Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.9 on date 30-09-2021 and time 12:55:42 (UTC) in region Montieri (GR)

A magnitude ML 1.9 earthquake occured in region: Montieri (GR), on

  • 30-09-2021 12:55:42 (UTC)
  • 30-09-2021 14:55:42 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.1300, 11.0120 at 11 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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 7 1903 3107
Castelnuovo di Val di Cecina PI 12 2231 5338
Monterotondo Marittimo GR 13 1371 6709
Massa Marittima GR 13 8375 15084
Monticiano SI 14 1571 16655
Radicondoli SI 15 914 17569
Roccastrada GR 18 9199 26768

Municipalities with at least 50000 inhabitants

An earthquake occurred to
34 Km SW of Siena (53903 inhabitants)
42 Km N of Grosseto (82087 inhabitants)
71 Km S of Scandicci (50609 inhabitants)
74 Km SE of Livorno (159219 inhabitants)
74 Km S of Firenze (382808 inhabitants)
80 Km W of Arezzo (99543 inhabitants)
82 Km SE of Pisa (89158 inhabitants)
84 Km S of Prato (191150 inhabitants)
90 Km SE of Lucca (89046 inhabitants)
90 Km S of Pistoia (90315 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000 		ML 1.9 2021-09-30
12:55:42		 43.1298 11.0115 11 2022-03-30
13:04:11		 Bollettino Sismico Italiano INGV 96718881
Reviewed
Rev100 		ML 1.9 2021-09-30
12:55:42		 43.1457 11.0052 8 2021-09-30
13:04:11		 Sala Sismica INGV-Roma 96066421
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-30 12:55:42 ± 0.11
Latitude 43.1298 ± 0.0054
Longitude 11.0115 ± 0.0086
Depth (km) 11 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 96718881

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 566
Semi-minor axis of confidence ellipse (meter) 403
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 242
Circular confidence region, given by single value of horizontal uncertainty (meter) 570.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 44
Number of associated phases, regardless of their use for origin computation 49
Number of defining phases 43
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.43
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 1.07289
Number of stations at which the event was observed 30
Number of stations from which data was used for origin computation 24
Magnitudes information

ML:1.9

Field Value
Value 1.9
Uncertainty 0.3
Num. used stations 30
Type of magnitude ML
Reference to an origin 96718881
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-03-07 16:57:28

