Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.4 on date 27-09-2021 and time 14:58:14 (UTC) in region 7 km S Montieri (GR)

A magnitude ML 2.4 earthquake occured in region: 7 km S Montieri (GR), on

  • 27-09-2021 14:58:14 (UTC)
  • 27-09-2021 16:58:14 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.0720, 11.0180 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 7 1204 1204
Massa Marittima GR 11 8375 9579
Chiusdino SI 11 1903 11482
Roccastrada GR 14 9199 20681
Monticiano SI 15 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)
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)
96 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 2.4 2021-09-27
14:58:14		 43.0722 11.0177 10 2022-03-30
13:04:13		 Bollettino Sismico Italiano INGV 96975721
Reviewed
Rev100 		ML 2.2 2021-09-27
14:58:14		 43.0732 11.0232 10 2021-09-27
15:04:41		 Sala Sismica INGV-Roma 95950031
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-27 14:58:14 ± 0.09
Latitude 43.0722 ± 0.0045
Longitude 11.0177 ± 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 96975721

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 583
Semi-minor axis of confidence ellipse (meter) 155
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 272
Circular confidence region, given by single value of horizontal uncertainty (meter) 580.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 56
Number of associated phases, regardless of their use for origin computation 23
Number of defining phases 23
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.31
Epicentral distance of station closest to the epicenter (degree) 0.09443
Epicentral distance of station farthest from the epicenter (degree) 0.74104
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 12
Magnitudes information

ML:2.4

Field Value
Value 2.4
Uncertainty 0.3
Num. used stations 22
Type of magnitude ML
Reference to an origin 96975721
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-10-25 09:03:00

