Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.0 on date 13-10-2020 and time 22:02:11 (Italy) in region 7 km N Montieri (GR)

A magnitude ML 1.0 earthquake occured in region: 7 km N Montieri (GR), on

  • 13-10-2020 20:02:11 (UTC)
  • 13-10-2020 22:02:11 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.2, 11.01 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
Montieri GR 7 1204 1204
Radicondoli SI 8 914 2118
Chiusdino SI 8 1903 4021
Castelnuovo di Val di Cecina PI 9 2231 6252
Monterotondo Marittimo GR 14 1371 7623
Monticiano SI 15 1571 9194
Pomarance PI 16 5897 15091
Casole d'Elsa SI 16 3897 18988
Massa Marittima GR 19 8375 27363
Sovicille SI 20 10116 37479

Municipalities with at least 50000 inhabitants

An earthquake occurred to
29 Km W of Siena (53903 inhabitants)
49 Km N of Grosseto (82087 inhabitants)
64 Km S of Scandicci (50609 inhabitants)
67 Km SW of Firenze (382808 inhabitants)
69 Km SE of Livorno (159219 inhabitants)
76 Km SE of Pisa (89158 inhabitants)
77 Km S of Prato (191150 inhabitants)
77 Km W of Arezzo (99543 inhabitants)
82 Km S of Pistoia (90315 inhabitants)
83 Km SE of Lucca (89046 inhabitants)
97 Km SE of Viareggio (62467 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100 		ML 1.0 2020-10-13
20:02:11		 43.2 11.01 5 2020-10-13
20:11:27		 Sala Sismica INGV-Roma 83762401
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-10-13 20:02:11 ± 0.11
Latitude 43.20 ± 0.01
Longitude 11.01 ± 0.01
Depth (km) 5 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 83762401

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 763
Semi-minor axis of confidence ellipse (meter) 171
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 341
Circular confidence region, given by single value of horizontal uncertainty (meter) 760
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 71
Number of associated phases, regardless of their use for origin computation 13
Number of defining phases 13
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.35
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.59895
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 9
Magnitude information

ML:1

Field Value
Value 1
Uncertainty 0.2
Num. used stations 4
Type of magnitude ML
Reference to an origin 83762401
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-10-13 20:11:27
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.CELB.HHZ. 2020-10-13T20:02:27.05 0.1 positive manual P 0 1.45
IV.CRMI.HHZ. 2020-10-13T20:02:24.37 0.1 undecidable manual P 358 0.5989 50 0.09 93
TV.SF01.EHZ. 2020-10-13T20:02:23.32 0.3 undecidable manual P 134 0.5567 50 -0.23 68
IV.ARCI.HHZ. 2020-10-13T20:02:22.20 0.3 undecidable manual P 135 0.4829 50 -0.09 71
IV.MAGO.CHZ. 2020-10-13T20:02:21.62 0.3 undecidable manual S 287 0.2689 98 -0.64 65
IV.RIBO.EHZ.01 2020-10-13T20:02:20.64 0.3 undecidable manual S 174 0.2491 99 -0.83 60
IV.CSNT.HHZ. 2020-10-13T20:02:19.14 0.1 undecidable manual P 36 0.3417 97 -0.28 94
IV.MAGO.CHZ. 2020-10-13T20:02:17.88 0.1 undecidable manual P 287 0.2689 98 0.06 100
IV.RIBO.EHZ.01 2020-10-13T20:02:17.46 0.1 undecidable manual P 174 0.2491 99 0.09 100
IV.TRIF.CHZ. 2020-10-13T20:02:16.72 0.3 undecidable manual S 224 0.1142 109 0.27 74
IV.FROS.CHZ. 2020-10-13T20:02:16.22 0.3 undecidable manual S 83 0.1052 111 0.11 77
IV.TRIF.CHZ. 2020-10-13T20:02:14.79 0.1 undecidable manual P 224 0.1142 109 0.32 98
IV.FROS.CHZ. 2020-10-13T20:02:14.54 0.1 undecidable manual P 83 0.1052 111 0.26 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MAGO.CHN. ML:1.3 9.75E-5 0.44 AML other m 2020-10-13T20:02:21.73
IV.MAGO.CHE. ML:1.1 6.715E-5 1.1 AML other m 2020-10-13T20:02:22.20
IV.CSNT.HHN. ML:1 3.36E-5 0.56 AML other m 2020-10-13T20:02:24.06
IV.CSNT.HHE. ML:0.8 2.31E-5 0.2 AML other m 2020-10-13T20:02:24.66
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download