Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.6 on date 02-10-2021 and time 00:25:52 (Italy) in region 6 km S Montieri (GR)

A magnitude ML 0.6 earthquake occured in region: 6 km S Montieri (GR), on

  • 01-10-2021 22:25:52 (UTC)
  • 02-10-2021 00:25:52 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.0790, 11.0280 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.

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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 6 1204 1204
Chiusdino SI 10 1903 3107
Massa Marittima GR 12 8375 11482
Roccastrada GR 14 9199 20681
Monticiano SI 14 1571 22252
Monterotondo Marittimo GR 16 1371 23623
Castelnuovo di Val di Cecina PI 17 2231 25854
Gavorrano GR 20 8580 34434

Municipalities with at least 50000 inhabitants

An earthquake occurred to
36 Km N of Grosseto (82087 inhabitants)
36 Km SW of Siena (53903 inhabitants)
77 Km S of Scandicci (50609 inhabitants)
79 Km SE of Livorno (159219 inhabitants)
79 Km S of Firenze (382808 inhabitants)
82 Km SW of Arezzo (99543 inhabitants)
87 Km SE of Pisa (89158 inhabitants)
89 Km S of Prato (191150 inhabitants)
95 Km SE of Lucca (89046 inhabitants)
96 Km S of Pistoia (90315 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 0.6 2021-10-01
22:25:52		 43.0792 11.028 11 2021-10-01
22:32:54		 Sala Sismica INGV-Roma 96114981
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-01 22:25:52 ± 0.15
Latitude 43.0792 ± 0.0090
Longitude 11.0280 ± 0.0123
Depth (km) 11 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 96114981

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 936
Semi-minor axis of confidence ellipse (meter) 909
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 40
Circular confidence region, given by single value of horizontal uncertainty (meter) 940.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 90
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) 0.41
Epicentral distance of station closest to the epicenter (degree) 0.09803
Epicentral distance of station farthest from the epicenter (degree) 0.68438
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:0.6

Field Value
Value 0.6
Uncertainty 0.4
Num. used stations 8
Type of magnitude ML
Reference to an origin 96114981
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-01 22:32:54
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CELB.HHE. 2021-10-01T22:26:06.96 0.3 undecidable manual P 241 75.9684 50 0.86 55
IV.ARCI.HNN. 2021-10-01T22:26:06.91 0.3 undecidable manual S 125 44.2224 50 -0.38 70
IV.CASP.HHZ. 2021-10-01T22:26:04.26 0.6 undecidable manual S 203 34.6431 50 -0.47 46
IV.MAGO.CHZ. 2021-10-01T22:26:04.91 0.6 undecidable manual S 306 36.8298 50 -0.43 47
IV.ARCI.HNN. 2021-10-01T22:26:01.76 0.6 undecidable manual P 125 44.2224 50 0.55 44
IV.CASP.HHZ. 2021-10-01T22:26:00.10 0.6 undecidable manual P 203 34.6431 50 0.37 47
IV.FROS.CHZ. 2021-10-01T22:25:59.76 0.3 undecidable manual S 36 17.871 121 -0.33 74
IV.MAGO.CHZ. 2021-10-01T22:25:59.50 0.6 undecidable manual P 306 36.8298 50 -0.58 44
IV.RIBO.EHZ.01 2021-10-01T22:25:58.66 0.3 undecidable manual S 174 14.4744 126 -0.47 72
IV.FROS.CHZ. 2021-10-01T22:25:57.41 0.1 positive manual P 36 17.871 121 0.35 98
IV.TRIF.CHZ. 2021-10-01T22:25:57.81 0.3 undecidable manual S 291 10.878 134 -0.35 74
IV.TRIF.CHZ. 2021-10-01T22:25:56.25 0.1 negative manual P 291 10.878 134 0.31 100
IV.RIBO.EHZ.01 2021-10-01T22:25:56.78 0.3 undecidable manual P 174 14.4744 126 0.28 75
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.TRIF.CHN. ML:0.8 0.00007565 0.1 AML other m 2021-10-01T22:25:57.88
IV.TRIF.CHE. ML:0.8 0.00007799587 0.0768 AML other m 2021-10-01T22:25:57.88
IV.FROS.CHN. ML:0.3 0.00001291095 0.2432 AML other m 2021-10-01T22:26:01.93
IV.FROS.CHE. ML:0.3 0.0000133792805 0.256 AML other m 2021-10-01T22:26:01.98
IV.CASP.HHN. ML:0.4 0.0000093991565 0.2048 AML other m 2021-10-01T22:26:04.58
IV.CASP.HNE. ML:1.4 0.0001073413 0.8192 AML other m 2021-10-01T22:26:11.32
IV.CASP.HNN. ML:1.5 0.0001248832 1.0624 AML other m 2021-10-01T22:26:13.34
IV.CASP.HHE. ML:0.4 0.000010825389500000001 0.128 AML other m 2021-10-01T22:26:04.68
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