Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.0 on date 28-12-2019 and time 16:21:55 (UTC) in region 4 km NE Castelnuovo di Val di Cecina (PI)

A magnitude ML 1.0 earthquake occured in region: 4 km NE Castelnuovo di Val di Cecina (PI), on

  • 28-12-2019 16:21:55 (UTC)
  • 28-12-2019 17:21:55 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.2340, 10.9420 at 10 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.

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 4 2231 2231
Radicondoli SI 9 914 3145
Pomarance PI 9 5897 9042
Monterotondo Marittimo GR 12 1371 10413
Montieri GR 13 1204 11617
Casole d'Elsa SI 15 3897 15514
Chiusdino SI 15 1903 17417
Monteverdi Marittimo PI 19 758 18175
Volterra PI 20 10519 28694

Municipalities with at least 50000 inhabitants

An earthquake occurred to
33 Km W of Siena (53903 inhabitants)
54 Km N of Grosseto (82087 inhabitants)
62 Km SW of Scandicci (50609 inhabitants)
62 Km SE of Livorno (159219 inhabitants)
65 Km SW of Firenze (382808 inhabitants)
69 Km SE of Pisa (89158 inhabitants)
73 Km S of Prato (191150 inhabitants)
77 Km SE of Lucca (89046 inhabitants)
78 Km S of Pistoia (90315 inhabitants)
80 Km W of Arezzo (99543 inhabitants)
90 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
Reviewed
Rev100 		ML 1.0 2019-12-28
16:21:55		 43.2338 10.9422 10 2019-12-28
16:44:46		 Sala Sismica INGV-Roma 75051411
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2019-12-28 16:21:55 ± 0.15
Latitude 43.2338 ± 0.0081
Longitude 10.9422 ± 0.0123
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 75051411

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 923
Semi-minor axis of confidence ellipse (meter) 807
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 287
Circular confidence region, given by single value of horizontal uncertainty (meter) 920.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 116
Number of associated phases, regardless of their use for origin computation 14
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.4
Epicentral distance of station closest to the epicenter (degree) 0.12231
Epicentral distance of station farthest from the epicenter (degree) 0.44606
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitude information

ML:1.0

Field Value
Value 1.0
Uncertainty 0.3
Num. used stations 6
Type of magnitude ML
Reference to an origin 75051411
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2019-12-28 16:44:46
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CASP.HHZ. 2019-12-28T16:22:11.48 0.6 undecidable manual S 187 49.5171 50 -0.32 46
IV.OSSC.HNZ. 2019-12-28T16:22:09.28 0.6 undecidable manual S 37 40.4262 50 -0.09 49
IV.CSNT.HHZ. 2019-12-28T16:22:08.68 0.6 undecidable manual S 46 38.628 50 -0.21 48
IV.RIBO.EHZ.01 2019-12-28T16:22:06.91 0.6 undecidable manual S 165 32.745 50 -0.4 47
IV.CASP.HHZ. 2019-12-28T16:22:05.41 0.1 undecidable manual P 187 49.5171 50 0.36 92
IV.OSSC.HNZ. 2019-12-28T16:22:04.19 0.1 undecidable manual P 37 40.4262 50 0.55 88
IV.MAGO.CHZ. 2019-12-28T16:22:03.84 0.6 undecidable manual S 281 23.3544 112 -0.75 42
IV.RIBO.EHZ.01 2019-12-28T16:22:02.88 0.6 undecidable manual P 165 32.745 50 0.43 47
IV.FROS.CHZ. 2019-12-28T16:22:02.36 0.6 undecidable manual S 99 17.4714 119 -0.39 48
IV.CSNT.HHZ. 2019-12-28T16:22:02.68 0.1 undecidable manual P 46 38.628 50 -0.69 84
IV.MAGO.CHZ. 2019-12-28T16:22:01.15 0.1 undecidable manual P 281 23.3544 112 0.27 98
IV.TRIF.CHZ. 2019-12-28T16:22:01.05 0.6 undecidable manual S 194 13.5753 125 -0.55 46
IV.FROS.CHZ. 2019-12-28T16:22:00.10 0.1 undecidable manual P 99 17.4714 119 0.28 99
IV.TRIF.CHZ. 2019-12-28T16:21:59.40 0.1 positive manual P 194 13.5753 125 0.25 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.TRIF.CHE. ML:1.2 0.0001719849 0.2688 AML other m 2019-12-28T16:22:01.89
IV.TRIF.CHN. ML:1.2 0.0001671492 0.0896 AML other m 2019-12-28T16:22:01.69
IV.FROS.CHE. ML:0.7 0.000039989105 0.2944 AML other m 2019-12-28T16:22:02.58
IV.FROS.CHN. ML:0.6 0.000034952875 0.1536 AML other m 2019-12-28T16:22:03.01
IV.MAGO.CHE. ML:1.0 0.00006065404000000001 0.1152 AML other m 2019-12-28T16:22:04.57
IV.MAGO.CHN. ML:1.0 0.00006782775 0.2176 AML other m 2019-12-28T16:22:04.54
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