Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.9 on date 19-09-2021 and time 07:48:20 (UTC) in region 6 km S Montieri (GR)

A magnitude ML 1.9 earthquake occured in region: 6 km S Montieri (GR), on

  • 19-09-2021 07:48:20 (UTC)
  • 19-09-2021 09:48:20 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.0740, 11.0100 at 10 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 6 1204 1204
Massa Marittima GR 10 8375 9579
Chiusdino SI 11 1903 11482
Roccastrada GR 15 9199 20681
Monterotondo Marittimo GR 15 1371 22052
Monticiano SI 16 1571 23623
Castelnuovo di Val di Cecina PI 17 2231 25854
Gavorrano GR 19 8580 34434

Municipalities with at least 50000 inhabitants

An earthquake occurred to
36 Km N of Grosseto (82087 inhabitants)
38 Km SW of Siena (53903 inhabitants)
78 Km S of Scandicci (50609 inhabitants)
78 Km SE of Livorno (159219 inhabitants)
80 Km S of Firenze (382808 inhabitants)
83 Km SW of Arezzo (99543 inhabitants)
87 Km SE of Pisa (89158 inhabitants)
90 Km S of Prato (191150 inhabitants)
95 Km SE of Lucca (89046 inhabitants)
96 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 2021-09-19
07:48:20		 43.074 11.0097 10 2022-03-30
13:04:12		 Bollettino Sismico Italiano INGV 96764511
Reviewed
Rev100 		ML 1.9 2021-09-19
07:48:20		 43.0755 11.0127 10 2021-09-19
08:06:52		 Sala Sismica INGV-Roma 95624801
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-19 07:48:20 ± 0.09
Latitude 43.0740 ± 0.0045
Longitude 11.0097 ± 0.0074
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 96764511

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 460
Semi-minor axis of confidence ellipse (meter) 385
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 253
Circular confidence region, given by single value of horizontal uncertainty (meter) 460.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 57
Number of associated phases, regardless of their use for origin computation 40
Number of defining phases 40
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.36
Epicentral distance of station closest to the epicenter (degree) 0.08813
Epicentral distance of station farthest from the epicenter (degree) 0.95598
Number of stations at which the event was observed 23
Number of stations from which data was used for origin computation 23
Magnitudes information

ML:1.9

Field Value
Value 1.9
Uncertainty 0.4
Num. used stations 24
Type of magnitude ML
Reference to an origin 96764511
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-10-19 14:23:25

