Earthquake with magnitude of Md 0.9 on date 24-10-2020 and time 17:11:47 (Italy) in region 2 km W Piancastagnaio (SI)

A magnitude Md 0.9 earthquake occured in region: 2 km W Piancastagnaio (SI), on

  • 24-10-2020 15:11:47 (UTC)
  • 24-10-2020 17:11:47 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.85, 11.67 at 4 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
Piancastagnaio SI 2 4230 4230
Abbadia San Salvatore SI 4 6444 10674
Santa Fiora GR 7 2622 13296
Castell'Azzara GR 8 1476 14772
Radicofani SI 10 1097 15869
Arcidosso GR 11 4285 20154
Castel del Piano GR 12 4690 24844
Seggiano GR 13 961 25805
Roccalbegna GR 15 1044 26849
Semproniano GR 16 1059 27908
Proceno VT 17 557 28465
San Casciano dei Bagni SI 17 1632 30097
Castiglione d'Orcia SI 18 2346 32443
Sorano GR 19 3428 35871
Acquapendente VT 20 5506 41377

Municipalities with at least 50000 inhabitants

An earthquake occurred to
46 Km E of Grosseto (82087 inhabitants)
59 Km SE of Siena (53903 inhabitants)
60 Km NW of Viterbo (67173 inhabitants)
66 Km W of Perugia (166134 inhabitants)
71 Km S of Arezzo (99543 inhabitants)
84 Km N of Civitavecchia (52991 inhabitants)
85 Km W of Foligno (57155 inhabitants)
86 Km W of Terni (111501 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
Md 0.9 2020-10-24
15:11:47
42.85 11.67 4 2020-10-24
15:24:50
Sala Sismica INGV-Roma 84093591
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-10-24 15:11:47 ± 0.11
Latitude 42.85 ± 0.00
Longitude 11.67 ± 0.00
Depth (km) 4 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 84093591

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 367
Semi-minor axis of confidence ellipse (meter) 168
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 291
Circular confidence region, given by single value of horizontal uncertainty (meter) 370
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 142
Number of associated phases, regardless of their use for origin computation 24
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.12
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.09893
Number of stations at which the event was observed 17
Number of stations from which data was used for origin computation 7
Magnitude information

Md:0.9

Field Value
Value 0.9
Uncertainty 0.2
Num. used stations 6
Type of magnitude Md
Reference to an origin 84093591
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-10-24 15:24:50
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.MRVN.HHZ. 2020-10-24T15:13:30.28 3.0 undecidable manual Sg 4.86 0
CR.ZAG.BHZ. 2020-10-24T15:13:29.74 3.0 undecidable manual Sg 4.82 0
GU.RSP.HHZ. 2020-10-24T15:13:27.29 3.0 undecidable manual Sn 2.12 0
IV.CAGR.HHZ. 2020-10-24T15:13:24.18 3.0 undecidable manual Pg 16.870001 0
XK.GIZZ.HHZ. 2020-10-24T15:13:11.71 3.0 negative manual Pg 12.8 0
XK.ALB1.HHZ. 2020-10-24T15:13:03.73 3.0 undecidable manual Pn 2.81 0
IV.PTRJ.HNZ. 2020-10-24T15:12:53.65 3.0 undecidable manual Sn -3.66 0
GU.BLANC.HHZ. 2020-10-24T15:12:45.28 3.0 undecidable manual Pn -0.35 0
IV.PAOL.HHZ. 2020-10-24T15:12:25.54 3.0 positive manual Pn -0.49 0
TV.SF14.HHE. 2020-10-24T15:11:50.82 0.6 undecidable manual S 203 0.0989 109 -0.23 47
TV.SF01.EHZ. 2020-10-24T15:11:50.41 0.6 undecidable manual S 246 0.0836 112 -0.09 49
TV.SF01.EHZ. 2020-10-24T15:11:49.04 0.1 positive manual P 246 0.0836 112 0.01 99
TV.SF14.HHE. 2020-10-24T15:11:49.29 0.1 undecidable manual P 203 0.0989 109 -0.06 98
TV.SF13.HHE. 2020-10-24T15:11:49.34 0.6 undecidable manual S 232 0.0441 127 0.16 48
IV.MCIV.CHZ. 2020-10-24T15:11:49.71 0.3 undecidable manual S 174 0.0674 116 -0.23 71
TV.SF03.EHZ. 2020-10-24T15:11:49.33 0.6 undecidable manual S 163 0.045 127 0.12 49
IV.MCIV.CHZ. 2020-10-24T15:11:48.83 0.1 positive manual P 174 0.0674 116 0.12 97
TV.SF03.EHZ. 2020-10-24T15:11:48.41 0.1 undecidable manual P 163 0.045 127 0.12 97
TV.SF11.HHE. 2020-10-24T15:11:48.51 0.6 undecidable manual S 21 0.0243 144 -0.12 49
TV.SF04.EHZ. 2020-10-24T15:11:48.44 0.6 undecidable manual S 205 0.0117 161 0.04 50
TV.SF13.HHE. 2020-10-24T15:11:48.36 0.1 undecidable manual P 232 0.0441 127 0.09 98
TV.SF11.HHE. 2020-10-24T15:11:47.87 0.1 undecidable manual P 21 0.0243 144 -0.08 99
TV.SF04.EHZ. 2020-10-24T15:11:47.85 0.1 undecidable manual P 205 0.0117 161 0.03 100
IV.MURB.HNZ. 2020-10-24T15:11:41.80 3.0 negative manual P -5.02 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
TV.SF04.EHZ. Md:0.6 5 END duration s
IV.MCIV.CHZ. Md:0.8 6 END duration s
TV.SF01.EHZ. Md:0.9 7 END duration s
TV.SF03.EHZ. Md:0.9 7 END duration s
TV.SF14.HHE. Md:1 8 END duration s
TV.SF11.HHE. Md:1 8 END duration s
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download