Earthquake with magnitude of ML 1.6 on date 28-10-2020 and time 02:23:30 (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 01:23:30 (UTC)
  • 28-10-2020 02:23:30 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43, 11.59 at 10 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.

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 7 2662 5008
Seggiano GR 8 961 5969
Montalcino SI 11 5093 11062
Pienza SI 11 2107 13169
Castel del Piano GR 13 4690 17859
Arcidosso GR 15 4285 22144
Abbadia San Salvatore SI 15 6444 28588
San Giovanni d'Asso SI 17 853 29441
Buonconvento SI 18 3173 32614
Radicofani SI 18 1097 33711
Piancastagnaio SI 19 4230 37941
Montepulciano SI 19 14097 52038
Santa Fiora GR 19 2622 54660
Cinigiano GR 20 2618 57278

Municipalities with at least 50000 inhabitants

An earthquake occurred to
41 Km SE of Siena (53903 inhabitants)
47 Km NE of Grosseto (82087 inhabitants)
57 Km SW of Arezzo (99543 inhabitants)
66 Km W of Perugia (166134 inhabitants)
77 Km NW of Viterbo (67173 inhabitants)
90 Km SE of Firenze (382808 inhabitants)
91 Km SE of Scandicci (50609 inhabitants)
91 Km W of Foligno (57155 inhabitants)
99 Km NW of Terni (111501 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 1.6 2020-10-28
01:23:30
43 11.59 10 2021-02-26
14:56:02
Bollettino Sismico Italiano INGV 84379751
Reviewed
Rev100
ML 1.6 2020-10-28
01:23:29
43.04 11.59 3 2020-10-28
01:32:03
Sala Sismica INGV-Roma 84192701
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-10-28 01:23:30 ± 0.1
Latitude 43.00 ± 0.01
Longitude 11.59 ± 0.01
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 84379751

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 671
Semi-minor axis of confidence ellipse (meter) 559
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 180
Circular confidence region, given by single value of horizontal uncertainty (meter) 670
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 39
Number of associated phases, regardless of their use for origin computation 34
Number of defining phases 34
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.33
Epicentral distance of station closest to the epicenter (degree) 0.14659
Epicentral distance of station farthest from the epicenter (degree) 0.83907
Number of stations at which the event was observed 23
Number of stations from which data was used for origin computation 23
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations 14
Type of magnitude ML
Reference to an origin 84379751
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-11-02 08:30:10

