Earthquake with magnitude of ML 1.1 on date 21-02-2024 and time 01:43:08 (UTC) in region 1 km W Onano (VT)

A magnitude ML 1.1 earthquake occured in region: 1 km W Onano (VT), on

  • 21-02-2024 01:43:08 (UTC)
  • 21-02-2024 02:43:08 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.6980, 11.8010 at 7 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
Onano VT 1 995 995
Grotte di Castro VT 6 2683 3678
Proceno VT 7 557 4235
Sorano GR 7 3428 7663
Gradoli VT 8 1353 9016
Acquapendente VT 8 5506 14522
Latera VT 8 836 15358
San Lorenzo Nuovo VT 9 2091 17449
Castell'Azzara GR 12 1476 18925
Pitigliano GR 13 3818 22743
Valentano VT 14 2868 25611
Castel Giorgio TR 15 2131 27742
Bolsena VT 16 3991 31733
Ischia di Castro VT 17 2326 34059
Farnese VT 17 1527 35586
Castel Viscardo TR 18 2938 38524
Capodimonte VT 19 1731 40255
Allerona TR 19 1794 42049
Piancastagnaio SI 19 4230 46279
Piansano VT 20 2079 48358

Municipalities with at least 50000 inhabitants

An earthquake occurred to
40 Km NW of Viterbo (67173 inhabitants)
57 Km E of Grosseto (82087 inhabitants)
66 Km SW of Perugia (166134 inhabitants)
67 Km N of Civitavecchia (52991 inhabitants)
71 Km W of Terni (111501 inhabitants)
79 Km SE of Siena (53903 inhabitants)
79 Km W of Foligno (57155 inhabitants)
86 Km S of Arezzo (99543 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 1.1 2024-02-21
01:43:08
42.6978 11.8012 7 2024-02-21
01:47:20
Sala Sismica INGV-Roma 125411631
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2024-02-21 01:43:08 ± 0.22
Latitude 42.6978 ± 0.0036
Longitude 11.8012 ± 0.0073
Depth (km) 7 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 125411631

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 600
Semi-minor axis of confidence ellipse (meter) 242
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 81
Circular confidence region, given by single value of horizontal uncertainty (meter) 600.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 151
Number of associated phases, regardless of their use for origin computation 10
Number of defining phases 9
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.18
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.28419
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 5
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.3
Num. used stations 6
Type of magnitude ML
Reference to an origin 125411631
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2024-02-21 01:47:20
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.FDMO.HHZ. 2024-02-21T01:43:17.51 3.0 positive manual P 0.01 0
TV.SF11.HHE. 2024-02-21T01:43:15.95 0.3 undecidable manual S 332 21.3675 108 -0.3 70
IV.SACS.HHZ. 2024-02-21T01:43:15.52 0.3 undecidable manual S 28 18.9699 110 0.07 74
IV.ARCI.HHZ. 2024-02-21T01:43:14.79 0.3 undecidable manual P 303 31.5462 102 -0.14 71
IV.MCIV.CHZ. 2024-02-21T01:43:13.78 0.3 undecidable manual S 311 13.5753 117 0.05 74
TV.SF11.HHE. 2024-02-21T01:43:13.10 0.1 undecidable manual P 332 21.3675 108 0.14 96
IV.LATE.HHZ. 2024-02-21T01:43:12.46 0.3 undecidable manual S 179 9.2796 126 -0.01 76
IV.SACS.HHZ. 2024-02-21T01:43:12.43 0.1 undecidable manual P 28 18.9699 110 -0.06 98
IV.MCIV.CHZ. 2024-02-21T01:43:11.80 0.3 undecidable manual P 311 13.5753 117 0.3 71
IV.LATE.HHZ. 2024-02-21T01:43:10.72 0.1 positive manual P 179 9.2796 126 -0.06 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.LATE.HHE. ML:1.6 0.0005989999999999999 0.18 AML other m 2024-02-21T01:43:12.84
IV.LATE.HHN. ML:1.7 0.000764 0.98 AML other m 2024-02-21T01:43:14.18
IV.SACS.HHE. ML:1.0 0.00008295 0.64 AML other m 2024-02-21T01:43:16.72
IV.SACS.HHN. ML:1.0 0.00007849999999999998 0.26 AML other m 2024-02-21T01:43:16.43
IV.MCIV.CHN. ML:1.0 0.00011249999999999998 0.18 AML other m 2024-02-21T01:43:16.66
IV.MCIV.CHE. ML:0.9 0.00009035 1.72 AML other m 2024-02-21T01:43:18.91
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