Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.2 on date 05-10-2021 and time 15:49:17 (UTC) in region 2 km NW Montieri (GR)

A magnitude ML 1.2 earthquake occured in region: 2 km NW Montieri (GR), on

  • 05-10-2021 15:49:17 (UTC)
  • 05-10-2021 17:49:17 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.1480, 11.0010 at 11 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 2 1204 1204
Chiusdino SI 7 1903 3107
Castelnuovo di Val di Cecina PI 10 2231 5338
Monterotondo Marittimo GR 12 1371 6709
Radicondoli SI 13 914 7623
Massa Marittima GR 14 8375 15998
Monticiano SI 15 1571 17569
Pomarance PI 20 5897 23466

Municipalities with at least 50000 inhabitants

An earthquake occurred to
33 Km SW of Siena (53903 inhabitants)
44 Km N of Grosseto (82087 inhabitants)
70 Km S of Scandicci (50609 inhabitants)
72 Km SE of Livorno (159219 inhabitants)
72 Km S of Firenze (382808 inhabitants)
80 Km SE of Pisa (89158 inhabitants)
80 Km W of Arezzo (99543 inhabitants)
82 Km S of Prato (191150 inhabitants)
87 Km SE of Lucca (89046 inhabitants)
88 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 1.2 2021-10-05
15:49:17		 43.1483 11.0008 11 2021-10-05
16:12:11		 Sala Sismica INGV-Roma 96263381
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-05 15:49:17 ± 0.18
Latitude 43.1483 ± 0.0117
Longitude 11.0008 ± 0.0148
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 96263381

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1260
Semi-minor axis of confidence ellipse (meter) 1189
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 5
Circular confidence region, given by single value of horizontal uncertainty (meter) 1260.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 125
Number of associated phases, regardless of their use for origin computation 21
Number of defining phases 10
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.46
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.37052
Number of stations at which the event was observed 16
Number of stations from which data was used for origin computation 5
Magnitude information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.3
Num. used stations 4
Type of magnitude ML
Reference to an origin 96263381
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-05 16:12:11
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ESAL.HHZ. 2021-10-05T15:51:07.85 3.0 undecidable manual Pg 29.98 0
IV.MTTG.HHZ. 2021-10-05T15:51:02.45 3.0 undecidable manual Pg 22.790001 0
IV.SACR.HHZ. 2021-10-05T15:51:00.60 3.0 undecidable manual Sg 1 0
IV.MPNC.HHZ. 2021-10-05T15:50:59.94 3.0 undecidable manual Pg 24.370001 0
GU.BHB.HHZ. 2021-10-05T15:50:46.60 3.0 undecidable manual Sg 58.060001 0
IV.POFI.HHZ. 2021-10-05T15:50:40.82 3.0 undecidable manual Sg 1.1 0
IV.MNTT.EHZ. 2021-10-05T15:50:18.33 3.0 undecidable manual Sg -9.99 0
IV.VAGA.HHZ. 2021-10-05T15:50:14.04 3.0 undecidable manual Pg 14.39 0
IV.MMO1.EHZ. 2021-10-05T15:49:41.75 3.0 undecidable manual Pn -3.79 0
IV.SSFR.HHZ. 2021-10-05T15:49:39.89 3.0 undecidable manual Pg -0.19 0
IV.CASP.HHE. 2021-10-05T15:49:30.27 0.3 undecidable manual S 196 41.1255 50 -0.36 70
IV.MAGO.CHE. 2021-10-05T15:49:27.34 0.3 undecidable manual S 297 30.9468 50 -0.58 67
IV.CASP.HHE. 2021-10-05T15:49:25.47 0.3 undecidable manual P 196 41.1255 50 0.54 67
IV.BDI.HHZ. 2021-10-05T15:49:25.66 3.0 negative manual P 3.85 0
IV.RIBO.EHZ.01 2021-10-05T15:49:25.29 0.1 undecidable manual S 170 22.4553 50 -0.34 96
IV.MAGO.CHE. 2021-10-05T15:49:23.89 0.3 undecidable manual P 297 30.9468 50 0.53 68
IV.FROS.CHZ. 2021-10-05T15:49:22.99 0.1 undecidable manual S 62 14.2746 127 -0.39 97
IV.RIBO.EHZ.01 2021-10-05T15:49:22.41 0.1 undecidable manual P 170 22.4553 50 0.37 96
IV.TRIF.CHZ. 2021-10-05T15:49:21.60 0.3 undecidable manual S 245 8.7801 141 -0.4 73
IV.TRIF.CHZ. 2021-10-05T15:49:20.29 0.1 negative manual P 245 8.7801 141 0.34 99
IV.FROS.CHZ. 2021-10-05T15:49:20.98 0.1 undecidable manual P 62 14.2746 127 0.23 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.TRIF.CHN. ML:1.3 0.0002845 0.42 AML other m 2021-10-05T15:49:21.78
IV.TRIF.CHE. ML:1.5 0.0004445 0.92 AML other m 2021-10-05T15:49:22.63
IV.FROS.CHE. ML:1.0 0.00009875584500000001 2.176 AML other m 2021-10-05T15:49:24.25
IV.FROS.CHN. ML:0.9 0.00006998784999999998 4.6848 AML other m 2021-10-05T15:49:26.13
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