used stations 30
Type of magnitude ML
Reference to an origin 87408591
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-02-23 12:27:03
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MRLC.HHZ. 2021-02-23T12:17:09.89 3.0 undecidable manual Sn -2.77 0
MN.TRI.HHZ. 2021-02-23T12:16:51.94 3.0 undecidable manual Sn 4.34 0
IV.SPS2.HHZ. 2021-02-23T12:16:41.62 3.0 undecidable manual Pn -0.59 0
IV.USI.HHZ. 2021-02-23T12:16:28.11 3.0 negative manual Pn -2.69 0
SL.BOJS.BHZ. 2021-02-23T12:16:24.07 3.0 negative manual Pn 7.27 0
IV.SARZ.HHZ. 2021-02-23T12:16:23.94 3.0 undecidable manual Sn 0.69 0
IV.MNTP.HNZ. 2021-02-23T12:16:22.28 3.0 undecidable manual Sg 7.2 0
IV.MTMR.EHZ. 2021-02-23T12:16:21.84 3.0 negative manual Pn 5.15 0
IV.MTRA.EHZ. 2021-02-23T12:15:51.00 3.0 undecidable manual Pn 1.08 0
GU.EQUI.HHZ. 2021-02-23T12:15:38.47 0.6 undecidable manual P 329 122.7882 50 0.45 38
IV.PII.HHZ. 2021-02-23T12:15:37.13 0.6 undecidable manual S 329 65.2902 50 -0.8 37
IV.LMD.HHZ. 2021-02-23T12:15:37.22 0.3 undecidable manual P 32 113.2977 50 0.67 54
IV.ARCI.HHZ. 2021-02-23T12:15:35.78 0.6 undecidable manual S 133 59.1963 50 -0.53 42
IV.SFI.EHZ. 2021-02-23T12:15:35.68 0.3 undecidable manual P 43 105.2169 50 0.38 60
IV.BDI.HHZ. 2021-02-23T12:15:34.21 0.3 undecidable manual P 343 97.7244 50 0.05 65
IV.SEI.HHZ. 2021-02-23T12:15:34.76 0.3 undecidable manual P 20 98.5236 50 0.49 59
IV.CRE.HHZ. 2021-02-23T12:15:34.10 0.3 undecidable manual P 61 92.5407 50 0.75 54
IV.RONT.HHZ. 2021-02-23T12:15:34.48 0.3 undecidable manual P 24 94.5387 50 0.82 52
GU.POPM.HHZ. 2021-02-23T12:15:33.42 0.6 undecidable manual P 351 92.9403 50 0.01 44
IV.RINC.HHZ. 2021-02-23T12:15:33.63 0.3 undecidable manual P 35 91.242 50 0.47 60
IV.MOCL.EHZ. 2021-02-23T12:15:32.92 0.6 undecidable manual P 12 89.244 50 0.07 44
IV.CELB.HHN. 2021-02-23T12:15:32.03 0.6 undecidable manual P 229 79.2651 50 0.72 37
GU.MAIM.HHZ. 2021-02-23T12:15:32.18 0.3 undecidable manual P 335 85.248 50 -0.04 67
IV.MPPT.EHZ. 2021-02-23T12:15:31.74 0.1 undecidable manual P 8 82.8504 50 -0.12 88
IV.RUFI.EHZ. 2021-02-23T12:15:31.69 0.3 undecidable manual P 33 82.3509 50 -0.1 66
TV.SF04.EHZ. 2021-02-23T12:15:30.29 0.3 undecidable manual P 126 71.9724 50 0.11 67
IV.CSNT.HHZ. 2021-02-23T12:15:29.60 0.3 undecidable manual S 45 39.7269 50 -1.5 41
IV.PII.HHZ. 2021-02-23T12:15:29.04 0.1 undecidable manual P 329 65.2902 50 -0.11 91
IV.ARCI.HHZ. 2021-02-23T12:15:28.43 0.6 undecidable manual P 133 59.1963 50 0.21 45
IV.RIBO.EHZ.01 2021-02-23T12:15:27.85 0.3 undecidable manual S 164 31.0467 103 -0.35 69
IV.CASP.HHZ. 2021-02-23T12:15:26.24 0.1 undecidable manual P 188 47.8188 50 -0.23 92
IV.MAGO.CHZ. 2021-02-23T12:15:25.28 0.3 undecidable manual S 285 23.9538 107 -0.54 67
IV.CSNT.HHZ. 2021-02-23T12:15:24.60 0.1 undecidable manual P 45 39.7269 50 -0.61 84
