Earthquake with magnitude of ML 1.6 on date 28-10-2020 and time 03:45:58 (Italy) in region 2 km W Castiglione d'Orcia (SI)

A magnitude ML 1.6 earthquake occured in region: 2 km W Castiglione d'Orcia (SI), on

  • 28-10-2020 02:45:58 (UTC)
  • 28-10-2020 03:45:58 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43, 11.6 at 11 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
Castiglione d'Orcia SI 2 2346 2346
San Quirico d'Orcia SI 6 2662 5008
Seggiano GR 9 961 5969
Montalcino SI 11 5093 11062
Pienza SI 11 2107 13169
Castel del Piano GR 13 4690 17859
Abbadia San Salvatore SI 15 6444 24303
Arcidosso GR 15 4285 28588
San Giovanni d'Asso SI 17 853 29441
Buonconvento SI 18 3173 32614
Montepulciano SI 18 14097 46711
Radicofani SI 18 1097 47808
Piancastagnaio SI 19 4230 52038
Santa Fiora GR 19 2622 54660

Municipalities with at least 50000 inhabitants

An earthquake occurred to
41 Km SE of Siena (53903 inhabitants)
48 Km NE of Grosseto (82087 inhabitants)
56 Km SW of Arezzo (99543 inhabitants)
66 Km W of Perugia (166134 inhabitants)
77 Km NW of Viterbo (67173 inhabitants)
89 Km SE of Firenze (382808 inhabitants)
90 Km SE of Scandicci (50609 inhabitants)
90 Km W of Foligno (57155 inhabitants)
99 Km NW 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 1.6 2020-10-28
02:45:58
43.01 11.6 11 2020-10-28
02:55:54
Sala Sismica INGV-Roma 84194591
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-10-28 02:45:58 ± 0.1
Latitude 43.01 ± 0.00
Longitude 11.60 ± 0.01
Depth (km) 11 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 84194591

