Earthquake with magnitude of ML 1.7 on date 27-10-2020 and time 20:32:13 (Italy) in region 2 km SW Castiglione d'Orcia (SI)

A magnitude ML 1.7 earthquake occured in region: 2 km SW Castiglione d'Orcia (SI), on

  • 27-10-2020 19:32:13 (UTC)
  • 27-10-2020 20:32:13 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.99, 11.59 at 11 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 8 2662 5008
Seggiano GR 8 961 5969
Montalcino SI 11 5093 11062
Pienza SI 12 2107 13169
Castel del Piano GR 12 4690 17859
Arcidosso GR 14 4285 22144
Abbadia San Salvatore SI 14 6444 28588
San Giovanni d'Asso SI 18 853 29441
Radicofani SI 18 1097 30538
Piancastagnaio SI 18 4230 34768
Santa Fiora GR 18 2622 37390
Buonconvento SI 18 3173 40563
Montepulciano SI 19 14097 54660
Cinigiano GR 20 2618 57278

Municipalities with at least 50000 inhabitants

An earthquake occurred to
42 Km SE of Siena (53903 inhabitants)
47 Km NE of Grosseto (82087 inhabitants)
58 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 W of Foligno (57155 inhabitants)
91 Km SE of Scandicci (50609 inhabitants)
99 Km W 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 1.7 2020-10-27
19:32:13
42.99 11.59 11 2021-02-26
14:56:08
Bollettino Sismico Italiano INGV 85046311
Reviewed
Rev100
ML 1.7 2020-10-27
19:32:12
43.01 11.6 10 2020-10-27
19:51:57
Sala Sismica INGV-Roma 84189061
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-10-27 19:32:13 ± 0.09
Latitude 42.99 ± 0.00
Longitude 11.59 ± 0.01
Depth (km) 11 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 85046311

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 470
Semi-minor axis of confidence ellipse (meter) 371
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 265
Circular confidence region, given by single value of horizontal uncertainty (meter) 470
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 48
Number of associated phases, regardless of their use for origin computation 36
Number of defining phases 36
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.29
Epicentral distance of station closest to the epicenter (degree) 0.14029
Epicentral distance of station farthest from the epicenter (degree) 0.73115
Number of stations at which the event was observed 20
Number of stations from which data was used for origin computation 20
Magnitudes information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations 26
Type of magnitude ML
Reference to an origin 84189061
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-10-27 19:51:57

