Earthquake with magnitude of ML 1.0 on date 19-10-2021 and time 02:21:52 (UTC) in region 6 km E Castelnuovo di Val di Cecina (PI)

A magnitude ML 1.0 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) 43.204, 10.985 at 8 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

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.

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
Radicondoli SI 8 914 3145
Montieri GR 9 1204 4349
Chiusdino SI 10 1903 6252
Monterotondo Marittimo GR 12 1371 7623
Pomarance PI 14 5897 13520
Casole d'Elsa SI 16 3897 17417
Monticiano SI 17 1571 18988
Massa Marittima GR 19 8375 27363

Municipalities with at least 50000 inhabitants

An earthquake occurred to
31 Km W of Siena (53903 inhabitants)
50 Km N of Grosseto (82087 inhabitants)
64 Km S of Scandicci (50609 inhabitants)
67 Km SW of Firenze (382808 inhabitants)
67 Km SE of Livorno (159219 inhabitants)
74 Km SE of Pisa (89158 inhabitants)
76 Km S of Prato (191150 inhabitants)
78 Km W of Arezzo (99543 inhabitants)
81 Km SE of Lucca (89046 inhabitants)
81 Km S of Pistoia (90315 inhabitants)
95 Km SE of Viareggio (62467 inhabitants)
Recent and historical seismicity
Seismic hazard
Felt maps
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web questionnaire

This map shows the distribution of earthquake resentment in the area, expressed in terms of intensity on the MCS scale (Mercalli-Cancani-Sieberg). Intensities are determined using data from questionnaires collected on the website The intensities shown are determined considering all the reports received from each municipality, and are all the more reliable the greater the number of questionnaires. The collected data are subjected to an automatic statistical filter, but are not checked individually. In particular, intensities greater than or equal to the VI degree of the MCS or EMS scale require on-site verification by specialized personnel. The black star is the epicenter of the earthquake that occurred. This map is updated every time citizens fill out new questionnaires. The number of questionnaires processed to obtain this map, the date and time of the last update are shown at the top right.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
ML 1.0 2021-10-19
43.2043 10.9848 9 2021-10-19
Sala Sismica INGV-Roma 96746281
Preferred location and magnitude until now.
Origin information


Field Value
Time (UTC) 2021-10-19 02:21:52 ± 0.24
Latitude 43.2043 ± 0.0171
Longitude 10.9848 ± 0.0197
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 96746281


Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 2269
Semi-minor axis of confidence ellipse (meter) 637
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 141
Circular confidence region, given by single value of horizontal uncertainty (meter) 2270
Confidence level of the uncertainty (%) 68


Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 168
Number of associated phases, regardless of their use for origin computation 10
Number of defining phases 10
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.43
Epicentral distance of station closest to the epicenter (degree) 0.10792
Epicentral distance of station farthest from the epicenter (degree) 0.72755
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitude information


Field Value
Value 1
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
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.CELB.HHZ. 2021-10-19T02:22:07.79 0.1 undecidable manual P 231 0.7276 50 0.89 68
IV.CSNT.HHZ. 2021-10-19T02:22:05.43 0.3 undecidable manual S 39 0.348 50 -0.62 62
IV.ARCI.HHZ. 2021-10-19T02:22:03.09 0.1 undecidable manual P 134 0.5027 50 0.05 93
IV.CASP.HHZ. 2021-10-19T02:22:01.45 0.1 undecidable manual P 192 0.4227 50 -0.22 91
IV.CSNT.HHZ. 2021-10-19T02:22:00.43 0.1 undecidable manual P 39 0.348 50 0.02 96
IV.RIBO.EHZ.01 2021-10-19T02:21:58.54 0.1 positive manual P 170 0.259 106 -0.17 95
IV.FROS.CHZ. 2021-10-19T02:21:58.49 0.3 undecidable manual S 87 0.125 121 0.15 73
IV.TRIF.CHZ. 2021-10-19T02:21:57.26 0.3 undecidable manual S 214 0.1079 125 -0.52 68
IV.FROS.CHZ. 2021-10-19T02:21:56.24 0.1 negative manual P 87 0.125 121 0.29 95
IV.TRIF.CHZ. 2021-10-19T02:21:55.68 0.1 positive manual P 214 0.1079 125 0.05 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.TRIF.CHN. ML:1.5 0.0004268085 0.088 AML other m 2021-10-19T02:21:57.62
IV.TRIF.CHE. ML:1.5 0.0004071812 0.096 AML other m 2021-10-19T02:21:58.05
IV.FROS.CHN. ML:1.1 0.0001520988 0.088 AML other m 2021-10-19T02:21:59.15
IV.FROS.CHE. ML:1 0.000120267585 0.12 AML other m 2021-10-19T02:21:58.56
IV.RIBO.EHE.01 ML:0.8 3.477258E-5 0.16 AML other m 2021-10-19T02:22:02.60
IV.CSNT.HHN. ML:0.4 9.859213E-6 0.16 AML other m 2021-10-19T02:22:05.55
IV.CSNT.HHE. ML:0.4 8.5662035E-6 0.12 AML other m 2021-10-19T02:22:05.77
IV.CASP.HNN. ML:3.1 0.0032796045 2.2592 AML other m 2021-10-19T02:22:05.00
IV.CASP.HHE. ML:0.5 9.3202635E-6 0.1392 AML other m 2021-10-19T02:22:11.63
IV.CASP.HHN. ML:0.5 7.824787E-6 0.1584 AML other m 2021-10-19T02:22:11.55
IV.CASP.HNE. ML:1.6 0.00012136175 0.6992 AML other m 2021-10-19T02:22:12.51
IV.ARCI.HNN. ML:1.4 5.3312675E-5 0.84 AML other m 2021-10-19T02:22:03.17
IV.ARCI.HHE. ML:0.6 1.14708255E-5 1.8208 AML other m 2021-10-19T02:22:26.49
IV.ARCI.HHN. ML:0.6 1.0314335E-5 0.2592 AML other m 2021-10-19T02:22:09.91
IV.ARCI.HNE. ML:1.3 4.9660005E-5 0.96 AML other m 2021-10-19T02:22:26.00
IV.CELB.HHN. ML:0.9 1.2309528E-5 0.44 AML other m 2021-10-19T02:22:23.42
IV.CELB.HHE. ML:0.9 7.839258E-6 0.72 AML other m 2021-10-19T02:22:06.90
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download