Earthquake with magnitude of ML 1.6 on date 18-09-2021 and time 07:43:29 (Italy) in region 6 km SE Montieri (GR)

A magnitude ML 1.6 earthquake occured in region: 6 km SE Montieri (GR), on

  • 18-09-2021 05:43:29 (UTC)
  • 18-09-2021 07:43:29 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.091, 11.074 at 7 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 7 1204 1204
Chiusdino SI 7 1903 3107
Monticiano SI 10 1571 4678
Roccastrada GR 12 9199 13877
Massa Marittima GR 16 8375 22252
Monterotondo Marittimo GR 19 1371 23623
Castelnuovo di Val di Cecina PI 19 2231 25854
Radicondoli SI 19 914 26768
Civitella Paganico GR 20 3154 29922

Municipalities with at least 50000 inhabitants

An earthquake occurred to
33 Km SW of Siena (53903 inhabitants)
37 Km N of Grosseto (82087 inhabitants)
75 Km S of Scandicci (50609 inhabitants)
77 Km S of Firenze (382808 inhabitants)
78 Km SW of Arezzo (99543 inhabitants)
80 Km SE of Livorno (159219 inhabitants)
88 Km S of Prato (191150 inhabitants)
88 Km SE of Pisa (89158 inhabitants)
95 Km S of Pistoia (90315 inhabitants)
96 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 1.6 2021-09-18
05:43:29
43.0912 11.0745 7 2021-09-18
05:51:37
Sala Sismica INGV-Roma 95573291
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-18 05:43:29 ± 0.32
Latitude 43.0912 ± 0.0171
Longitude 11.0745 ± 0.0160
Depth (km) 7 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 95573291

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1951
Semi-minor axis of confidence ellipse (meter) 1007
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 211
Circular confidence region, given by single value of horizontal uncertainty (meter) 1950
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 200
Number of associated phases, regardless of their use for origin computation 30
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.52
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.72036
Number of stations at which the event was observed 24
Number of stations from which data was used for origin computation 7
Magnitude information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.1
Num. used stations 8
Type of magnitude ML
Reference to an origin 95573291
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-18 05:51:37
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.SPS2.HHZ. 2021-09-18T05:44:38.16 3.0 negative manual Pg 20.82 0
IV.IFIL.HHZ. 2021-09-18T05:44:32.30 3.0 positive manual Pg 14.55 0
IV.CET2.HHZ. 2021-09-18T05:44:12.55 3.0 undecidable manual Pn 0.14 0
IV.PZUN.HHZ. 2021-09-18T05:44:10.75 3.0 negative manual Pg 11.69 0
IX.SCL3.EHZ.02 2021-09-18T05:44:10.44 3.0 negative manual Pg 13.76 0
IV.IST3.HHZ. 2021-09-18T05:44:06.57 3.0 positive manual Pn -9.99 0
IV.VBKN.HHZ. 2021-09-18T05:44:03.30 3.0 positive manual Pg 14.23 0
IV.TOLF.HHZ. 2021-09-18T05:44:01.92 3.0 undecidable manual Sg 6.06 0
IV.CDRU.HHZ. 2021-09-18T05:43:58.92 3.0 undecidable manual Pn 1.19 0
IV.CELB.HHZ. 2021-09-18T05:43:54.04 0.1 undecidable manual S 242 0.7204 50 0.13 88
TV.SF04.EHZ. 2021-09-18T05:43:46.76 0.1 undecidable manual S 121 0.4991 50 -0.6 82
IV.ARCI.HHZ. 2021-09-18T05:43:43.21 0.1 undecidable manual S 129 0.3786 50 -0.57 85
IV.CELB.HHZ. 2021-09-18T05:43:43.73 0.1 undecidable manual P 242 0.7204 50 0.25 85
IV.VVLD.HHZ. 2021-09-18T05:43:42.73 3.0 negative manual Pg 9.86 0
TV.SF04.EHZ. 2021-09-18T05:43:40.49 0.1 undecidable manual P 121 0.4991 50 0.8 75
IV.ARCI.HHZ. 2021-09-18T05:43:38.00 0.1 undecidable manual P 129 0.3786 50 0.37 90
IV.VENT.EHZ. 2021-09-18T05:43:38.15 3.0 negative manual Pn -6.99 0
IV.CASP.HHZ. 2021-09-18T05:43:36.43 0.1 undecidable manual P 207 0.3372 101 -0.42 89
IV.RIBO.EHZ.01 2021-09-18T05:43:35.33 0.1 undecidable manual S 188 0.1439 114 0.06 100
IV.TRIF.CHZ. 2021-09-18T05:43:34.06 0.1 undecidable manual S 281 0.1277 116 -0.66 86
IV.RIBO.EHZ.01 2021-09-18T05:43:33.08 0.1 undecidable manual P 188 0.1439 114 0.36 94
IV.FROS.CHZ. 2021-09-18T05:43:33.73 3.0 undecidable manual Sg 3.78 0
IV.TRIF.CHZ. 2021-09-18T05:43:32.66 0.1 undecidable manual P 281 0.1277 116 0.26 96
IV.PE3.EHZ. 2021-09-18T05:43:29.15 1.0 undecidable manual Sg 4.05 0.51
IV.MNTP.HNZ. 2021-09-18T05:43:20.05 3.0 negative manual Pn 1.44 0
OX.CIMO.HHZ. 2021-09-18T05:43:19.25 3.0 negative manual Pn 1.97 0
IV.TOLF.HHZ. 2021-09-18T05:43:15.52 3.0 undecidable manual Pn -9.54 0
IV.NDIM.HHZ. 2021-09-18T05:43:15.77 3.0 undecidable manual Sn 0.21 0
IV.BRSN.EHZ. 2021-09-18T05:43:09.07 3.0 positive manual Pg 7.03 0
IV.IMOL.HNZ. 2021-09-18T05:43:01.03 3.0 negative manual P 0.29 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NDIM.HHE. ML:3.4 0.000821 0.22 AML other m 2021-09-18T05:43:20.85
IV.NDIM.HHN. ML:3.1 0.000396 0.4 AML other m 2021-09-18T05:43:20.66
IV.TRIF.CHN. ML:1.6 0.000459 0.28 AML other m 2021-09-18T05:43:34.20
IV.TRIF.CHE. ML:1.6 0.000503 0.24 AML other m 2021-09-18T05:43:34.23
IV.FROS.CHN. ML:1.8 0.0006255 0.22 AML other m 2021-09-18T05:43:36.46
IV.FROS.CHE. ML:1.6 0.000481 0.68 AML other m 2021-09-18T05:43:37.47
IV.CASP.HHE. ML:1.7 0.000176 1.78 AML other m 2021-09-18T05:43:40.02
IV.CASP.HHN. ML:1.7 0.0002005 0.32 AML other m 2021-09-18T05:43:40.97
IV.ARCI.HHN. ML:1.4 7.405E-5 0.12 AML other m 2021-09-18T05:43:43.40
IV.ARCI.HHE. ML:1.4 8.575E-5 1.08 AML other m 2021-09-18T05:43:43.94
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