Earthquake with magnitude of ML 1.0 on date 19-09-2021 and time 06:11:23 (UTC) in region 6 km S Montieri (GR)

A magnitude ML 1.0 earthquake occured in region: 6 km S Montieri (GR), on

  • 19-09-2021 06:11:23 (UTC)
  • 19-09-2021 08:11:23 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.076, 11.029 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.

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 13 9199 20681
Monticiano SI 14 1571 22252
Monterotondo Marittimo GR 16 1371 23623
Castelnuovo di Val di Cecina PI 18 2231 25854
Gavorrano GR 19 8580 34434

Municipalities with at least 50000 inhabitants

An earthquake occurred to
36 Km N of Grosseto (82087 inhabitants)
37 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)
90 Km S of Prato (191150 inhabitants)
96 Km SE of Lucca (89046 inhabitants)
96 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 1.0 2021-09-19
06:11:23
43.076 11.0292 10 2021-09-19
06:20:47
Sala Sismica INGV-Roma 95621971
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-19 06:11:23 ± 0.12
Latitude 43.0760 ± 0.0072
Longitude 11.0292 ± 0.0111
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 95621971

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 807
Semi-minor axis of confidence ellipse (meter) 777
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 53
Circular confidence region, given by single value of horizontal uncertainty (meter) 810
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 11
Number of defining phases 11
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.35
Epicentral distance of station closest to the epicenter (degree) 0.09982
Epicentral distance of station farthest from the epicenter (degree) 0.3957
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitude information

ML:1

Field Value
Value 1
Uncertainty 0.3
Num. used stations 13
Type of magnitude ML
Reference to an origin 95621971
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-19 06:20:47
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.ARCI.HHZ. 2021-09-19T06:11:37.77 0.3 undecidable manual S 124 0.3957 50 -0.48 67
IV.CASP.HHZ. 2021-09-19T06:11:35.23 0.3 undecidable manual S 203 0.3094 50 -0.45 68
IV.ARCI.HHZ. 2021-09-19T06:11:32.50 0.1 undecidable manual P 124 0.3957 50 0.34 92
IV.MAGO.CHZ. 2021-09-19T06:11:31.26 0.1 undecidable manual P 306 0.3345 50 0.14 97
IV.CASP.HHZ. 2021-09-19T06:11:30.86 0.1 undecidable manual P 203 0.3094 50 0.17 97
IV.FROS.CHZ. 2021-09-19T06:11:30.63 0.3 undecidable manual S 35 0.1628 119 -0.41 71
IV.RIBO.EHZ.01 2021-09-19T06:11:29.80 0.3 undecidable manual S 174 0.1277 126 -0.1 76
IV.FROS.CHZ. 2021-09-19T06:11:28.23 0.1 undecidable manual P 35 0.1628 119 0.23 98
IV.TRIF.CHZ. 2021-09-19T06:11:28.60 0.3 undecidable manual S 293 0.0998 132 -0.48 71
IV.TRIF.CHZ. 2021-09-19T06:11:27.08 0.1 negative manual P 293 0.0998 132 0.21 100
IV.RIBO.EHZ.01 2021-09-19T06:11:27.63 0.1 undecidable manual P 174 0.1277 126 0.28 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.TRIF.CHN. ML:1.1 0.0001575 0.28 AML other m 2021-09-19T06:11:28.75
IV.TRIF.CHE. ML:1.1 0.00015349675 0.08 AML other m 2021-09-19T06:11:28.93
IV.FROS.CHN. ML:1 8.5884325E-5 0.1984 AML other m 2021-09-19T06:11:30.98
IV.FROS.CHE. ML:1 7.61E-5 0.7 AML other m 2021-09-19T06:11:31.98
IV.RIBO.EHE.01 ML:1.2 0.0001689946 0.1792 AML other m 2021-09-19T06:11:29.97
IV.CASP.HHN. ML:0.4 1.178536E-5 0.08 AML other m 2021-09-19T06:11:35.56
IV.CASP.HNE. ML:1.4 9.32899E-5 0.6208 AML other m 2021-09-19T06:11:44.83
IV.CASP.HNN. ML:1.5 0.000125691615 0.8224 AML other m 2021-09-19T06:11:33.19
IV.CASP.HHE. ML:0.4 1.20994135E-5 0.0576 AML other m 2021-09-19T06:11:35.49
IV.ARCI.HHN. ML:0.5 8.672681E-6 0.08 AML other m 2021-09-19T06:11:38.18
IV.ARCI.HNE. ML:1.1 4.042684E-5 0.7712 AML other m 2021-09-19T06:11:34.82
IV.ARCI.HNN. ML:1 3.045882E-5 0.9504 AML other m 2021-09-19T06:11:35.42
IV.ARCI.HHE. ML:0.5 1.186498E-5 1.4976 AML other m 2021-09-19T06:11:44.23
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