Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.3 on date 21-01-2021 and time 08:22:26 (UTC) in region 1 km E Montieri (GR)

A magnitude ML 1.3 earthquake occured in region: 1 km E Montieri (GR), on

  • 21-01-2021 08:22:26 (UTC)
  • 21-01-2021 09:22:26 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.13, 11.03 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.

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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 1 1204 1204
Chiusdino SI 6 1903 3107
Monticiano SI 12 1571 4678
Castelnuovo di Val di Cecina PI 13 2231 6909
Massa Marittima GR 14 8375 15284
Monterotondo Marittimo GR 14 1371 16655
Radicondoli SI 15 914 17569
Roccastrada GR 17 9199 26768

Municipalities with at least 50000 inhabitants

An earthquake occurred to
33 Km SW of Siena (53903 inhabitants)
41 Km N of Grosseto (82087 inhabitants)
71 Km S of Scandicci (50609 inhabitants)
74 Km S of Firenze (382808 inhabitants)
75 Km SE of Livorno (159219 inhabitants)
79 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)
91 Km SE of Lucca (89046 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled 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 1.3 2021-01-21
08:22:26		 43.13 11.03 9 2021-01-21
08:30:08		 Sala Sismica INGV-Roma 86425401
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-21 08:22:26 ± 0.17
Latitude 43.13 ± 0.01
Longitude 11.03 ± 0.02
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 86425401

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1413
Semi-minor axis of confidence ellipse (meter) 478
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 303
Circular confidence region, given by single value of horizontal uncertainty (meter) 1410
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 128
Number of associated phases, regardless of their use for origin computation 25
Number of defining phases 9
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.42
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.70687
Number of stations at which the event was observed 20
Number of stations from which data was used for origin computation 5
Magnitude information

