Earthquake with magnitude of ML 1.6 on date 04-10-2021 and time 13:18:02 (Italy) in region 1 km NW Montieri (GR)

A magnitude ML 1.6 earthquake occured in region: 1 km NW Montieri (GR), on

  • 04-10-2021 11:18:02 (UTC)
  • 04-10-2021 13:18:02 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.139, 11.004 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 7 1903 3107
Castelnuovo di Val di Cecina PI 11 2231 5338
Monterotondo Marittimo GR 12 1371 6709
Massa Marittima GR 14 8375 15084
Radicondoli SI 14 914 15998
Monticiano SI 14 1571 17569
Roccastrada GR 19 9199 26768

Municipalities with at least 50000 inhabitants

An earthquake occurred to
33 Km SW of Siena (53903 inhabitants)
43 Km N of Grosseto (82087 inhabitants)
70 Km S of Scandicci (50609 inhabitants)
73 Km SE of Livorno (159219 inhabitants)
73 Km S of Firenze (382808 inhabitants)
80 Km W of Arezzo (99543 inhabitants)
81 Km SE of Pisa (89158 inhabitants)
83 Km S of Prato (191150 inhabitants)
88 Km SE of Lucca (89046 inhabitants)
89 Km S of Pistoia (90315 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 1.6 2021-10-04
11:18:02
43.1393 11.004 9 2021-10-04
12:49:45
Sala Sismica INGV-Roma 96205461
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-04 11:18:02 ± 0.1
Latitude 43.1393 ± 0.0090
Longitude 11.0040 ± 0.0111
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 96205461

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1139
Semi-minor axis of confidence ellipse (meter) 609
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 320
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) 133
Number of associated phases, regardless of their use for origin computation 33
Number of defining phases 14
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) 0.60974
Number of stations at which the event was observed 30
Number of stations from which data was used for origin computation 11
Magnitude information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.4
Num. used stations 6
Type of magnitude ML
Reference to an origin 96205461
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-04 12:49:45
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.SACR.HHZ. 2021-10-04T11:19:52.01 3.0 undecidable manual Sg 12.21 0
IV.ESCV.HHZ. 2021-10-04T11:19:47.67 3.0 negative manual Pg 11.72 0
IV.MILZ.HHZ. 2021-10-04T11:19:44.81 3.0 undecidable manual Pg 13.04 0
IV.SERS.HHZ. 2021-10-04T11:19:44.33 3.0 undecidable manual Pg 11.67 0
IV.ESAL.HHZ. 2021-10-04T11:19:34.03 3.0 positive manual Pn -3.4 0
IV.MPG.HHZ. 2021-10-04T11:19:33.64 3.0 undecidable manual Pg 9.01 0
IV.RNI2.HHZ. 2021-10-04T11:19:32.70 3.0 undecidable manual Sg 5.5 0
IX.SNR3.EHZ.02 2021-10-04T11:19:15.61 3.0 negative manual Pg 10.71 0
IV.VARE.HHZ. 2021-10-04T11:19:12.22 3.0 undecidable manual Sn -4.99 0
IV.MTSN.HHZ. 2021-10-04T11:19:11.07 3.0 undecidable manual Pn -2.52 0
IX.RSF3.HHZ.02 2021-10-04T11:19:04.68 3.0 undecidable manual Pn 2 0
IV.ZEN8.EHZ. 2021-10-04T11:18:59.09 3.0 undecidable manual Sg -1.92 0
IV.SRES.HHZ. 2021-10-04T11:18:54.80 3.0 undecidable manual Sg -1.64 0
IV.CRND.HNZ. 2021-10-04T11:18:43.40 3.0 undecidable manual Pg 5.25 0
OX.MARN.HHZ. 2021-10-04T11:18:35.50 3.0 undecidable manual Pg 1.94 0
IV.TERO.HHZ. 2021-10-04T11:18:35.72 3.0 undecidable manual Pn -0.71 0
IV.PCN.EHZ. 2021-10-04T11:18:25.25 3.0 positive manual Pg -2.62 0
IV.CASP.HHZ. 2021-10-04T11:18:15.05 0.3 undecidable manual S 196 0.3624 50 -0.85 57
IV.MCIV.CHE. 2021-10-04T11:18:14.54 0.3 undecidable manual P 126 0.6097 50 0.2 66
TV.SF03.EHZ. 2021-10-04T11:18:14.35 0.1 undecidable manual P 124 0.6016 50 0.16 89
TV.SF14.HHE. 2021-10-04T11:18:14.13 0.1 undecidable manual P 130 0.5891 50 0.15 89
TV.SF11.HHE. 2021-10-04T11:18:13.57 0.3 undecidable manual P 119 0.563 50 0.04 69
TV.SF04.EHZ. 2021-10-04T11:18:13.75 0.1 undecidable manual P 122 0.5675 50 0.13 90
IT.FIE.HGZ. 2021-10-04T11:18:11.55 3.0 undecidable manual S -1.78 0
IV.ARCI.HNZ. 2021-10-04T11:18:11.58 0.1 undecidable manual P 130 0.4488 50 0 95
IV.OSSC.HHZ. 2021-10-04T11:18:11.11 0.1 undecidable manual P 25 0.4227 50 -0.02 95
IV.CSNT.HHZ. 2021-10-04T11:18:10.57 0.3 undecidable manual P 32 0.393 50 -0.06 71
IV.CASP.HHZ. 2021-10-04T11:18:10.16 0.1 undecidable manual P 196 0.3624 50 0.05 95
IV.SNS1.HNZ. 2021-10-04T11:18:09.21 3.0 undecidable manual P 0
IV.FROS.CHZ. 2021-10-04T11:18:07.63 0.3 undecidable manual S 58 0.1313 121 -0.51 68
IV.TRIF.CHZ. 2021-10-04T11:18:06.36 0.3 undecidable manual S 252 0.0782 136 -0.15 74
IV.FROS.CHZ. 2021-10-04T11:18:05.67 0.1 positive manual P 58 0.1313 121 0.04 100
IV.TRIF.CHZ. 2021-10-04T11:18:05.06 0.1 undecidable manual P 252 0.0782 136 0.37 94
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FROS.CHE. ML:1.5 0.0003552895 0.1088 AML other m 2021-10-04T11:18:08.00
IV.FROS.CHN. ML:1.5 0.000324481 0.1472 AML other m 2021-10-04T11:18:08.28
IV.TRIF.CHN. ML:2.2 0.002425687 0.1024 AML other m 2021-10-04T11:18:06.69
IV.TRIF.CHE. ML:2.1 0.0017403755 0.0704 AML other m 2021-10-04T11:18:06.95
IV.CSNT.HHN. ML:0.5 1.1619105E-5 0.0768 AML other m 2021-10-04T11:18:10.80
TV.SF04.EHN. ML:1.4 4.8525285E-5 0.16 AML other m 2021-10-04T11:18:14.56
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