Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.3 on date 09-02-2023 and time 02:06:11 (Italy) in region 3 km N Roccalbegna (GR)

A magnitude ML 1.3 earthquake occured in region: 3 km N Roccalbegna (GR), on

  • 09-02-2023 01:06:11 (UTC)
  • 09-02-2023 02:06:11 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.8100, 11.5150 at 7 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
Roccalbegna GR 3 1044 1044
Santa Fiora GR 6 2622 3666
Arcidosso GR 7 4285 7951
Semproniano GR 9 1059 9010
Castel del Piano GR 10 4690 13700
Cinigiano GR 13 2618 16318
Seggiano GR 14 961 17279
Piancastagnaio SI 15 4230 21509
Castell'Azzara GR 16 1476 22985
Abbadia San Salvatore SI 16 6444 29429
Scansano GR 20 4427 33856

Municipalities with at least 50000 inhabitants

An earthquake occurred to
33 Km E of Grosseto (82087 inhabitants)
59 Km S of Siena (53903 inhabitants)
65 Km NW of Viterbo (67173 inhabitants)
79 Km W of Perugia (166134 inhabitants)
79 Km SW of Arezzo (99543 inhabitants)
83 Km N of Civitavecchia (52991 inhabitants)
97 Km W of Terni (111501 inhabitants)
98 Km W of Foligno (57155 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 1.3 2023-02-09
01:06:11		 42.8097 11.5147 7 2024-03-01
17:18:00		 Bollettino Sismico Italiano INGV 115666641
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-02-09 01:06:11 ± 0.09
Latitude 42.8097 ± 0.0045
Longitude 11.5147 ± 0.0049
Depth (km) 7 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 115666641

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 577
Semi-minor axis of confidence ellipse (meter) 233
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 32
Circular confidence region, given by single value of horizontal uncertainty (meter) 580.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 135
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.17
Epicentral distance of station closest to the epicenter (degree) 0.05126
Epicentral distance of station farthest from the epicenter (degree) 0.61514
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 12
Magnitude information

ML:1.3

Field Value
Value 1.3
Uncertainty 0.4
Num. used stations 6
Type of magnitude ML
Reference to an origin 115666641
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2023-03-23 13:45:36
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CAFI.HHZ. 2023-02-09T01:06:23.47 1.0 positive manual P 32 68.2761 50 -0.14 22
IV.CASP.HHE. 2023-02-09T01:06:21.07 0.3 undecidable manual P 268 52.9026 50 -0.17 67
IV.MGAB.HHZ. 2023-02-09T01:06:20.53 0.3 undecidable manual P 77 49.9167 50 -0.25 66
IV.MALA4.EHZ. 2023-02-09T01:06:18.93 0.3 undecidable manual S 352 21.9669 107 -0.1 72
IV.SACS.HHZ. 2023-02-09T01:06:17.68 0.1 undecidable manual P 82 32.4453 101 -0.04 95
IV.LATE.HHN. 2023-02-09T01:06:17.88 0.6 undecidable manual P 133 32.0457 102 0.23 46
IV.MALA5.EHN. 2023-02-09T01:06:16.06 0.3 undecidable manual P 352 22.0668 107 0.35 68
IV.MCIV.CHZ. 2023-02-09T01:06:16.15 0.1 undecidable manual S 105 13.5753 116 -0.19 95
TV.SF11.HHZ. 2023-02-09T01:06:16.63 0.3 undecidable manual S 64 14.874 114 -0.1 73
IV.MALA4.EHZ. 2023-02-09T01:06:15.85 0.3 undecidable manual P 352 21.9669 107 0.17 71
IV.MALA1.EHN. 2023-02-09T01:06:15.69 0.1 undecidable manual P 352 21.7671 107 0.05 97
IV.MALA0.EHN. 2023-02-09T01:06:15.68 0.1 undecidable manual P 351 21.9669 107 -0.01 98
IV.MCIV.CHZ. 2023-02-09T01:06:14.31 0.1 positive manual P 105 13.5753 116 0.19 95
TV.SF11.HHZ. 2023-02-09T01:06:14.52 0.1 undecidable manual P 64 14.874 114 0.17 96
IV.ARCI.HHZ. 2023-02-09T01:06:13.88 0.1 undecidable manual S 326 5.6943 139 -0.21 96
IV.ARCI.HHZ. 2023-02-09T01:06:12.85 0.1 undecidable manual P 326 5.6943 139 0.03 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MCIV.CHN. ML:2.0 0.001185502 0.216 AML other m 2023-02-09T01:06:17.20
IV.MCIV.CHE. ML:2.0 0.0010550000000000002 0.2 AML other m 2023-02-09T01:06:17.26
IV.ARCI.HHE. ML:0.0 0.002422872 0.14 AML other m 2023-02-09T01:06:14.06
IV.ARCI.HHN. ML:0.0 0.003134686 0.16 AML other m 2023-02-09T01:06:14.08
IV.SACS.HHN. ML:1.1 0.000058024785 0.3 AML other m 2023-02-09T01:06:23.53
IV.SACS.HHE. ML:1.2 0.00006553640500000001 0.16 AML other m 2023-02-09T01:06:24.32
IV.MGAB.HHE. ML:1.1 0.000034234945 0.32 AML other m 2023-02-09T01:06:29.04
IV.MGAB.HHN. ML:1.2 0.000037832868 0.18 AML other m 2023-02-09T01:06:29.70
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