Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.2 on date 25-04-2021 and time 13:15:29 (Italy) in region 1 km NE Montieri (GR)

A magnitude ML 1.2 earthquake occured in region: 1 km NE Montieri (GR), on

  • 25-04-2021 11:15:29 (UTC)
  • 25-04-2021 13:15:29 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.1400, 11.0300 at 10 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.

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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 1 1204 1204
Chiusdino SI 5 1903 3107
Monticiano SI 12 1571 4678
Castelnuovo di Val di Cecina PI 13 2231 6909
Radicondoli SI 14 914 7823
Monterotondo Marittimo GR 14 1371 9194
Massa Marittima GR 15 8375 17569
Roccastrada GR 18 9199 26768

Municipalities with at least 50000 inhabitants

An earthquake occurred to
32 Km SW of Siena (53903 inhabitants)
43 Km N of Grosseto (82087 inhabitants)
70 Km S of Scandicci (50609 inhabitants)
72 Km S of Firenze (382808 inhabitants)
74 Km SE of Livorno (159219 inhabitants)
78 Km W of Arezzo (99543 inhabitants)
82 Km SE of Pisa (89158 inhabitants)
83 Km S of Prato (191150 inhabitants)
89 Km S of Pistoia (90315 inhabitants)
89 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
Reviewed
Rev100 		ML 1.2 2021-04-25
11:15:29		 43.1398 11.0303 10 2021-04-25
11:36:15		 Sala Sismica INGV-Roma 89464251
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-25 11:15:29 ± 0.18
Latitude 43.1398 ± 0.0126
Longitude 11.0303 ± 0.0246
Depth (km) 10 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 89464251

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 2211
Semi-minor axis of confidence ellipse (meter) 920
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 240
Circular confidence region, given by single value of horizontal uncertainty (meter) 2210.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 94
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) 0.37
Epicentral distance of station closest to the epicenter (degree) 0.09623
Epicentral distance of station farthest from the epicenter (degree) 0.55218
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitude information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.5
Num. used stations 8
Type of magnitude ML
Reference to an origin 89464251
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-25 11:36:15
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
TV.SF01.EHZ. 2021-04-25T11:15:47.75 1.0 undecidable manual S 130 56.499 50 0.58 21
IV.ARCI.HHZ. 2021-04-25T11:15:44.13 0.3 undecidable manual S 131 48.2184 50 -0.82 58
IV.CSNT.HHZ. 2021-04-25T11:15:42.94 0.3 undecidable manual S 29 42.5241 50 -0.49 67
TV.SF04.EHZ. 2021-04-25T11:15:40.80 0.3 undecidable manual P 123 61.2942 50 0.46 65
TV.SF01.EHZ. 2021-04-25T11:15:39.96 0.3 undecidable manual P 130 56.499 50 0.35 67
IV.ARCI.HHZ. 2021-04-25T11:15:38.57 0.3 undecidable manual P 131 48.2184 50 0.24 70
IV.CSNT.HHZ. 2021-04-25T11:15:37.58 0.3 undecidable manual P 29 42.5241 50 0.13 73
IV.MAGO.CHZ. 2021-04-25T11:15:36.07 0.3 undecidable manual P 296 33.5442 50 0 76
IV.RIBO.EHZ.01 2021-04-25T11:15:36.96 0.3 undecidable manual S 176 21.1677 114 -0.4 71
IV.RIBO.EHZ.01 2021-04-25T11:15:34.18 0.3 undecidable manual P 176 21.1677 114 0.23 74
IV.TRIF.CHZ. 2021-04-25T11:15:33.96 0.3 undecidable manual S 255 10.6782 132 -0.31 74
IV.TRIF.CHZ. 2021-04-25T11:15:32.40 0.1 undecidable manual P 255 10.6782 132 0.23 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.TRIF.CHN. ML:2.2 0.002005 0.1 AML other m 2021-04-25T11:15:34.11
IV.TRIF.CHE. ML:2.1 0.0015300000000000001 0.28 AML other m 2021-04-25T11:15:34.08
IV.MAGO.CHE. ML:1.0 0.0000429 0.66 AML other m 2021-04-25T11:15:37.49
IV.ARCI.HHN. ML:0.6 0.00001185 0.94 AML other m 2021-04-25T11:15:40.44
IV.ARCI.HHE. ML:0.7 0.00001715 0.92 AML other m 2021-04-25T11:15:44.20
IV.RIBO.EHE.01 ML:1.5 0.00023690745000000003 0.1792 AML other m 2021-04-25T11:15:37.12
TV.SF01.EHE. ML:1.2 0.00003265329065 0.1792 AML other m 2021-04-25T11:15:48.04
TV.SF01.EHN. ML:1.2 0.000033190298 0.1792 AML other m 2021-04-25T11:15:48.05
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