Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.2 on date 19-10-2021 and time 04:21:52 (Italy) in region 6 km E Castelnuovo di Val di Cecina (PI)

A magnitude ML 1.2 earthquake occured in region: 6 km E Castelnuovo di Val di Cecina (PI), on

  • 19-10-2021 02:21:52 (UTC)
  • 19-10-2021 04:21:52 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.1900, 10.9790 at 11 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.

Hai sentito il terremoto? Clicca qui

Did you feel it? Fill in the questionnaire.

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
Montieri GR 7 1204 3435
Radicondoli SI 10 914 4349
Chiusdino SI 10 1903 6252
Monterotondo Marittimo GR 11 1371 7623
Pomarance PI 15 5897 13520
Massa Marittima GR 17 8375 21895
Monticiano SI 17 1571 23466
Casole d'Elsa SI 18 3897 27363

Municipalities with at least 50000 inhabitants

An earthquake occurred to
32 Km W of Siena (53903 inhabitants)
49 Km N of Grosseto (82087 inhabitants)
65 Km S of Scandicci (50609 inhabitants)
68 Km SE of Livorno (159219 inhabitants)
68 Km SW of Firenze (382808 inhabitants)
75 Km SE of Pisa (89158 inhabitants)
77 Km S of Prato (191150 inhabitants)
79 Km W of Arezzo (99543 inhabitants)
82 Km SE of Lucca (89046 inhabitants)
83 Km S of Pistoia (90315 inhabitants)
96 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 1.2 2021-10-19
02:21:52		 43.1905 10.9788 11 2022-03-30
13:04:13		 Bollettino Sismico Italiano INGV 97019181
Reviewed
Rev100 		ML 1.0 2021-10-19
02:21:52		 43.2043 10.9848 9 2021-10-19
02:54:21		 Sala Sismica INGV-Roma 96746281
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-19 02:21:52 ± 0.08
Latitude 43.1905 ± 0.0045
Longitude 10.9788 ± 0.0062
Depth (km) 11 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 97019181

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 567
Semi-minor axis of confidence ellipse (meter) 359
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 135
Circular confidence region, given by single value of horizontal uncertainty (meter) 570.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 59
Number of associated phases, regardless of their use for origin computation 17
Number of defining phases 17
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.24
Epicentral distance of station closest to the epicenter (degree) 0.09353
Epicentral distance of station farthest from the epicenter (degree) 0.86874
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 10
Magnitudes information

ML:1.0

Field Value
Value 1.0
Uncertainty 0.3
Num. used stations 13
Type of magnitude ML
Reference to an origin 96746281
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-19 02:54:21

ML:1.2

Field Value
Value 1.2
Uncertainty 0.1
Num. used stations 2
Type of magnitude ML
Reference to an origin 97019181
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-10-27 10:26:53
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ARCI.HHZ. 2021-10-19T02:22:09.32 0.3 undecidable manual S 133 55.1004 50 -0.28 68
GU.POPM.HHZ. 2021-10-19T02:22:08.84 0.6 undecidable manual P 349 96.4257 50 0.13 44
IV.CELB.HHZ. 2021-10-19T02:22:06.34 0.3 undecidable manual P 232 79.4649 50 0.25 66
IV.CASP.HHZ. 2021-10-19T02:22:06.88 0.3 undecidable manual S 192 45.3213 50 -0.1 72
IV.OSSC.HHE. 2021-10-19T02:22:06.26 0.6 undecidable manual S 30 42.7239 50 -0.05 49
IV.CSNT.HHZ. 2021-10-19T02:22:05.44 0.3 undecidable manual S 39 40.1265 50 -0.18 72
IV.ARCI.HHZ. 2021-10-19T02:22:02.45 0.1 undecidable manual P 133 55.1004 50 0.12 94
IV.MAGO.CHZ. 2021-10-19T02:22:01.70 0.3 undecidable manual S 290 27.5502 50 -0.54 68
IV.CSNT.HHZ. 2021-10-19T02:22:00.36 0.3 undecidable manual P 39 40.1265 50 0.32 70
IV.CASP.HHZ. 2021-10-19T02:22:00.80 0.3 undecidable manual P 192 45.3213 50 -0.03 73
IV.OSSC.HHE. 2021-10-19T02:22:00.43 0.1 undecidable manual P 30 42.7239 50 -0.01 99
IV.RIBO.EHZ.01 2021-10-19T02:21:58.29 0.3 undecidable manual P 168 27.3504 50 0.23 73
IV.MAGO.CHZ. 2021-10-19T02:21:58.34 0.3 undecidable manual P 290 27.5502 50 0.25 72
IV.FROS.CHZ. 2021-10-19T02:21:58.36 0.3 undecidable manual S 81 14.4744 127 -0.36 72
IV.TRIF.CHZ. 2021-10-19T02:21:57.30 0.3 undecidable manual S 216 10.3785 136 -0.36 73
IV.FROS.CHZ. 2021-10-19T02:21:56.24 0.1 negative manual P 81 14.4744 127 0.19 100
IV.TRIF.CHZ. 2021-10-19T02:21:55.68 0.1 positive manual P 216 10.3785 136 0.24 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FROS.CHN. ML:1.3 0.000205 0.18 AML other m 2021-10-19T02:21:58.56
IV.FROS.CHE. ML:1.1 0.0001282 1.12 AML other m 2021-10-19T02:21:59.56
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