Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.8 on date 26-02-2022 and time 12:00:24 (UTC) in region 6 km W Montieri (GR)

A magnitude ML 1.8 earthquake occured in region: 6 km W Montieri (GR), on

  • 26-02-2022 12:00:24 (UTC)
  • 26-02-2022 13:00:24 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.1380, 10.9390 at 9 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
Monterotondo Marittimo GR 7 1371 2575
Castelnuovo di Val di Cecina PI 8 2231 4806
Massa Marittima GR 10 8375 13181
Chiusdino SI 12 1903 15084
Radicondoli SI 16 914 15998
Monteverdi Marittimo PI 19 758 16756
Pomarance PI 19 5897 22653
Monticiano SI 20 1571 24224

Municipalities with at least 50000 inhabitants

An earthquake occurred to
38 Km SW of Siena (53903 inhabitants)
44 Km NW of Grosseto (82087 inhabitants)
69 Km SE of Livorno (159219 inhabitants)
72 Km S of Scandicci (50609 inhabitants)
75 Km SW of Firenze (382808 inhabitants)
78 Km SE of Pisa (89158 inhabitants)
84 Km S of Prato (191150 inhabitants)
85 Km W of Arezzo (99543 inhabitants)
86 Km SE of Lucca (89046 inhabitants)
89 Km S of Pistoia (90315 inhabitants)
98 Km SE of Viareggio (62467 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 1.8 2022-02-26
12:00:24		 43.1377 10.939 9 2022-07-08
12:33:35		 Bollettino Sismico Italiano INGV 101851131
Reviewed
Rev100 		ML 1.8 2022-02-26
12:00:24		 43.1402 10.9362 10 2022-02-26
12:07:11		 Sala Sismica INGV-Roma 101469151
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2022-02-26 12:00:24 ± 0.14
Latitude 43.1377 ± 0.0090
Longitude 10.9390 ± 0.0173
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 101851131

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1545
Semi-minor axis of confidence ellipse (meter) 667
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 301
Circular confidence region, given by single value of horizontal uncertainty (meter) 1540.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 161
Number of associated phases, regardless of their use for origin computation 12
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.32
Epicentral distance of station closest to the epicenter (degree) 0.03507
Epicentral distance of station farthest from the epicenter (degree) 0.48473
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitudes information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 9
Type of magnitude ML
Reference to an origin 101851131
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-05-24 12:30:32

ML:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 9
Type of magnitude ML
Reference to an origin 101469151
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2022-02-26 12:07:11
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.OSSC.HHZ. 2022-02-26T12:00:40.04 0.6 undecidable manual S 30 49.4172 50 -0.28 45
IV.ARCI.HNZ. 2022-02-26T12:00:40.96 1.0 undecidable manual S 126 53.8017 50 -0.52 21
IV.CSNT.HHZ. 2022-02-26T12:00:39.09 0.6 undecidable manual S 37 46.8198 50 -0.51 43
IV.CASP.HHZ. 2022-02-26T12:00:36.89 0.6 undecidable manual S 189 38.9277 50 -0.62 42
IV.ARCI.HNZ. 2022-02-26T12:00:34.58 0.1 undecidable manual P 126 53.8017 50 0.37 88
IV.CSNT.HHZ. 2022-02-26T12:00:33.26 0.1 undecidable manual P 37 46.8198 50 0.14 94
IV.OSSC.HHZ. 2022-02-26T12:00:33.67 0.1 undecidable manual P 30 49.4172 50 0.14 93
IV.CASP.HHZ. 2022-02-26T12:00:32.08 0.1 undecidable manual P 189 38.9277 50 0.17 95
IV.FROS.CHZ. 2022-02-26T12:00:31.32 0.6 undecidable manual S 65 19.2696 116 -0.38 47
IV.FROS.CHZ. 2022-02-26T12:00:28.80 0.1 negative manual P 65 19.2696 116 0.25 97
IV.TRIF.CHZ. 2022-02-26T12:00:27.35 0.3 undecidable manual S 229 3.8961 157 -0.41 72
IV.TRIF.CHZ. 2022-02-26T12:00:26.48 0.1 positive manual P 229 3.8961 157 0.2 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.TRIF.CHE. ML:2.3 0.0035150000000000003 0.1 AML other m 2022-02-26T12:00:27.80
IV.TRIF.CHN. ML:2.2 0.0030700000000000002 0.34 AML other m 2022-02-26T12:00:28.55
IV.FROS.CHE. ML:1.8 0.00055 0.24 AML other m 2022-02-26T12:00:31.56
IV.FROS.CHN. ML:2.1 0.0009905 0.4 AML other m 2022-02-26T12:00:32.72
IV.CASP.HHE. ML:1.6 0.0001495 0.78 AML other m 2022-02-26T12:00:37.60
IV.CASP.HHN. ML:1.5 0.000124 0.14 AML other m 2022-02-26T12:00:37.16
IV.CASP.HNE. ML:1.7 0.0001787708 0.5312 AML other m 2022-02-26T12:00:37.40
IV.CASP.HNN. ML:1.6 0.00013849408999999999 1.6704 AML other m 2022-02-26T12:00:37.15
IV.CSNT.HHE. ML:0.9 0.000022588432 0.0768 AML other m 2022-02-26T12:00:39.71
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