Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.6 on date 30-07-2023 and time 06:02:40 (Italy) in region 9 km NW Seggiano (GR)

A magnitude ML 0.6 earthquake occured in region: 9 km NW Seggiano (GR), on

  • 30-07-2023 04:02:40 (UTC)
  • 30-07-2023 06:02:40 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.9780, 11.4750 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.

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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
Seggiano GR 9 961 961
Montalcino SI 9 5093 6054
Castel del Piano GR 11 4690 10744
Cinigiano GR 12 2618 13362
Castiglione d'Orcia SI 12 2346 15708
Arcidosso GR 13 4285 19993
San Quirico d'Orcia SI 14 2662 22655
Civitella Paganico GR 16 3154 25809
Buonconvento SI 18 3173 28982
Santa Fiora GR 19 2622 31604
Campagnatico GR 19 2412 34016
Abbadia San Salvatore SI 20 6444 40460

Municipalities with at least 50000 inhabitants

An earthquake occurred to
38 Km NE of Grosseto (82087 inhabitants)
40 Km SE of Siena (53903 inhabitants)
64 Km SW of Arezzo (99543 inhabitants)
76 Km W of Perugia (166134 inhabitants)
81 Km NW of Viterbo (67173 inhabitants)
90 Km S of Firenze (382808 inhabitants)
90 Km S of Scandicci (50609 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 0.6 2023-07-30
04:02:40		 42.9783 11.4752 9 2023-07-30
05:13:50		 Sala Sismica INGV-Roma 119699331
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-07-30 04:02:40 ± 0.13
Latitude 42.9783 ± 0.0081
Longitude 11.4752 ± 0.0160
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 119699331

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1410
Semi-minor axis of confidence ellipse (meter) 621
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 60
Circular confidence region, given by single value of horizontal uncertainty (meter) 1410.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 121
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.31
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.36243
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 8
Magnitude information

ML:0.6

Field Value
Value 0.6
Uncertainty 0.0
Num. used stations 2
Type of magnitude ML
Reference to an origin 119699331
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-07-30 05:13:50
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.PARC.HHZ. 2023-07-30T04:03:06.95 3.0 undecidable manual S -0.68 0
IV.MURB.HNZ. 2023-07-30T04:02:55.31 3.0 undecidable manual P 0.27 0
IV.RIBO.EHZ. 2023-07-30T04:02:51.77 0.6 undecidable manual S 265 34.9428 50 -0.68 41
IV.MCIV.CHE. 2023-07-30T04:02:49.54 0.6 undecidable manual S 143 27.5502 108 -0.72 41
IV.LOCA.HNE. 2023-07-30T04:02:47.65 0.3 undecidable manual P 335 40.2264 50 -0.44 67
IV.FROS.CHN. 2023-07-30T04:02:47.73 0.3 undecidable manual P 315 36.4413 50 0.23 70
TV.SF11.HHE. 2023-07-30T04:02:47.82 0.6 undecidable manual S 126 20.5683 114 -0.17 49
IV.RIBO.EHZ. 2023-07-30T04:02:47.64 0.3 undecidable manual P 265 34.9428 50 0.37 69
IV.MCIV.CHE. 2023-07-30T04:02:46.30 0.3 undecidable manual P 143 27.5502 108 0.29 71
IV.ARCI.HHZ. 2023-07-30T04:02:45.87 0.6 undecidable manual S 180 14.0748 123 -0.12 50
TV.SF11.HHE. 2023-07-30T04:02:44.87 0.3 undecidable manual P 126 20.5683 114 0.17 73
IV.MALA2.EHZ. 2023-07-30T04:02:43.18 0.3 undecidable manual S 5 2.7972 163 -0.3 74
IV.MALA0.EHN. 2023-07-30T04:02:43.22 0.6 undecidable manual S 358 3.0969 161 -0.28 49
IV.ARCI.HHZ. 2023-07-30T04:02:43.82 0.3 undecidable manual P 180 14.0748 123 0.28 72
IV.MALA2.EHZ. 2023-07-30T04:02:42.31 0.1 positive manual P 5 2.7972 163 0.22 100
IV.MALA0.EHN. 2023-07-30T04:02:42.31 0.1 undecidable manual P 358 3.0969 161 0.2 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ARCI.HHN. ML:0.6 0.00003845 0.36 AML other m 2023-07-30T04:02:46.31
IV.ARCI.HHE. ML:0.5 0.00003655 0.78 AML other m 2023-07-30T04:02:51.17
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