Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.3 on date 28-12-2019 and time 02:30:29 (UTC) in region 2 km W Chiusdino (SI)

A magnitude ML 1.3 earthquake occured in region: 2 km W Chiusdino (SI), on

  • 28-12-2019 02:30:29 (UTC)
  • 28-12-2019 03:30:29 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.1570, 11.0640 at 4 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.

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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
Chiusdino SI 2 1903 1903
Montieri GR 5 1204 3107
Monticiano SI 10 1571 4678
Radicondoli SI 12 914 5592
Castelnuovo di Val di Cecina PI 14 2231 7823
Monterotondo Marittimo GR 17 1371 9194
Roccastrada GR 18 9199 18393
Massa Marittima GR 18 8375 26768
Sovicille SI 19 10116 36884

Municipalities with at least 50000 inhabitants

An earthquake occurred to
28 Km SW of Siena (53903 inhabitants)
44 Km N of Grosseto (82087 inhabitants)
68 Km S of Scandicci (50609 inhabitants)
70 Km S of Firenze (382808 inhabitants)
75 Km W of Arezzo (99543 inhabitants)
75 Km SE of Livorno (159219 inhabitants)
81 Km S of Prato (191150 inhabitants)
82 Km SE of Pisa (89158 inhabitants)
87 Km S of Pistoia (90315 inhabitants)
89 Km SE of Lucca (89046 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 1.3 2019-12-28
02:30:29		 43.1568 11.064 4 2019-12-28
02:34:44		 Sala Sismica INGV-Roma 75029161
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2019-12-28 02:30:29 ± 0.15
Latitude 43.1568 ± 0.0063
Longitude 11.0640 ± 0.0086
Depth (km) 4 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 75029161

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 859
Semi-minor axis of confidence ellipse (meter) 207
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 319
Circular confidence region, given by single value of horizontal uncertainty (meter) 860.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 132
Number of associated phases, regardless of their use for origin computation 11
Number of defining phases 10
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.28
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.74644
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 7
Magnitude information

ML:1.3

Field Value
Value 1.3
Uncertainty 0.2
Num. used stations 6
Type of magnitude ML
Reference to an origin 75029161
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2019-12-28 02:34:44
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MURB.HNZ. 2019-12-28T02:30:52.92 3.0 undecidable manual P 2.11 0
IV.CELB.HHZ. 2019-12-28T02:30:45.20 0.3 negative manual P 237 82.8504 50 0.26 63
IV.CASP.HHZ. 2019-12-28T02:30:38.32 0.6 positive manual P 202 43.7229 95 -0.32 44
IV.RIBO.EHZ.01 2019-12-28T02:30:37.86 0.1 undecidable manual S 184 23.0547 100 -0.13 96
IV.OSSC.HHZ. 2019-12-28T02:30:37.76 1.0 negative manual P 20 43.2234 95 -0.8 19
IV.MAGO.CHZ. 2019-12-28T02:30:36.50 0.3 negative manual P 292 35.2425 97 -0.47 65
IV.RIBO.EHZ.01 2019-12-28T02:30:34.64 1.0 undecidable manual P 184 23.0547 100 0.09 24
IV.TRIF.CHZ. 2019-12-28T02:30:34.95 0.1 undecidable manual S 250 13.875 106 0.08 98
IV.TRIF.CHZ. 2019-12-28T02:30:33.01 0.1 negative manual P 250 13.875 106 0.26 95
IV.FROS.CHZ. 2019-12-28T02:30:33.47 0.1 undecidable manual S 52 9.4794 113 0.03 100
IV.FROS.CHZ. 2019-12-28T02:30:32.10 0.1 positive manual P 52 9.4794 113 0.18 97
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FROS.CHE. ML:1.5 0.0006075 0.64 AML other m 2019-12-28T02:30:33.53
IV.FROS.CHN. ML:1.3 0.000367 1.38 AML other m 2019-12-28T02:30:34.06
IV.TRIF.CHN. ML:1.4 0.0003125 0.64 AML other m 2019-12-28T02:30:35.00
IV.TRIF.CHE. ML:1.4 0.00028149999999999996 1.18 AML other m 2019-12-28T02:30:35.16
IV.CASP.HHE. ML:1.0 0.00003325 0.5 AML other m 2019-12-28T02:30:50.84
IV.CASP.HHN. ML:1.0 0.000032600000000000006 0.54 AML other m 2019-12-28T02:30:57.30
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