ML:1.9

Field Value
Value 1.9
Uncertainty 0.3
Num. used stations 30
Type of magnitude ML
Reference to an origin 96066421
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-30 13:04:11
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.RSP.HHZ. 2021-09-30T12:57:32.80 3.0 undecidable manual Sg 16.66 0
IV.IOCA.HHZ. 2021-09-30T12:57:22.22 3.0 undecidable manual Sg 9.72 0
SL.LJU.BHZ. 2021-09-30T12:56:57.12 3.0 negative manual Pg 15.36 0
IV.ZEN8.EHZ. 2021-09-30T12:56:55.74 3.0 undecidable manual Sn 0.58 0
MN.VSL.HHZ. 2021-09-30T12:56:43.26 3.0 negative manual Pn 1.44 0
IV.SBPO.HNZ. 2021-09-30T12:56:41.64 3.0 undecidable manual Sg 0.99 0
GU.MAIM.HHZ. 2021-09-30T12:56:10.38 0.3 undecidable manual S 334 96.4257 50 -0.81 52
IV.RUFI.EHZ. 2021-09-30T12:56:09.18 0.6 undecidable manual S 27 88.1451 50 0.19 43
IV.CAFI.HHZ. 2021-09-30T12:56:06.51 0.3 undecidable manual S 74 80.2641 50 -0.36 63
IV.CELB.HHZ. 2021-09-30T12:56:05.84 0.3 undecidable manual S 237 77.6667 50 -0.35 63
IV.PII.HHZ. 2021-09-30T12:56:05.79 0.6 undecidable manual S 329 76.4679 50 -0.07 45
IV.LMD.HHZ. 2021-09-30T12:56:04.00 0.3 undecidable manual P 28 119.0919 50 1.29 40
IV.CRMI.HHZ. 2021-09-30T12:56:04.81 0.3 undecidable manual S 358 73.8705 50 -0.36 64
IV.MCIV.CHZ. 2021-09-30T12:56:02.63 0.3 undecidable manual S 126 66.5778 50 -0.59 61
TV.SF03.EHZ. 2021-09-30T12:56:02.56 0.3 undecidable manual S 123 65.6898 50 -0.41 64
TV.SF14.HHZ. 2021-09-30T12:56:02.14 0.3 undecidable manual S 130 64.2912 50 -0.45 64
GU.POPM.HHZ. 2021-09-30T12:56:01.21 0.3 undecidable manual P 349 103.5186 50 0.89 50
TV.SF04.EHZ. 2021-09-30T12:56:01.46 0.3 undecidable manual S 122 61.9935 50 -0.52 63
TV.SF11.HHZ. 2021-09-30T12:56:01.25 0.3 undecidable manual S 118 61.3941 50 -0.59 61
IV.CRE.HHZ. 2021-09-30T12:56:00.07 0.1 undecidable manual P 54 93.24 50 1.34 54
GU.MAIM.HHZ. 2021-09-30T12:55:59.68 0.3 undecidable manual P 334 96.4257 50 0.46 60
IV.MOCL.EHZ. 2021-09-30T12:55:59.60 0.6 undecidable manual P 8 98.0241 50 0.14 42
IV.BOSL.HHZ. 2021-09-30T12:55:59.83 0.6 undecidable manual P 18 93.5397 50 1.05 31
IV.RUFI.EHZ. 2021-09-30T12:55:58.18 0.6 undecidable manual P 27 88.1451 50 0.23 43
IV.ARCI.HHZ. 2021-09-30T12:55:58.12 0.3 undecidable manual S 129 48.618 50 -0.31 67
IV.OSSC.HHZ. 2021-09-30T12:55:57.76 0.3 undecidable manual S 23 47.619 50 -0.39 67
IV.CAFI.HHZ. 2021-09-30T12:55:57.02 0.1 undecidable manual P 74 80.2641 50 0.29 85
IV.CELB.HHZ. 2021-09-30T12:55:57.54 0.1 undecidable manual P 237 77.6667 50 1.2 60
IV.PII.HHZ. 2021-09-30T12:55:56.41 0.3 undecidable manual P 329 76.4679 50 0.26 65
IV.CSNT.HHZ. 2021-09-30T12:55:56.68 0.3 undecidable manual S 30 44.2224 50 -0.57 64
IV.CASP.HHZ. 2021-09-30T12:55:55.68 0.6 undecidable manual S 198 39.4272 50 -0.29 46
IV.MCIV.CHZ. 2021-09-30T12:55:55.01 0.3 undecidable manual P 126 66.5778 50 0.39 64
IV.CRMI.HHZ. 2021-09-30T12:55:55.89 0.3 undecidable manual P 358 73.8705 50 0.14 67
TV.SF04.EHZ. 2021-09-30T12:55:54.62 0.1 undecidable manual P 122 61.9935 50 0.71 78
TV.SF11.HHZ. 2021-09-30T12:55:54.07 0.1 undecidable manual P 118 61.3941 50 0.24 89
TV.SF03.EHZ. 2021-09-30T12:55:54.79 0.3 undecidable manual P 123 65.6898 50 0.31 65
TV.SF14.HHZ. 2021-09-30T12:55:54.77 0.6 undecidable manual P 130 64.2912 50 0.51 42