IV.RIBO.EHZ.01 2021-02-23T12:15:23.44 0.1 undecidable manual P 164 31.0467 103 -0.09 97
IV.FROS.CHZ. 2021-02-23T12:15:23.25 0.3 undecidable manual S 93 17.1717 112 -0.35 71
IV.TRIF.CHZ. 2021-02-23T12:15:22.15 0.3 undecidable manual S 196 11.9769 121 0.16 74
IV.MAGO.CHZ. 2021-02-23T12:15:22.08 0.1 undecidable manual P 285 23.9538 107 -0.08 99
IV.TRIF.CHZ. 2021-02-23T12:15:20.26 0.1 undecidable manual P 196 11.9769 121 0.31 96
IV.FROS.CHZ. 2021-02-23T12:15:20.96 0.1 undecidable manual P 93 17.1717 112 0.08 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.TRIF.CHN. ML:2.5 0.00423 0.8 AML other m 2021-02-23T12:15:22.07
IV.TRIF.CHE. ML:2.5 0.004314999999999999 0.98 AML other m 2021-02-23T12:15:22.32
IV.MAGO.CHN. ML:2.6 0.002485 0.24 AML other m 2021-02-23T12:15:25.46
IV.MAGO.CHE. ML:2.5 0.0022800000000000003 0.1 AML other m 2021-02-23T12:15:25.65
IV.FROS.CHE. ML:2.0 0.0009099999999999999 0.32 AML other m 2021-02-23T12:15:25.74
IV.FROS.CHN. ML:2.1 0.00122 0.48 AML other m 2021-02-23T12:15:26.27
IV.CSNT.HHN. ML:1.9 0.00029099999999999997 0.38 AML other m 2021-02-23T12:15:30.78
IV.CSNT.HHE. ML:1.8 0.00022999999999999998 1.26 AML other m 2021-02-23T12:15:30.27
IV.ARCI.HHE. ML:1.8 0.00012365 1.52 AML other m 2021-02-23T12:15:36.84
IV.CASP.HHE. ML:1.9 0.000231 0.2 AML other m 2021-02-23T12:15:37.13
IV.CASP.HHN. ML:1.6 0.0001235 0.92 AML other m 2021-02-23T12:15:37.91
IV.PII.HHN. ML:2.2 0.0002585 1.04 AML other m 2021-02-23T12:15:38.32
IV.PII.HHE. ML:2.2 0.0002755 1.76 AML other m 2021-02-23T12:15:38.95
IV.ARCI.HHN. ML:1.6 0.0000733 0.24 AML other m 2021-02-23T12:15:40.26
IV.MPPT.EHE. ML:1.6 0.000050549999999999995 1.24 AML other m 2021-02-23T12:15:45.71
IV.MPPT.EHN. ML:1.4 0.000034450000000000004 1.36 AML other m 2021-02-23T12:15:45.74
IV.RINC.HHE. ML:1.8 0.0000779 0.46 AML other m 2021-02-23T12:15:46.32
IV.BDI.HHN. ML:1.6 0.000039349999999999994 0.92 AML other m 2021-02-23T12:15:48.50
IV.RINC.HHN. ML:1.9 0.0000853 0.66 AML other m 2021-02-23T12:15:49.98
IV.RONT.HHE. ML:2.2 0.000188 0.34 AML other m 2021-02-23T12:15:50.50
IV.RONT.HHN. ML:2.3 0.00022849999999999997 1.48 AML other m 2021-02-23T12:15:50.99
IV.BDI.HHE. ML:1.6 0.000040300000000000004 1 AML other m 2021-02-23T12:15:51.54
IV.CRE.HHN. ML:1.6 0.00004795 0.52 AML other m 2021-02-23T12:15:51.47
IV.SEI.HHE. ML:2.0 0.00011599999999999999 0.4 AML other m 2021-02-23T12:15:52.62
IV.CRE.HHE. ML:1.5 0.00003465 0.7 AML other m 2021-02-23T12:15:52.82
IV.SEI.HHN. ML:2.2 0.000157 1.62 AML other m 2021-02-23T12:15:53.87
IV.LMD.HHE. ML:1.6 0.00003145 0.6 AML other m 2021-02-23T12:15:54.66
IV.SFI.EHE. ML:1.6 0.00004149999999999999 0.62 AML other m 2021-02-23T12:15:54.42
IV.LMD.HHN. ML:1.7 0.000043349999999999997 1.16 AML other m 2021-02-23T12:15:54.87
IV.SFI.EHN. ML:1.5 0.00003195 0.52 AML other m 2021-02-23T12:15:54.97
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