Earthquake with magnitude of ML 1.1 on date 19-12-2020 and time 18:35:06 (UTC) in region 4 km N Montieri (GR)

A magnitude ML 1.1 earthquake occured in region: 4 km N Montieri (GR), on

  • 19-12-2020 18:35:06 (UTC)
  • 19-12-2020 19:35:06 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.17, 11.02 at 9 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Montieri GR 4 1204 1204
Chiusdino SI 6 1903 3107
Castelnuovo di Val di Cecina PI 10 2231 5338
Radicondoli SI 10 914 6252
Monterotondo Marittimo GR 13 1371 7623
Monticiano SI 14 1571 9194
Massa Marittima GR 17 8375 17569
Pomarance PI 19 5897 23466
Casole d'Elsa SI 19 3897 27363

Municipalities with at least 50000 inhabitants

An earthquake occurred to
30 Km SW of Siena (53903 inhabitants)
46 Km N of Grosseto (82087 inhabitants)
67 Km S of Scandicci (50609 inhabitants)
69 Km S of Firenze (382808 inhabitants)
71 Km SE of Livorno (159219 inhabitants)
77 Km W of Arezzo (99543 inhabitants)
79 Km SE of Pisa (89158 inhabitants)
79 Km S of Prato (191150 inhabitants)
85 Km S of Pistoia (90315 inhabitants)
86 Km SE of Lucca (89046 inhabitants)
99 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 1.1 2020-12-19
18:35:06
43.17 11.02 9 2021-02-26
14:56:15
Bollettino Sismico Italiano INGV 86226321
Reviewed
Rev100
ML 1.1 2020-12-19
18:35:07
43.14 11.04 8 2020-12-19
18:41:48
Sala Sismica INGV-Roma 85552351
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-12-19 18:35:06 ± 0.12
Latitude 43.17 ± 0.01
Longitude 11.02 ± 0.01
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 86226321

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 850
Semi-minor axis of confidence ellipse (meter) 512
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 311
Circular confidence region, given by single value of horizontal uncertainty (meter) 850
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 156
Number of associated phases, regardless of their use for origin computation 21
Number of defining phases 20
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
Epicentral distance of station farthest from the epicenter (degree) 0.61963
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 12
Magnitudes information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.3
Num. used stations 7
Type of magnitude ML
Reference to an origin 86226321
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-01-13 15:03:41

ML:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 7
Type of magnitude ML
Reference to an origin 85552351
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-12-19 18:41:48
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.IMOL.EHZ. 2020-12-19T18:35:30.07 3.0 positive manual Pg 7.97 0
TV.SF04.EHZ. 2020-12-19T18:35:27.22 0.6 undecidable manual S 125 0.5756 50 0.19 45
TV.SF13.HHZ. 2020-12-19T18:35:26.90 0.3 undecidable manual S 129 0.5621 50 0.26 67
TV.SF01.EHZ. 2020-12-19T18:35:25.74 0.6 undecidable manual S 132 0.5351 50 -0.09 46
IV.CASP.HHZ. 2020-12-19T18:35:20.86 0.3 undecidable manual S 197 0.3957 50 -0.84 57
IV.CSNT.HHZ. 2020-12-19T18:35:19.87 0.6 undecidable manual S 33 0.3606 50 -0.8 39
IV.MCIV.CHZ. 2020-12-19T18:35:19.33 0.1 undecidable manual P 129 0.6196 50 0.01 93
TV.SF03.EHZ. 2020-12-19T18:35:19.51 0.6 undecidable manual P 127 0.6097 50 0.36 43
TV.SF11.HHZ. 2020-12-19T18:35:18.52 0.1 undecidable manual P 122 0.5684 50 0.09 92
TV.SF13.HHZ. 2020-12-19T18:35:18.46 0.1 undecidable manual P 129 0.5621 50 0.13 92
TV.SF04.EHZ. 2020-12-19T18:35:18.69 0.1 undecidable manual P 125 0.5756 50 0.13 91
TV.SF01.EHZ. 2020-12-19T18:35:17.96 0.1 undecidable manual P 132 0.5351 50 0.09 93
IV.ARCI.HHZ. 2020-12-19T18:35:16.47 0.6 undecidable manual P 134 0.4605 50 -0.13 47
IV.RIBO.EHZ.01 2020-12-19T18:35:15.54 0.3 undecidable manual S 175 0.2221 109 -0.52 67
IV.CASP.HHZ. 2020-12-19T18:35:15.71 0.3 undecidable manual P 197 0.3957 50 0.23 70
IV.CSNT.HHZ. 2020-12-19T18:35:14.89 0.3 undecidable manual P 33 0.3606 50 0.01 73
IV.RIBO.EHZ.01 2020-12-19T18:35:12.44 0.6 undecidable manual P 175 0.2221 109 0.22 48
IV.TRIF.CHZ. 2020-12-19T18:35:11.90 0.3 undecidable manual S 237 0.1016 128 -0.03 77
IV.FROS.CHZ. 2020-12-19T18:35:11.70 0.3 undecidable manual S 68 0.107 126 -0.39 71
IV.FROS.CHZ. 2020-12-19T18:35:10.07 0.1 undecidable manual P 68 0.107 126 0.14 100
IV.TRIF.CHZ. 2020-12-19T18:35:10.15 0.1 undecidable manual P 237 0.1016 128 0.31 97
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FROS.CHE. ML:0 0.00012392055 0.0768 AML other m 2020-12-19T18:35:11.83
IV.TRIF.CHN. ML:0 0.00040008225 0.0896 AML other m 2020-12-19T18:35:12.27
IV.FROS.CHN. ML:0 0.0001715 1.4 AML other m 2020-12-19T18:35:12.98
IV.TRIF.CHE. ML:0 0.000434 0.86 AML other m 2020-12-19T18:35:12.34
IV.RIBO.EHE.01 ML:1 6.0100575E-5 0.192 AML other m 2020-12-19T18:35:15.58
IV.CASP.HHN. ML:0.9 2.468972E-5 1.8848 AML other m 2020-12-19T18:35:20.98
IV.CASP.HHE. ML:1 3.3484165E-5 1.7952 AML other m 2020-12-19T18:35:21.05
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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