Earthquake with magnitude of ML 0.4 on date 17-10-2021 and time 21:47:11 (Italy) in region 1 km E Montieri (GR)

A magnitude ML 0.4 earthquake occured in region: 1 km E Montieri (GR), on

  • 17-10-2021 19:47:11 (UTC)
  • 17-10-2021 21:47:11 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.132, 11.034 at 9 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.

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 1 1204 1204
Chiusdino SI 5 1903 3107
Monticiano SI 12 1571 4678
Castelnuovo di Val di Cecina PI 13 2231 6909
Monterotondo Marittimo GR 15 1371 8280
Radicondoli SI 15 914 9194
Massa Marittima GR 15 8375 17569
Roccastrada GR 17 9199 26768

Municipalities with at least 50000 inhabitants

An earthquake occurred to
32 Km SW of Siena (53903 inhabitants)
42 Km N of Grosseto (82087 inhabitants)
71 Km S of Scandicci (50609 inhabitants)
73 Km S of Firenze (382808 inhabitants)
75 Km SE of Livorno (159219 inhabitants)
78 Km W of Arezzo (99543 inhabitants)
83 Km SE of Pisa (89158 inhabitants)
84 Km S of Prato (191150 inhabitants)
90 Km S of Pistoia (90315 inhabitants)
90 Km SE of Lucca (89046 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web 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 0.4 2021-10-17
19:47:11
43.1318 11.0338 9 2021-10-17
19:58:13
Sala Sismica INGV-Roma 96694601
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-17 19:47:11 ± 0.24
Latitude 43.1318 ± 0.0090
Longitude 11.0338 ± 0.0136
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 96694601

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1142
Semi-minor axis of confidence ellipse (meter) 733
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 306
Circular confidence region, given by single value of horizontal uncertainty (meter) 1140
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 149
Number of associated phases, regardless of their use for origin computation 22
Number of defining phases 8
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.34
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.42718
Number of stations at which the event was observed 18
Number of stations from which data was used for origin computation 4
Magnitude information

ML:0.4

Field Value
Value 0.4
Uncertainty 0.2
Num. used stations 5
Type of magnitude ML
Reference to an origin 96694601
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-17 19:58:13
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
OT.OT17.EHZ. 2021-10-17T19:49:08.14 3.0 undecidable manual Sg 14.3 0
CR.ZAG.BHZ. 2021-10-17T19:49:05.82 3.0 undecidable manual Sn -2.1 0
IV.RESU.HHZ. 2021-10-17T19:48:36.80 3.0 positive manual Pn -3.55 0
MN.BLY.HHZ. 2021-10-17T19:48:33.14 3.0 negative manual Pg 13.41 0
IV.LRP.EHZ. 2021-10-17T19:48:22.19 3.0 undecidable manual Sn -5.29 0
IV.VENL.EHZ. 2021-10-17T19:48:15.65 3.0 undecidable manual Sn 0.45 0
IV.MRB1.HHZ. 2021-10-17T19:48:13.65 3.0 positive manual Pg 6.42 0
RF.GEPF.HHZ. 2021-10-17T19:48:10.65 3.0 undecidable manual Pg 12.05 0
SL.LJU.BHZ. 2021-10-17T19:48:10.42 3.0 negative manual Pn 5.65 0
IV.ARVD.HHZ. 2021-10-17T19:48:00.39 3.0 undecidable manual Sg 1.46 0
IV.SFI.EHZ. 2021-10-17T19:47:38.34 3.0 undecidable manual S -2.16 0
IV.FOSV.EHZ. 2021-10-17T19:47:36.16 3.0 negative manual Pg 2.22 0
IV.ARCI.HNN. 2021-10-17T19:47:26.37 0.3 undecidable manual S 131 0.4272 50 -0.34 67
IV.CAFI.HHZ. 2021-10-17T19:47:24.11 3.0 undecidable manual P -0.91 0
IV.ARCI.HNN. 2021-10-17T19:47:20.51 1.0 undecidable manual P 131 0.4272 50 0.36 22
IV.RIBO.EHZ.01 2021-10-17T19:47:18.80 0.1 undecidable manual S 177 0.1826 114 -0.12 99
IV.RIBO.EHZ.01 2021-10-17T19:47:16.04 0.1 undecidable manual P 177 0.1826 114 0.4 93
IV.FROS.CHZ. 2021-10-17T19:47:16.48 0.3 undecidable manual S 49 0.1187 125 -0.27 73
IV.TRIF.CHZ. 2021-10-17T19:47:15.73 0.3 undecidable manual S 260 0.0971 130 -0.37 71
IV.TRIF.CHZ. 2021-10-17T19:47:14.16 0.1 undecidable manual P 260 0.0971 130 0.14 100
IV.FROS.CHZ. 2021-10-17T19:47:14.63 0.1 undecidable manual P 49 0.1187 125 0.24 97
IV.OSSC.HHZ. 2021-10-17T19:47:10.73 3.0 undecidable manual P 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.TRIF.CHE. ML:0.5 3.773818E-5 0.0768 AML other m 2021-10-17T19:47:15.87
IV.TRIF.CHN. ML:0.6 5.0577765E-5 0.1024 AML other m 2021-10-17T19:47:15.86
IV.FROS.CHE. ML:0.3 1.82942815E-5 0.1536 AML other m 2021-10-17T19:47:16.59
IV.FROS.CHN. ML:0.3 1.982151E-5 0.128 AML other m 2021-10-17T19:47:17.12
IV.RIBO.EHE.01 ML:0.3 1.712942E-5 0.1664 AML other m 2021-10-17T19:47:18.89
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