Earthquake with magnitude of ML 1.2 on date 04-12-2023 and time 20:13:17 (UTC) in region 6 km N Montieri (GR)

A magnitude ML 1.2 earthquake occured in region: 6 km N Montieri (GR), on

  • 04-12-2023 20:13:17 (UTC)
  • 04-12-2023 21:13:17 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.1840, 11.0000 at 9 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

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.

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
Chiusdino SI 8 1903 3107
Castelnuovo di Val di Cecina PI 8 2231 5338
Radicondoli SI 9 914 6252
Monterotondo Marittimo GR 12 1371 7623
Monticiano SI 15 1571 9194
Pomarance PI 17 5897 15091
Massa Marittima GR 17 8375 23466
Casole d'Elsa SI 18 3897 27363

Municipalities with at least 50000 inhabitants

An earthquake occurred to
31 Km W of Siena (53903 inhabitants)
48 Km N of Grosseto (82087 inhabitants)
66 Km S of Scandicci (50609 inhabitants)
68 Km SW of Firenze (382808 inhabitants)
69 Km SE of Livorno (159219 inhabitants)
76 Km SE of Pisa (89158 inhabitants)
78 Km S of Prato (191150 inhabitants)
78 Km W of Arezzo (99543 inhabitants)
84 Km S of Pistoia (90315 inhabitants)
84 Km SE of Lucca (89046 inhabitants)
97 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
Reviewed
Rev100
ML 1.2 2023-12-04
20:13:17
43.1838 11.0002 9 2023-12-04
21:07:15
Sala Sismica INGV-Roma 123815631
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-12-04 20:13:17 ± 0.11
Latitude 43.1838 ± 0.0072
Longitude 11.0002 ± 0.0123
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 123815631

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1144
Semi-minor axis of confidence ellipse (meter) 276
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 127
Circular confidence region, given by single value of horizontal uncertainty (meter) 1140.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 133
Number of associated phases, regardless of their use for origin computation 15
Number of defining phases 15
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.3
Epicentral distance of station closest to the epicenter (degree) 0.09893
Epicentral distance of station farthest from the epicenter (degree) 0.61154
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitude information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 123815631
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-12-04 21:07:15
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CASP.HHZ. 2023-12-04T20:13:31.69 0.3 undecidable manual S 194 44.9217 50 -0.43 66
IV.OSSC.HHZ. 2023-12-04T20:13:31.16 0.6 undecidable manual S 28 42.5241 50 -0.32 45
IV.CSNT.HHE. 2023-12-04T20:13:30.19 0.6 undecidable manual S 36 39.7269 50 -0.52 43
IV.CRMI.HHN. 2023-12-04T20:13:29.73 0.1 undecidable manual P 359 67.8765 50 0.38 85
IV.LOCA.HNZ. 2023-12-04T20:13:26.10 0.3 undecidable manual S 57 25.1526 110 -0.4 69
IV.CASP.HHZ. 2023-12-04T20:13:26.41 0.3 undecidable manual P 194 44.9217 50 0.59 63
IV.RIBO.EHZ.01 2023-12-04T20:13:26.84 0.6 undecidable manual S 172 26.3514 109 -0.04 49
IV.OSSC.HHZ. 2023-12-04T20:13:25.38 0.1 undecidable manual P 28 42.5241 50 -0.07 95
IV.CSNT.HHE. 2023-12-04T20:13:25.16 0.3 undecidable manual P 36 39.7269 50 0.15 71
IV.FROS.CHZ. 2023-12-04T20:13:22.74 0.3 undecidable manual S 77 12.9759 125 0.03 76
IV.LOCA.HNZ. 2023-12-04T20:13:22.75 0.3 undecidable manual P 57 25.1526 110 0.17 72
IV.RIBO.EHZ.01 2023-12-04T20:13:22.94 0.1 undecidable manual P 172 26.3514 109 0.14 97
IV.TRIF.CHZ. 2023-12-04T20:13:21.66 0.3 undecidable manual S 226 10.9779 130 -0.52 68
IV.TRIF.CHZ. 2023-12-04T20:13:20.18 0.1 positive manual P 226 10.9779 130 0.1 100
IV.FROS.CHZ. 2023-12-04T20:13:20.63 0.1 undecidable manual P 77 12.9759 125 0.24 97
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.TRIF.CHN. ML:1.3 0.0002525 0.1 AML other m 2023-12-04T20:13:21.97
IV.TRIF.CHE. ML:1.1 0.00016671615000000002 0.7296 AML other m 2023-12-04T20:13:21.67
IV.FROS.CHE. ML:1.3 0.00023300000000000003 1.34 AML other m 2023-12-04T20:13:23.75
IV.FROS.CHN. ML:1.6 0.0003995 1.12 AML other m 2023-12-04T20:13:23.03
IV.RIBO.EHE.01 ML:1.2 0.0000905938 2.1248 AML other m 2023-12-04T20:13:27.67
IV.RIBO.EHN.01 ML:1.2 0.00008246195000000001 0.1408 AML other m 2023-12-04T20:13:26.92
IV.CASP.HHE. ML:1.1 0.00003364324 0.6912 AML other m 2023-12-04T20:13:31.91
IV.CASP.HHN. ML:1.2 0.000043168735 0.5888 AML other m 2023-12-04T20:13:32.06
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