Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 01-02-2023 and time 22:47:46 (Italy) in region 2 km E Montieri (GR)

A magnitude ML 1.4 earthquake occured in region: 2 km E Montieri (GR), on

  • 01-02-2023 21:47:46 (UTC)
  • 01-02-2023 22:47:46 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.1360, 11.0450 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 2 1204 1204
Chiusdino SI 4 1903 3107
Monticiano SI 11 1571 4678
Castelnuovo di Val di Cecina PI 14 2231 6909
Radicondoli SI 14 914 7823
Monterotondo Marittimo GR 15 1371 9194
Massa Marittima GR 16 8375 17569
Roccastrada GR 17 9199 26768

Municipalities with at least 50000 inhabitants

An earthquake occurred to
31 Km SW of Siena (53903 inhabitants)
42 Km N of Grosseto (82087 inhabitants)
70 Km S of Scandicci (50609 inhabitants)
73 Km S of Firenze (382808 inhabitants)
75 Km SE of Livorno (159219 inhabitants)
77 Km W of Arezzo (99543 inhabitants)
83 Km SE of Pisa (89158 inhabitants)
83 Km S of Prato (191150 inhabitants)
89 Km S of Pistoia (90315 inhabitants)
90 Km SE of Lucca (89046 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 1.4 2023-02-01
21:47:46		 43.1362 11.0447 9 2024-03-01
17:18:11		 Bollettino Sismico Italiano INGV 118234141
Reviewed
Rev100 		ML 1.5 2023-02-01
21:47:46		 43.1253 11.0388 9 2023-02-01
21:58:16		 Sala Sismica INGV-Roma 113965831
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-02-01 21:47:46 ± 0.09
Latitude 43.1362 ± 0.0054
Longitude 11.0447 ± 0.0074
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 118234141

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 551
Semi-minor axis of confidence ellipse (meter) 514
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 309
Circular confidence region, given by single value of horizontal uncertainty (meter) 550.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 69
Number of associated phases, regardless of their use for origin computation 21
Number of defining phases 21
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.28
Epicentral distance of station closest to the epicenter (degree) 0.10612
Epicentral distance of station farthest from the epicenter (degree) 0.72395
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:1.4

Field Value
Value 1.4
Uncertainty 0.3
Num. used stations 14
Type of magnitude ML
Reference to an origin 118234141
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2023-06-09 06:53:14

ML:1.5

Field Value
Value 1.5
Uncertainty 0.4
Num. used stations 18
Type of magnitude ML
Reference to an origin 113965831
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-02-01 21:58:16
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.OSSC.HHZ. 2023-02-01T21:48:01.10 0.3 undecidable manual S 21 45.9207 50 -0.44 66
IV.CELB.HHZ. 2023-02-01T21:48:01.33 0.3 undecidable manual P 238 80.364 50 0.88 52
IV.ARCI.HHZ. 2023-02-01T21:48:01.70 0.3 undecidable manual S 132 47.0196 50 -0.13 70
IV.CSNT.HHZ. 2023-02-01T21:48:00.20 0.6 undecidable manual S 28 42.3243 50 -0.36 45
IV.PII.HHZ. 2023-02-01T21:48:00.07 0.1 undecidable manual P 327 77.2671 50 0.09 89
IV.CRMI.HNE. 2023-02-01T21:47:59.72 1.0 undecidable manual P 356 73.371 50 0.35 21
IV.MALA0.EHZ. 2023-02-01T21:47:59.20 0.3 undecidable manual S 112 37.629 50 -0.12 72
IV.CASP.HHZ. 2023-02-01T21:47:59.75 0.3 undecidable manual S 201 41.0256 50 -0.46 66
IV.MALA5.EHZ. 2023-02-01T21:47:59.10 0.3 undecidable manual S 112 37.9287 50 -0.29 69
IV.MALA1.EHZ. 2023-02-01T21:47:59.20 0.6 undecidable manual S 113 37.9287 50 -0.2 47
IV.ARCI.HHZ. 2023-02-01T21:47:55.59 0.3 undecidable manual P 132 47.0196 50 0.28 68
IV.OSSC.HHZ. 2023-02-01T21:47:55.27 0.1 undecidable manual P 21 45.9207 50 0.13 94
IV.CSNT.HHZ. 2023-02-01T21:47:54.69 0.3 undecidable manual P 28 42.3243 50 0.1 71
IV.MALA0.EHZ. 2023-02-01T21:47:54.24 0.6 undecidable manual P 112 37.629 50 0.38 45
IV.CASP.HHZ. 2023-02-01T21:47:54.57 0.3 undecidable manual P 201 41.0256 50 0.19 70
IV.MALA1.EHZ. 2023-02-01T21:47:54.27 0.3 undecidable manual P 113 37.9287 50 0.36 68
IV.MALA5.EHZ. 2023-02-01T21:47:53.91 1.0 undecidable manual P 112 37.9287 50 0 24
IV.TRIF.CHZ. 2023-02-01T21:47:51.13 0.3 undecidable manual S 258 11.7771 128 -0.47 70
IV.FROS.CHZ. 2023-02-01T21:47:51.60 0.3 undecidable manual S 48 12.1767 127 -0.12 75
IV.FROS.CHZ. 2023-02-01T21:47:49.72 0.1 negative manual P 48 12.1767 127 0.24 98
IV.TRIF.CHZ. 2023-02-01T21:47:49.29 0.1 undecidable manual P 258 11.7771 128 -0.12 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CASP.HNE. ML:1.9 0.0002537004 0.1792 AML other m 2023-02-01T21:47:59.71
IV.CASP.HHN. ML:1.8 0.000194396495 0.0512 AML other m 2023-02-01T21:47:59.76
IV.CASP.HNN. ML:1.9 0.0002517022 1.8592 AML other m 2023-02-01T21:48:00.99
IV.CASP.HHE. ML:1.8 0.0001905485 0.1664 AML other m 2023-02-01T21:48:00.06
IV.CSNT.HHN. ML:1.4 0.00007539999999999999 0.16 AML other m 2023-02-01T21:48:00.67
IV.CSNT.HHE. ML:1.1 0.0000411536323 0.192 AML other m 2023-02-01T21:48:00.88
IV.OSSC.HHE. ML:1.2 0.00004813011 0.192 AML other m 2023-02-01T21:48:02.20
IV.ARCI.HNN. ML:1.2 0.000051883275 0.1024 AML other m 2023-02-01T21:48:02.46
IV.ARCI.HHN. ML:1.3 0.000056414525 0.1152 AML other m 2023-02-01T21:48:02.47
IV.ARCI.HHE. ML:1.1 0.000034837325 0.1024 AML other m 2023-02-01T21:48:02.60
IV.OSSC.HHN. ML:1.0 0.000030566495 1.7056 AML other m 2023-02-01T21:48:03.92
IV.ARCI.HNE. ML:1.2 0.00004420936 0.384 AML other m 2023-02-01T21:48:05.08
IV.CELB.HHN. ML:1.4 0.000036659435000000006 0.0768 AML other m 2023-02-01T21:48:12.92
IV.CELB.HHE. ML:1.7 0.00006781962999999999 0.0512 AML other m 2023-02-01T21:48:14.14
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