Earthquake with magnitude of ML 0.8 on date 11-08-2020 and time 18:24:32 (UTC) in region 1 km W Piancastagnaio (SI)

A magnitude ML 0.8 earthquake occured in region: 1 km W Piancastagnaio (SI), on

  • 11-08-2020 18:24:32 (UTC)
  • 11-08-2020 20:24:32 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.85, 11.68 at 5 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 1 4230 4230
Abbadia San Salvatore SI 3 6444 10674
Santa Fiora GR 8 2622 13296
Radicofani SI 9 1097 14393
Castell'Azzara GR 9 1476 15869
Arcidosso GR 11 4285 20154
Castel del Piano GR 12 4690 24844
Seggiano GR 13 961 25805
Roccalbegna GR 16 1044 26849
San Casciano dei Bagni SI 17 1632 28481
Proceno VT 17 557 29038
Semproniano GR 17 1059 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
47 Km E of Grosseto (82087 inhabitants)
59 Km SE of Siena (53903 inhabitants)
60 Km NW of Viterbo (67173 inhabitants)
65 Km W of Perugia (166134 inhabitants)
70 Km S of Arezzo (99543 inhabitants)
85 Km W of Foligno (57155 inhabitants)
85 Km N of Civitavecchia (52991 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
ML 0.8 2020-08-11
18:24:32
42.85 11.68 5 2020-08-11
18:32:27
Sala Sismica INGV-Roma 81884921
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-08-11 18:24:32 ± 0.08
Latitude 42.85 ± 0.00
Longitude 11.68 ± 0.00
Depth (km) 5 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 81884921

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 286
Semi-minor axis of confidence ellipse (meter) 77
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 175
Circular confidence region, given by single value of horizontal uncertainty (meter) 290
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 100
Number of associated phases, regardless of their use for origin computation 17
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.11
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.17177
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 9
Magnitude information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.4
Num. used stations 4
Type of magnitude ML
Reference to an origin 81884921
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-08-11 18:32:27
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
TV.MGAB.HHZ. 2020-08-11T18:24:43.81 3.0 undecidable manual P 0
IV.ARCI.HHZ. 2020-08-11T18:24:38.37 0.1 undecidable manual S 269 0.1466 108 -0.23 94
IV.SACS.HHZ. 2020-08-11T18:24:36.57 0.3 undecidable manual P 91 0.1718 105 -0.05 72
TV.SF01.EHZ. 2020-08-11T18:24:36.64 0.1 undecidable manual S 243 0.0926 117 -0.01 99
IV.ARCI.HHZ. 2020-08-11T18:24:36.12 0.6 undecidable manual P 269 0.1466 108 0.03 49
TV.SF01.EHZ. 2020-08-11T18:24:35.09 0.1 undecidable manual P 243 0.0926 117 0.13 96
IV.MCIV.CHZ. 2020-08-11T18:24:35.89 0.6 undecidable manual S 179 0.0746 122 -0.18 48
TV.SF14.HHE. 2020-08-11T18:24:35.21 0.1 undecidable manual P 204 0.1079 113 -0.07 97
TV.SF13.HHE. 2020-08-11T18:24:35.54 0.1 undecidable manual S 229 0.054 131 0.12 97
TV.SF03.EHN. 2020-08-11T18:24:35.25 0.1 undecidable manual S 172 0.0513 132 -0.09 98
TV.SF13.HHE. 2020-08-11T18:24:34.44 0.1 undecidable manual P 229 0.054 131 0.18 96
TV.SF04.EHZ. 2020-08-11T18:24:34.66 0.1 undecidable manual S 212 0.0216 156 0.02 100
TV.SF03.EHN. 2020-08-11T18:24:34.24 0.1 undecidable manual P 172 0.0513 132 0.04 99
IV.MCIV.CHZ. 2020-08-11T18:24:34.64 0.1 positive manual P 179 0.0746 122 0.01 99
TV.SF11.HHE. 2020-08-11T18:24:34.50 0.1 undecidable manual S 9 0.0153 162 -0.05 99
TV.SF11.HHE. 2020-08-11T18:24:33.79 0.1 undecidable manual P 9 0.0153 162 0.03 100
TV.SF04.EHZ. 2020-08-11T18:24:33.86 0.1 undecidable manual P 212 0.0216 156 0.06 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
TV.SF04.EHE. ML:0 0.0015785175 0.1408 AML other m 2020-08-11T18:24:34.78
TV.SF04.EHN. ML:0 0.0022462955 0.128 AML other m 2020-08-11T18:24:34.96
IV.MCIV.CHE. ML:0 0.00020856415 0.1664 AML other m 2020-08-11T18:24:36.53
IV.MCIV.CHN. ML:0 0.0001773139 0.1408 AML other m 2020-08-11T18:24:36.05
TV.SF01.EHE. ML:1.1 0.00020321985 0.256 AML other m 2020-08-11T18:24:38.29
TV.SF01.EHN. ML:1.1 0.00018821675 0.2048 AML other m 2020-08-11T18:24:36.84
IV.ARCI.HHE. ML:0.6 3.761718E-5 0.2816 AML other m 2020-08-11T18:24:38.80
IV.ARCI.HHN. ML:0.3 2.2301185E-5 0.1664 AML other m 2020-08-11T18:24:39.18
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