IV.MAGO.CHZ. 2021-09-30T12:55:53.02 0.3 undecidable manual S 299 32.745 50 -1.16 50
IV.ARCI.HHZ. 2021-09-30T12:55:52.18 0.1 undecidable manual P 129 48.618 50 0.32 90
IV.CSNT.HHZ. 2021-09-30T12:55:51.12 0.3 undecidable manual P 30 44.2224 50 -0.06 72
IV.OSSC.HHZ. 2021-09-30T12:55:51.63 0.3 undecidable manual P 23 47.619 50 -0.07 71
IV.RIBO.EHZ.01 2021-09-30T12:55:50.54 0.3 undecidable manual S 172 20.2686 118 -0.27 72
IV.CASP.HHZ. 2021-09-30T12:55:50.72 0.1 undecidable manual P 198 39.4272 50 0.28 92
IV.MAGO.CHZ. 2021-09-30T12:55:49.12 0.3 undecidable manual P 299 32.745 50 -0.28 70
IV.FROS.CHZ. 2021-09-30T12:55:48.56 0.3 undecidable manual S 53 14.6742 126 -0.6 66
IV.RIBO.EHZ.01 2021-09-30T12:55:47.62 0.1 undecidable manual P 172 20.2686 118 0.16 98
IV.TRIF.CHZ. 2021-09-30T12:55:47.06 0.3 undecidable manual S 259 8.9799 140 -0.64 66
IV.FROS.CHZ. 2021-09-30T12:55:46.36 0.1 positive manual P 53 14.6742 126 -0.14 99
IV.TRIF.CHZ. 2021-09-30T12:55:45.52 0.1 undecidable manual P 259 8.9799 140 -0.14 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.TRIF.CHN. ML:3.2 0.022 0.18 AML other m 2021-09-30T12:55:47.16
IV.TRIF.CHE. ML:3.2 0.02125 0.14 AML other m 2021-09-30T12:55:47.91
IV.FROS.CHN. ML:3.0 0.01056 0.4 AML other m 2021-09-30T12:55:48.73
IV.FROS.CHE. ML:2.7 0.005205 1.1 AML other m 2021-09-30T12:55:49.72
IV.CSNT.HHN. ML:2.2 0.00042300000000000004 1.84 AML other m 2021-09-30T12:55:56.94
IV.CSNT.HHE. ML:2.1 0.00040249999999999997 1.5 AML other m 2021-09-30T12:55:57.99
IV.ARCI.HHE. ML:2.1 0.0003305 0.54 AML other m 2021-09-30T12:55:58.59
IV.OSSC.HHE. ML:1.8 0.000179 0.9 AML other m 2021-09-30T12:55:58.48
IV.ARCI.HHN. ML:2.2 0.000388 0.44 AML other m 2021-09-30T12:55:59.19
IV.OSSC.HHN. ML:1.8 0.0001595 0.54 AML other m 2021-09-30T12:56:01.61
IV.MCIV.CHE. ML:1.9 0.0001325 0.18 AML other m 2021-09-30T12:56:02.74
IV.MCIV.CHN. ML:1.7 0.0000923 1.68 AML other m 2021-09-30T12:56:05.05
IV.CRMI.HHN. ML:1.5 0.000047149999999999994 0.5 AML other m 2021-09-30T12:56:06.46
IV.PII.HHN. ML:2.0 0.00016649999999999998 1.7 AML other m 2021-09-30T12:56:07.97
IV.PII.HHE. ML:2.0 0.0001465 0.24 AML other m 2021-09-30T12:56:07.81
IV.CRMI.HHE. ML:1.3 0.000030150000000000004 0.76 AML other m 2021-09-30T12:56:08.69
IV.CELB.HHE. ML:2.4 0.0003325 1.68 AML other m 2021-09-30T12:56:08.87
IV.CELB.HHN. ML:2.3 0.00026450000000000003 0.48 AML other m 2021-09-30T12:56:08.94
IV.CAFI.HHE. ML:1.5 0.0000393 0.74 AML other m 2021-09-30T12:56:09.80
IV.MOCL.EHE. ML:1.9 0.00008565000000000001 0.44 AML other m 2021-09-30T12:56:10.55
IV.MOCL.EHN. ML:1.9 0.00008175000000000001 0.42 AML other m 2021-09-30T12:56:10.96
IV.RUFI.EHE. ML:1.8 0.00007709499999999999 1.52 AML other m 2021-09-30T12:56:11.97
IV.CAFI.HHN. ML:1.5 0.00004125 0.82 AML other m 2021-09-30T12:56:12.93
IV.RUFI.EHN. ML:1.7 0.00006175 1.2 AML other m 2021-09-30T12:56:12.04
IV.CRE.HHN. ML:1.8 0.00007314999999999999 1.68 AML other m 2021-09-30T12:56:14.84
IV.BOSL.HHN. ML:1.6 0.00004015 0.42 AML other m 2021-09-30T12:56:14.38
IV.BOSL.HHE. ML:1.6 0.00004355 1.38 AML other m 2021-09-30T12:56:15.05
GU.POPM.HHN. ML:1.8 0.0000555 0.42 AML other m 2021-09-30T12:56:15.23
IV.CRE.HHE. ML:1.8 0.00007735 1.24 AML other m 2021-09-30T12:56:16.84
GU.POPM.HHE. ML:1.8 0.0000596 1.18 AML other m 2021-09-30T12:56:17.09
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