ML:1.3

Field Value
Value 1.3
Uncertainty 0.3
Num. used stations 7
Type of magnitude ML
Reference to an origin 86425401
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-01-21 08:30:08
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.MCRV.HHZ. 2021-01-21T08:24:09.84 3.0 undecidable manual Sn 0.9 0
IV.TREM.HHZ. 2021-01-21T08:23:56.31 3.0 undecidable manual Sn -0.46 0
IV.STAL.HNZ. 2021-01-21T08:23:49.03 3.0 undecidable manual Sg 9.05 0
IT.GLNS.HNZ. 2021-01-21T08:23:22.86 3.0 undecidable manual Pg 13.88 0
SL.BOJS.BHZ. 2021-01-21T08:23:21.32 3.0 positive manual Pn 7.94 0
IT.MCLF.HNZ. 2021-01-21T08:23:20.35 3.0 undecidable manual Pg 12.02 0
IV.SENA.HHZ. 2021-01-21T08:23:10.12 3.0 undecidable manual Pg 4.66 0
IV.NDIM.HNZ. 2021-01-21T08:23:01.23 3.0 undecidable manual Sg 1.89 0
ST.CARE.EHZ. 2021-01-21T08:22:58.24 3.0 undecidable manual Pn -3.15 0
IV.ARRO.EHZ. 2021-01-21T08:22:54.82 3.0 undecidable manual Pg 9.03 0
IV.BRSN.HNZ. 2021-01-21T08:22:54.00 3.0 undecidable manual Sn -2.1 0
IT.FIE.HGZ. 2021-01-21T08:22:43.60 3.0 undecidable manual S 16 0.7069 50 -6.62 0
IV.FIR.HHZ. 2021-01-21T08:22:42.63 3.0 undecidable manual Sg 2.35 0
IV.APEC.HHZ. 2021-01-21T08:22:41.76 3.0 negative manual Pg 2.9 0
IT.FIE.HGZ. 2021-01-21T08:22:40.33 0.1 undecidable manual P 16 0.7069 50 0.22 86
IV.CPGN.EHZ. 2021-01-21T08:22:40.82 3.0 undecidable manual P 2.46 0
IV.CASP.HHZ. 2021-01-21T08:22:39.20 0.1 undecidable manual S 200 0.357 50 -0.65 82
IV.CSNT.HHZ. 2021-01-21T08:22:39.82 3.0 undecidable manual S 0.34 0
IV.CASP.HHZ. 2021-01-21T08:22:34.48 0.1 undecidable manual P 200 0.357 50 0.35 89
IV.RIBO.EHZ.01 2021-01-21T08:22:33.80 0.3 undecidable manual S 176 0.1781 114 -0.02 74
IV.RIBO.EHZ.01 2021-01-21T08:22:31.02 0.1 undecidable manual P 176 0.1781 114 0.37 92
IV.FROS.CHZ. 2021-01-21T08:22:31.50 0.3 undecidable manual S 48 0.1241 122 -0.48 68
IV.TRIF.CHZ. 2021-01-21T08:22:30.70 0.3 undecidable manual S 263 0.0926 130 -0.31 71
IV.TRIF.CHZ. 2021-01-21T08:22:29.25 0.1 negative manual P 263 0.0926 130 0.23 97
IV.FROS.CHZ. 2021-01-21T08:22:29.62 0.1 positive manual P 48 0.1241 122 0.03 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.TRIF.CHN. ML:0 0.00074889965 0.0832 AML other m 2021-01-21T08:22:31.16
IV.TRIF.CHE. ML:0 0.0006922286 0.1152 AML other m 2021-01-21T08:22:31.12
IV.FROS.CHN. ML:0 0.0002169923 0.192 AML other m 2021-01-21T08:22:31.75
IV.FROS.CHE. ML:0 0.00013600415 0.2176 AML other m 2021-01-21T08:22:31.54
IV.RIBO.EHE.01 ML:1.2 0.00013116863 0.1408 AML other m 2021-01-21T08:22:34.30
IV.CASP.HHN. ML:1.3 7.2240855E-5 0.1024 AML other m 2021-01-21T08:22:39.71
IV.CASP.HHE. ML:1.1 4.090372E-5 0.096 AML other m 2021-01-21T08:22:39.74
IV.CPGN.EHN. ML:1.8 4.2611705E-5 0.2368 AML other m 2021-01-21T08:22:43.09
IV.CPGN.HNE. ML:2.3 0.000142787835 0.7808 AML other m 2021-01-21T08:22:58.36
IV.CPGN.HNN. ML:2.6 0.00024563855 1.0304 AML other m 2021-01-21T08:22:54.05
IV.CPGN.EHE. ML:2 6.5439055E-5 0.224 AML other m 2021-01-21T08:22:45.49
IV.APEC.HNN. ML:3.2 0.0010695769 0.3904 AML other m 2021-01-21T08:23:15.26
IV.APEC.HHE. ML:1.6 2.82836E-5 0.1344 AML other m 2021-01-21T08:22:45.80
IV.APEC.HHN. ML:1.4 2.196561E-5 0.1792 AML other m 2021-01-21T08:23:13.03
IV.APEC.HNE. ML:3 0.0006794096 0.9728 AML other m 2021-01-21T08:22:47.41
ST.CARE.HNN. ML:3.7 0.000367715175 0.6784 AML other m 2021-01-21T08:23:52.59
ST.CARE.EHE. ML:3.6 0.00031029586 0.0768 AML other m 2021-01-21T08:23:06.95
ST.CARE.EHN. ML:3.9 0.0006088536 0.1984 AML other m 2021-01-21T08:23:00.62
ST.CARE.HNE. ML:4.1 0.000850687 0.8384 AML other m 2021-01-21T08:23:09.83
IV.SENA.HHE. ML:2.5 3.3976735E-5 1.8624 AML other m 2021-01-21T08:23:32.81
IV.SENA.HHN. ML:2.5 3.3744005E-5 2.656 AML other m 2021-01-21T08:23:57.39
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download