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 559
Semi-minor axis of confidence ellipse (meter) 492
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 216
Circular confidence region, given by single value of horizontal uncertainty (meter) 560
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 64
Number of associated phases, regardless of their use for origin computation 34
Number of defining phases 25
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.28
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.83457
Number of stations at which the event was observed 21
Number of stations from which data was used for origin computation 14
Magnitude information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.4
Num. used stations 20
Type of magnitude ML
Reference to an origin 84194591
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-10-28 02:55:54
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.MURB.HHZ. 2020-10-28T02:46:23.44 3.0 undecidable manual S -0.54 0
IV.CSP1.EHZ. 2020-10-28T02:46:22.44 3.0 positive manual P 1.91 0
IV.ATMI.HHZ. 2020-10-28T02:46:19.04 3.0 undecidable manual S -0.36 0
IV.CSNT.HHZ. 2020-10-28T02:46:15.57 0.6 undecidable manual S 335 0.518 50 -0.61 41
IV.RUFI.EHN. 2020-10-28T02:46:14.44 1.0 undecidable manual P 356 0.8346 50 0.4 20
IV.MURB.HHZ. 2020-10-28T02:46:13.05 3.0 negative manual P 0.36 0
IV.PARC.HHZ. 2020-10-28T02:46:13.93 3.0 undecidable manual P 0.09 0
IV.BADI.EHZ. 2020-10-28T02:46:12.20 3.0 undecidable manual P 0.27 0
IV.MGAB.HHZ. 2020-10-28T02:46:12.16 0.6 undecidable manual S 104 0.3885 50 -0.19 47
IV.RIBO.EHZ.01 2020-10-28T02:46:12.84 0.6 undecidable manual S 262 0.4056 50 -0.01 48
IV.SSP9.EHZ. 2020-10-28T02:46:12.28 0.3 undecidable manual P 34 0.6889 50 0.73 56
IV.ATVO.HHZ. 2020-10-28T02:46:12.43 3.0 positive manual P 0.25 0
IV.FROS.CHZ. 2020-10-28T02:46:11.86 0.6 undecidable manual S 303 0.3804 50 -0.25 46
IV.ATMI.HHZ. 2020-10-28T02:46:10.43 3.0 positive manual P 0.31 0
IV.CASP.HHZ. 2020-10-28T02:46:10.51 3.0 negative manual P 0.22 0
IV.SACS.HHZ. 2020-10-28T02:46:08.73 0.6 undecidable manual S 124 0.2779 50 -0.32 46
IV.CSNT.HHZ. 2020-10-28T02:46:08.18 0.1 undecidable manual P 335 0.518 50 -0.44 86
TV.SF01.EHZ. 2020-10-28T02:46:07.09 0.6 undecidable manual S 187 0.1943 50 0.5 45
IV.MCIV.CHZ. 2020-10-28T02:46:07.17 0.6 undecidable manual S 165 0.2338 50 -0.59 43
IV.RIBO.EHZ.01 2020-10-28T02:46:07.03 0.1 positive manual P 262 0.4056 50 0.33 90
IV.FROS.CHZ. 2020-10-28T02:46:06.17 0.1 undecidable manual P 303 0.3804 50 -0.1 95
IV.CAFI.HHZ. 2020-10-28T02:46:06.84 0.1 undecidable manual P 40 0.4218 50 -0.14 94
IV.MGAB.HHZ. 2020-10-28T02:46:06.45 0.1 undecidable manual P 104 0.3885 50 0.04 96
IV.ARCI.HHZ. 2020-10-28T02:46:05.96 0.6 undecidable manual S 210 0.1763 119 -0.09 50
TV.SF04.EHZ. 2020-10-28T02:46:05.58 0.3 undecidable manual S 164 0.1754 119 -0.44 69
TV.SF13.HHE. 2020-10-28T02:46:05.99 0.3 undecidable manual S 175 0.1871 50 -0.39 70
IV.MCIV.CHZ. 2020-10-28T02:46:04.00 0.1 positive manual P 165 0.2338 50 0.24 95
TV.SF11.HHE. 2020-10-28T02:46:04.79 0.3 undecidable manual S 156 0.1493 123 -0.35 71
IV.SACS.HHZ. 2020-10-28T02:46:04.81 0.1 undecidable manual P 124 0.2779 50 0.3 93
TV.SF01.EHZ. 2020-10-28T02:46:03.23 0.1 positive manual P 187 0.1943 50 0.14 98
TV.SF13.HHE. 2020-10-28T02:46:03.18 0.1 undecidable manual P 175 0.1871 50 0.22 97
IV.ARCI.HHZ. 2020-10-28T02:46:02.83 0.1 positive manual P 210 0.1763 119 0.06 100
TV.SF11.HHE. 2020-10-28T02:46:02.44 0.1 undecidable manual P 156 0.1493 123 0.19 98
TV.SF04.EHZ. 2020-10-28T02:46:02.94 0.1 undecidable manual P 164 0.1754 119 0.18 97
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
TV.SF04.EHN. ML:2.5 0.00263 0.1 AML other m 2020-10-28T02:46:05.71
TV.SF04.EHE. ML:2.4 0.00202 0.24 AML other m 2020-10-28T02:46:06.81
IV.ARCI.HHN. ML:1.6 0.000309 1.04 AML other m 2020-10-28T02:46:07.61
TV.SF01.EHE. ML:2.2 0.001065 0.26 AML other m 2020-10-28T02:46:07.39
TV.SF01.EHN. ML:2.5 0.00203 0.22 AML other m 2020-10-28T02:46:07.25
IV.ARCI.HHE. ML:1.6 0.000317 0.7 AML other m 2020-10-28T02:46:08.54
IV.MCIV.CHE. ML:1.8 0.000352 0.26 AML other m 2020-10-28T02:46:09.53
IV.MCIV.CHN. ML:1.7 0.000301 0.42 AML other m 2020-10-28T02:46:10.25
IV.SACS.HHN. ML:1.2 6.775E-5 1.28 AML other m 2020-10-28T02:46:12.70
IV.SACS.HHE. ML:1.3 8.28E-5 0.54 AML other m 2020-10-28T02:46:12.41
IV.CAFI.HHN. ML:1.3 6.15E-5 0.56 AML other m 2020-10-28T02:46:14.55
IV.CAFI.HHE. ML:1.3 5.58E-5 0.28 AML other m 2020-10-28T02:46:14.77
IV.FROS.CHN. ML:1.5 0.00010795 0.84 AML other m 2020-10-28T02:46:16.04
IV.CSNT.HHE. ML:1.5 7.205E-5 0.88 AML other m 2020-10-28T02:46:16.64
IV.CSNT.HHN. ML:1.5 6.755E-5 0.14 AML other m 2020-10-28T02:46:17.10
IV.FROS.CHE. ML:1.6 0.00012915 0.74 AML other m 2020-10-28T02:46:17.33
IV.ATMI.HHE. ML:2 0.0001675 1.64 AML other m 2020-10-28T02:46:20.88
IV.CASP.HHE. ML:1.4 5.025E-5 0.68 AML other m 2020-10-28T02:46:20.54
IV.ATMI.HHN. ML:2.1 0.0002455 1.62 AML other m 2020-10-28T02:46:21.08
IV.CASP.HHN. ML:1.3 3.59E-5 0.34 AML other m 2020-10-28T02:46:21.12
IV.MURB.HHN. ML:2.6 0.0005105 0.24 AML other m 2020-10-28T02:46:27.30
IV.MURB.HHE. ML:2.3 0.000267 0.3 AML other m 2020-10-28T02:46:28.37
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