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations 16
Type of magnitude ML
Reference to an origin 84192701
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-10-28 01:32:03
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.CSNT.HHZ. 2020-10-28T01:23:47.84 0.3 undecidable manual S 335 0.5207 50 -0.55 63
IV.RUFI.EHN. 2020-10-28T01:23:46.49 0.1 undecidable manual P 356 0.8391 50 0.33 82
IV.PARC.HHE. 2020-10-28T01:23:45.50 0.1 undecidable manual P 36 0.8013 50 -0.01 89
IV.SSP9.EHZ. 2020-10-28T01:23:44.20 0.1 undecidable manual P 34 0.6952 50 0.5 82
IV.RIBO.EHZ.01 2020-10-28T01:23:44.39 0.3 undecidable manual S 263 0.4011 50 -0.46 66
IV.MURB.HHZ. 2020-10-28T01:23:44.63 0.1 undecidable manual P 69 0.7302 50 0.34 84
IV.FROS.CHZ. 2020-10-28T01:23:43.66 0.3 undecidable manual S 304 0.3795 50 -0.56 64
IV.CRE.HHN. 2020-10-28T01:23:43.46 0.3 undecidable manual P 23 0.6718 50 0.17 66
IV.ATMC.EHZ. 2020-10-28T01:23:42.36 0.1 undecidable manual P 44 0.6259 50 -0.15 90
IV.CASP.HHZ. 2020-10-28T01:23:42.15 0.1 undecidable manual P 249 0.5711 50 0.57 82
IV.ATMI.HHZ. 2020-10-28T01:23:42.19 0.3 undecidable manual P 56 0.5954 50 0.19 67
IV.SACS.HHZ. 2020-10-28T01:23:41.30 0.3 undecidable manual S 123 0.2779 50 0.1 73
IV.TRIF.CHZ. 2020-10-28T01:23:41.02 0.3 undecidable manual P 283 0.5153 50 0.4 65
IV.CSNT.HHZ. 2020-10-28T01:23:40.02 0.3 undecidable manual P 335 0.5207 50 -0.69 59
IV.MCIV.CHZ. 2020-10-28T01:23:39.08 0.1 undecidable manual S 164 0.2302 111 -0.65 85
IV.MGAB.HHZ. 2020-10-28T01:23:38.37 0.1 undecidable manual P 103 0.3912 50 -0.13 94
IV.RIBO.EHZ.01 2020-10-28T01:23:38.81 0.1 undecidable manual P 263 0.4011 50 0.14 94
TV.SF01.EHZ. 2020-10-28T01:23:38.73 0.3 undecidable manual S 186 0.1898 115 0.45 69
IV.ARCI.HHZ. 2020-10-28T01:23:38.10 0.1 undecidable manual S 210 0.1709 117 0.46 92
TV.SF03.EHZ. 2020-10-28T01:23:38.37 0.1 undecidable manual S 161 0.2095 113 -0.61 86
IV.CAFI.HHZ. 2020-10-28T01:23:38.72 0.1 undecidable manual P 40 0.4281 50 -0.4 88
IV.FROS.CHZ. 2020-10-28T01:23:38.07 0.1 undecidable manual P 304 0.3795 50 -0.23 93
TV.SF13.HHE. 2020-10-28T01:23:37.76 0.6 undecidable manual S 173 0.1835 116 -0.3 47
TV.SF04.EHZ. 2020-10-28T01:23:37.31 0.3 undecidable manual S 163 0.1727 117 -0.38 70
TV.SF11.HHZ. 2020-10-28T01:23:36.52 0.3 undecidable manual S 154 0.1466 121 -0.31 72
IV.SACS.HHZ. 2020-10-28T01:23:36.94 0.1 undecidable manual P 123 0.2779 50 0.38 92
TV.SF03.EHZ. 2020-10-28T01:23:35.37 0.1 positive manual P 161 0.2095 113 0.09 99
IV.MCIV.CHZ. 2020-10-28T01:23:35.71 0.1 positive manual P 164 0.2302 111 -0.01 100
TV.SF14.HHN. 2020-10-28T01:23:35.99 0.1 undecidable manual P 176 0.2455 50 -0.02 99
IV.ARCI.HHZ. 2020-10-28T01:23:34.56 0.1 undecidable manual P 210 0.1709 117 0.05 100
TV.SF04.EHZ. 2020-10-28T01:23:34.80 0.1 undecidable manual P 163 0.1727 117 0.26 96
TV.SF11.HHZ. 2020-10-28T01:23:34.18 0.1 undecidable manual P 154 0.1466 121 0.14 99
TV.SF13.HHE. 2020-10-28T01:23:34.93 0.1 positive manual P 173 0.1835 116 0.18 97
TV.SF01.EHZ. 2020-10-28T01:23:34.95 0.1 positive manual P 186 0.1898 115 0.07 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
TV.SF04.EHE. ML:1.9 0.0006255 0.4 AML other m 2020-10-28T01:23:38.91
TV.SF01.EHE. ML:1.7 0.00034 0.22 AML other m 2020-10-28T01:23:39.00
TV.SF01.EHN. ML:2 0.00074 1.78 AML other m 2020-10-28T01:23:39.99
TV.SF04.EHN. ML:1.9 0.000658 0.26 AML other m 2020-10-28T01:23:39.11
IV.MCIV.CHE. ML:1.4 0.0001365 0.64 AML other m 2020-10-28T01:23:41.30
IV.MCIV.CHN. ML:1.3 0.000119 1.76 AML other m 2020-10-28T01:23:42.99
IV.FROS.CHE. ML:1.5 9.29E-5 0.5 AML other m 2020-10-28T01:23:45.63
IV.FROS.CHN. ML:1.6 0.000113 0.44 AML other m 2020-10-28T01:23:47.83
IV.CAFI.HHN. ML:1.1 3.39E-5 1.06 AML other m 2020-10-28T01:23:47.68
IV.CAFI.HHE. ML:1.2 3.785E-5 0.32 AML other m 2020-10-28T01:23:48.29
IV.CSNT.HHE. ML:1.4 5.625E-5 0.38 AML other m 2020-10-28T01:23:48.36
IV.CSNT.HHN. ML:1.4 6.225E-5 0.18 AML other m 2020-10-28T01:23:49.04
IV.ATMI.HHN. ML:1.7 9.88E-5 1.68 AML other m 2020-10-28T01:23:52.99
IV.ATMI.HHE. ML:1.7 0.00010215 0.38 AML other m 2020-10-28T01:23:56.35
IV.MURB.HHE. ML:2 0.000124 0.42 AML other m 2020-10-28T01:23:58.05
IV.MURB.HHN. ML:2.2 0.00022 0.26 AML other m 2020-10-28T01:23:59.08
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
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