ML:1.9

Field Value
Value 1.9
Uncertainty 0.4
Num. used stations 25
Type of magnitude ML
Reference to an origin 95624801
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-19 08:06:52
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.RUFI.EHZ. 2021-09-19T07:48:48.21 0.3 undecidable manual S 25 93.8394 50 0.25 63
IV.CAFI.HHZ. 2021-09-19T07:48:44.39 1.0 undecidable manual S 70 82.3509 50 -0.52 20
IV.CRMI.HHZ. 2021-09-19T07:48:43.89 0.3 undecidable manual S 358 80.0643 50 -0.41 62
IV.CELB.HHZ. 2021-09-19T07:48:42.91 0.3 undecidable manual S 241 74.37 50 0.13 67
IV.MCIV.CHZ. 2021-09-19T07:48:39.80 0.6 undecidable manual S 121 63.2922 50 -0.02 47
TV.SF03.EHN. 2021-09-19T07:48:39.86 0.3 undecidable manual S 118 62.5929 50 0.23 67
TV.SF14.HHN. 2021-09-19T07:48:39.03 0.6 undecidable manual S 126 60.5949 50 -0.05 46
IV.SSP9.EHZ. 2021-09-19T07:48:38.96 0.3 undecidable manual P 58 106.116 50 0.87 50
TV.SF11.HHZ. 2021-09-19T07:48:38.57 0.3 undecidable manual S 113 58.8966 50 -0.07 70
TV.SF04.EHZ. 2021-09-19T07:48:38.64 1.0 undecidable manual S 116 59.0964 50 -0.05 23
IV.CRE.HHZ. 2021-09-19T07:48:37.42 0.1 undecidable manual P 51 97.125 50 0.73 72
IV.RUFI.EHZ. 2021-09-19T07:48:36.98 0.1 undecidable manual P 25 93.8394 50 0.79 71
IV.OSSC.HHZ. 2021-09-19T07:48:36.56 0.3 undecidable manual S 21 53.4021 50 -0.61 62
IV.CSNT.HHZ. 2021-09-19T07:48:35.40 0.3 undecidable manual S 27 49.7169 50 -0.79 57
IV.MGAB.HHZ. 2021-09-19T07:48:35.91 0.3 undecidable manual P 101 91.242 50 0.12 65
IV.PII.HHZ. 2021-09-19T07:48:34.64 0.1 undecidable manual P 332 81.7515 50 0.3 85
IV.SACS.HHE. 2021-09-19T07:48:34.52 0.1 undecidable manual P 109 77.1672 50 0.89 70
IV.CAFI.HHZ. 2021-09-19T07:48:34.57 0.1 undecidable manual P 70 82.3509 50 0.14 87
IV.CRMI.HHZ. 2021-09-19T07:48:34.72 0.1 undecidable manual P 358 80.0643 50 0.65 77
IV.FIR.HHZ. 2021-09-19T07:48:34.16 1.0 undecidable manual P 14 80.1642 50 0.08 22
IV.ARCI.HHZ. 2021-09-19T07:48:33.98 0.3 undecidable manual S 123 45.1215 50 -0.99 53
IV.CELB.HHZ. 2021-09-19T07:48:33.52 0.3 undecidable manual P 241 74.37 50 0.32 64
IV.MCIV.CHZ. 2021-09-19T07:48:31.51 0.1 undecidable manual P 121 63.2922 50 0.02 93
IV.CASP.HHZ. 2021-09-19T07:48:31.13 0.3 undecidable manual S 201 33.5442 50 -0.74 61
TV.SF03.EHN. 2021-09-19T07:48:31.37 0.1 undecidable manual P 118 62.5929 50 -0.01 93
IV.MAGO.CHN. 2021-09-19T07:48:31.74 0.3 undecidable manual S 308 36.0417 50 -0.8 59
TV.SF14.HHN. 2021-09-19T07:48:31.08 0.1 undecidable manual P 126 60.5949 50 0.02 94
TV.SF04.EHZ. 2021-09-19T07:48:30.81 0.1 undecidable manual P 116 59.0964 50 -0.03 94
TV.SF11.HHZ. 2021-09-19T07:48:30.71 0.1 undecidable manual P 113 58.8966 50 -0.1 92
IV.OSSC.HHZ. 2021-09-19T07:48:30.05 0.1 negative manual P 21 53.4021 50 0.09 93
IV.CSNT.HHZ. 2021-09-19T07:48:29.34 0.1 undecidable manual P 27 49.7169 50 -0.05 95
IV.ARCI.HHZ. 2021-09-19T07:48:28.47 0.1 undecidable manual P 123 45.1215 50 -0.21 92
IV.MAGO.CHN. 2021-09-19T07:48:27.25 0.1 undecidable manual P 308 36.0417 50 -0.03 98
IV.FROS.CHZ. 2021-09-19T07:48:26.74 0.3 undecidable manual S 38 19.1697 116 -0.78 61
IV.CASP.HHZ. 2021-09-19T07:48:26.89 0.1 undecidable manual P 201 33.5442 50 -0.01 98
IV.RIBO.EHZ.01 2021-09-19T07:48:25.76 0.3 undecidable manual S 168 14.1747 124 -0.26 72
IV.FROS.CHZ. 2021-09-19T07:48:24.18 0.1 undecidable manual P 38 19.1697 116 -0.21 97
IV.TRIF.CHZ. 2021-09-19T07:48:24.62 0.3 undecidable manual S 298 9.7791 134 -0.21 74
IV.TRIF.CHZ. 2021-09-19T07:48:23.05 0.1 undecidable manual P 298 9.7791 134 0.22 98
IV.RIBO.EHZ.01 2021-09-19T07:48:23.62 0.1 undecidable manual P 168 14.1747 124 0.1 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.RIBO.EHE.01 ML:2.6 0.003768337 0.1792 AML other m 2021-09-19T07:48:25.95
IV.TRIF.CHE. ML:2.4 0.0034881244999999997 0.2112 AML other m 2021-09-19T07:48:25.97
IV.TRIF.CHN. ML:2.4 0.003462473 0.2368 AML other m 2021-09-19T07:48:26.44
IV.FROS.CHN. ML:2.5 0.002500267 1.7888 AML other m 2021-09-19T07:48:27.97
IV.FROS.CHE. ML:2.4 0.001862981 0.224 AML other m 2021-09-19T07:48:27.62
IV.CASP.HHE. ML:2.0 0.0004652558 0.16 AML other m 2021-09-19T07:48:31.31
IV.CASP.HNE. ML:2.0 0.0004376037 0.1472 AML other m 2021-09-19T07:48:31.31
IV.CASP.HHN. ML:2.0 0.0004215 0.3 AML other m 2021-09-19T07:48:31.29
IV.CASP.HNN. ML:1.9 0.00035764790000000004 0.16 AML other m 2021-09-19T07:48:31.29
IV.ARCI.HHE. ML:1.7 0.00014477128 0.1408 AML other m 2021-09-19T07:48:34.49
IV.ARCI.HNE. ML:1.6 0.000131573095 0.1408 AML other m 2021-09-19T07:48:34.49
IV.ARCI.HHN. ML:1.6 0.000131 1.1 AML other m 2021-09-19T07:48:34.27
IV.CSNT.HHN. ML:1.4 0.000061025424999999995 0.2048 AML other m 2021-09-19T07:48:35.57
IV.ARCI.HNN. ML:1.6 0.000126871345 0.2304 AML other m 2021-09-19T07:48:35.76
IV.OSSC.HHE. ML:1.4 0.000057576475000000005 0.16 AML other m 2021-09-19T07:48:36.81
IV.CSNT.HHE. ML:1.3 0.00005188717 0.16 AML other m 2021-09-19T07:48:37.46
IV.MCIV.CHN. ML:1.9 0.00014900000000000002 0.2 AML other m 2021-09-19T07:48:40.40
TV.SF04.EHN. ML:2.3 0.00044578825 0.2176 AML other m 2021-09-19T07:48:40.64
IV.OSSC.HHN. ML:1.4 0.00006201481000000001 1.0752 AML other m 2021-09-19T07:48:37.42
IV.MCIV.CHE. ML:1.8 0.0001126 0.2 AML other m 2021-09-19T07:48:41.40
IV.CELB.HHN. ML:2.1 0.00020843375000000004 0.1216 AML other m 2021-09-19T07:48:45.40
IV.CELB.HHE. ML:2.2 0.00025625549999999995 0.0768 AML other m 2021-09-19T07:48:46.14
IV.CAFI.HHE. ML:1.3 0.00002685 0.64 AML other m 2021-09-19T07:48:49.64
IV.CAFI.HHN. ML:1.2 0.000020249999999999998 0.54 AML other m 2021-09-19T07:48:49.54
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