ML:2.2

Field Value
Value 2.2
Uncertainty 0.5
Num. used stations 36
Type of magnitude ML
Reference to an origin 95950031
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-27 15:04:41
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CAFI.HHZ. 2021-09-27T14:58:39.05 0.6 undecidable manual S 69 81.8514 50 0.01 45
IV.PII.HHZ. 2021-09-27T14:58:39.03 0.6 undecidable manual S 331 82.251 50 -0.14 44
IV.CRMI.HHZ. 2021-09-27T14:58:38.50 0.6 undecidable manual S 358 80.364 50 -0.14 44
IV.CELB.HHZ. 2021-09-27T14:58:37.25 0.6 undecidable manual S 241 74.8695 50 0.07 45
IV.OSSC.HHZ. 2021-09-27T14:58:31.20 0.3 undecidable manual S 20 53.4021 50 -0.24 68
IV.PII.HHZ. 2021-09-27T14:58:29.31 0.6 undecidable manual P 331 82.251 50 0.6 39
IV.CAFI.HHZ. 2021-09-27T14:58:29.14 0.3 undecidable manual P 69 81.8514 50 0.5 61
IV.ARCI.HHZ. 2021-09-27T14:58:28.23 0.3 undecidable manual S 123 44.4222 50 -0.84 57
IV.CRMI.HHZ. 2021-09-27T14:58:28.87 0.3 undecidable manual P 358 80.364 50 0.46 61
IV.CELB.HHZ. 2021-09-27T14:58:28.15 0.6 undecidable manual P 241 74.8695 50 0.58 40
IV.MAGO.CHZ. 2021-09-27T14:58:26.16 0.6 undecidable manual S 308 36.6411 50 -0.83 39
IV.CASP.HHZ. 2021-09-27T14:58:25.63 0.3 undecidable manual S 202 33.5442 50 -0.53 66
TV.SF04.EHZ. 2021-09-27T14:58:25.33 0.1 undecidable manual P 116 58.3971 50 0.3 88
IV.OSSC.HHZ. 2021-09-27T14:58:24.46 0.1 undecidable manual P 20 53.4021 50 0.21 91
IV.ARCI.HHZ. 2021-09-27T14:58:23.02 0.1 undecidable manual P 123 44.4222 50 0.14 94
IV.CASP.HHZ. 2021-09-27T14:58:21.26 0.1 positive manual P 202 33.5442 50 0.06 97
IV.MAGO.CHZ. 2021-09-27T14:58:21.73 0.1 undecidable manual P 308 36.6411 50 0.05 97
IV.FROS.CHZ. 2021-09-27T14:58:21.37 0.3 undecidable manual S 36 18.9699 117 -0.45 69
IV.RIBO.EHZ. 2021-09-27T14:58:20.07 0.6 undecidable manual S 170 13.875 125 -0.23 48
IV.TRIF.CHZ. 2021-09-27T14:58:19.06 0.3 undecidable manual S 297 10.4784 133 -0.32 72
IV.RIBO.EHZ. 2021-09-27T14:58:18.01 0.1 undecidable manual P 170 13.875 125 0.19 98
IV.FROS.CHZ. 2021-09-27T14:58:18.66 0.1 negative manual P 36 18.9699 117 -0.04 100
IV.TRIF.CHZ. 2021-09-27T14:58:17.45 0.1 positive manual P 297 10.4784 133 0.16 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.TRIF.CHE. ML:2.5 0.0039972985 0.0512 AML other m 2021-09-27T14:58:19.35
IV.TRIF.CHN. ML:2.4 0.002924696 0.0768 AML other m 2021-09-27T14:58:19.95
IV.FROS.CHE. ML:2.8 0.00588725 0.1792 AML other m 2021-09-27T14:58:21.47
IV.FROS.CHN. ML:3.1 0.0091983475 0.2048 AML other m 2021-09-27T14:58:21.47
IV.CASP.HHE. ML:2.8 0.002401835 0.2688 AML other m 2021-09-27T14:58:25.80
IV.CASP.HNE. ML:2.6 0.0017349999999999998 0.26 AML other m 2021-09-27T14:58:25.95
IV.CASP.HHN. ML:2.7 0.0021023580000000004 0.1664 AML other m 2021-09-27T14:58:25.91
IV.CASP.HNN. ML:2.7 0.0021700110000000003 0.192 AML other m 2021-09-27T14:58:25.78
IV.MAGO.CHN. ML:2.5 0.0011575 0.1 AML other m 2021-09-27T14:58:26.19
IV.MAGO.CHE. ML:2.1 0.0005235 0.82 AML other m 2021-09-27T14:58:26.22
IV.ARCI.HHN. ML:2.4 0.0007975000000000001 0.22 AML other m 2021-09-27T14:58:28.41
IV.ARCI.HNN. ML:2.4 0.0007700000000000001 0.22 AML other m 2021-09-27T14:58:28.41
IV.ARCI.HNE. ML:2.3 0.000686 1.5 AML other m 2021-09-27T14:58:28.16
IV.ARCI.HHE. ML:2.4 0.0007170000000000001 1.5 AML other m 2021-09-27T14:58:28.16
IV.OSSC.HHE. ML:2.1 0.000304 0.52 AML other m 2021-09-27T14:58:31.73
IV.OSSC.HHN. ML:2.0 0.0002195 0.86 AML other m 2021-09-27T14:58:32.63
IV.CELB.HHE. ML:2.7 0.000837 0.38 AML other m 2021-09-27T14:58:39.47
IV.CELB.HHN. ML:2.5 0.0004465 0.22 AML other m 2021-09-27T14:58:39.73
IV.PII.HHN. ML:1.7 0.0000724 0.38 AML other m 2021-09-27T14:58:40.86
IV.PII.HHE. ML:1.9 0.00010899999999999999 1.62 AML other m 2021-09-27T14:58:40.81
IV.CRMI.HHE. ML:1.3 0.0000239309505 0.2432 AML other m 2021-09-27T14:58:42.32
IV.CRMI.HNE. ML:1.8 0.00009682203 0.512 AML other m 2021-09-27T14:58:42.07
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
Waveforms Seismic signals in miniseed + resp format Download