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations 26
Type of magnitude ML
Reference to an origin 85046311
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-11-27 08:58:22
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.MURB.HHZ. 2020-10-27T19:32:37.63 0.6 undecidable manual S 68 0.7311 50 0.4 41
IV.CRE.HHZ. 2020-10-27T19:32:35.73 0.6 undecidable manual S 23 0.6763 50 0.1 45
IV.ATMC.EHE. 2020-10-27T19:32:34.36 0.6 undecidable manual S 44 0.6286 50 0.15 45
IV.CASP.HHZ. 2020-10-27T19:32:33.14 0.6 undecidable manual S 249 0.5702 50 0.68 39
IV.TRIF.CHZ. 2020-10-27T19:32:30.46 0.6 undecidable manual S 284 0.518 50 -0.46 43
IV.MURB.HHZ. 2020-10-27T19:32:27.33 0.1 undecidable manual P 68 0.7311 50 0.32 84
IV.RIBO.EHZ.01 2020-10-27T19:32:27.20 0.6 undecidable manual S 264 0.402 50 -0.28 46
IV.MGAB.HHZ. 2020-10-27T19:32:27.20 0.3 undecidable manual S 102 0.3885 50 0.11 71
IV.CRE.HHZ. 2020-10-27T19:32:26.16 0.1 undecidable manual P 23 0.6763 50 0.08 90
IV.FROS.CHZ. 2020-10-27T19:32:26.44 0.6 undecidable manual S 304 0.384 50 -0.52 43
IV.ATVO.HHZ. 2020-10-27T19:32:26.94 0.1 undecidable manual P 57 0.7087 50 0.31 85
IV.CASP.HHZ. 2020-10-27T19:32:25.02 0.1 undecidable manual P 249 0.5702 50 0.77 75
IV.ATMC.EHE. 2020-10-27T19:32:24.92 0.3 undecidable manual P 44 0.6286 50 -0.34 64
IV.TRIF.CHZ. 2020-10-27T19:32:23.77 0.1 undecidable manual P 284 0.518 50 0.41 86
IV.CSNT.HHZ. 2020-10-27T19:32:22.72 0.1 undecidable manual P 335 0.527 50 -0.79 75
TV.SF14.HHZ. 2020-10-27T19:32:22.27 0.3 undecidable manual S 176 0.2392 50 -0.4 69
IV.MCIV.CHZ. 2020-10-27T19:32:21.81 0.6 undecidable manual S 164 0.2239 50 -0.41 46
IV.CAFI.HHZ. 2020-10-27T19:32:21.44 0.1 undecidable manual P 39 0.4317 50 -0.44 87
IV.RIBO.EHZ.01 2020-10-27T19:32:21.55 0.1 positive manual P 264 0.402 50 0.17 93
TV.SF03.EHZ. 2020-10-27T19:32:21.20 0.3 undecidable manual S 160 0.2032 50 -0.39 69
IV.MGAB.HHZ. 2020-10-27T19:32:21.01 0.1 undecidable manual P 102 0.3885 50 -0.14 94
TV.SF04.EHZ. 2020-10-27T19:32:20.09 0.3 undecidable manual S 163 0.1664 120 -0.34 71
TV.SF01.EHZ. 2020-10-27T19:32:20.88 0.6 undecidable manual S 187 0.1835 50 -0.13 49
TV.SF13.HHZ. 2020-10-27T19:32:20.56 0.3 undecidable manual S 174 0.1772 119 -0.23 72
IV.FROS.CHZ. 2020-10-27T19:32:20.70 0.1 undecidable manual P 304 0.384 50 -0.37 90
IV.ARCI.HHZ. 2020-10-27T19:32:20.47 0.6 undecidable manual S 211 0.1664 120 0.04 50
IV.SACS.HHZ. 2020-10-27T19:32:19.26 0.6 undecidable manual P 122 0.2734 50 0.07 49
TV.SF11.HHZ. 2020-10-27T19:32:19.32 0.3 undecidable manual S 153 0.1403 124 -0.28 72
TV.SF03.EHZ. 2020-10-27T19:32:18.18 0.1 positive manual P 160 0.2032 50 0.2 96
IV.MCIV.CHZ. 2020-10-27T19:32:18.53 0.1 positive manual P 164 0.2239 50 0.19 96
TV.SF14.HHZ. 2020-10-27T19:32:18.80 0.1 positive manual P 176 0.2392 50 0.2 96
TV.SF13.HHZ. 2020-10-27T19:32:17.72 0.1 positive manual P 174 0.1772 119 0.21 97
IV.ARCI.HHZ. 2020-10-27T19:32:17.35 0.1 positive manual P 211 0.1664 120 0.05 100
TV.SF04.EHZ. 2020-10-27T19:32:17.42 0.1 undecidable manual P 163 0.1664 120 0.12 99
TV.SF01.EHZ. 2020-10-27T19:32:17.77 0.1 positive manual P 187 0.1835 50 0.13 98
TV.SF11.HHZ. 2020-10-27T19:32:16.92 0.1 undecidable manual P 153 0.1403 124 0.1 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CAFI.HHE. ML:0 0.00011095 1.68 AML other m 2020-10-27T19:32:30.87
IV.MCIV.CHN. ML:1.8 0.000345 0.2 AML other m 2020-10-27T19:32:24.80
IV.CAFI.HHN. ML:1.6 0.0001025 0.9 AML other m 2020-10-27T19:32:28.23
IV.MGAB.HHE. ML:1.6 0.0001425 0.76 AML other m 2020-10-27T19:32:29.61
IV.MGAB.HHN. ML:1.6 0.0001087076 0.1536 AML other m 2020-10-27T19:32:31.88
IV.ARCI.HHE. ML:1.7 0.00038394555 0.2176 AML other m 2020-10-27T19:32:21.63
IV.ARCI.HHN. ML:1.8 0.0004355515 0.3584 AML other m 2020-10-27T19:32:21.66
TV.SF04.EHE. ML:2.4 0.0019670885 0.256 AML other m 2020-10-27T19:32:21.49
TV.SF04.EHN. ML:2.4 0.001815063 0.128 AML other m 2020-10-27T19:32:20.60
TV.SF01.EHN. ML:2.5 0.002457357 0.2432 AML other m 2020-10-27T19:32:21.77
TV.SF01.EHE. ML:2.2 0.0011835555 0.2432 AML other m 2020-10-27T19:32:21.79
IV.SACS.HHE. ML:1.2 7.6382305E-5 0.32 AML other m 2020-10-27T19:32:27.18
IV.SACS.HHN. ML:1.2 8.0031325E-5 0.1792 AML other m 2020-10-27T19:32:26.61
IV.FROS.CHE. ML:1.8 0.0002042208 0.32 AML other m 2020-10-27T19:32:29.09
IV.FROS.CHN. ML:1.7 0.000172154855 0.2816 AML other m 2020-10-27T19:32:29.55
IV.MGAB.HNN. ML:1.6 0.000140380465 0.2048 AML other m 2020-10-27T19:32:31.88
IV.MGAB.HNE. ML:1.6 0.000137096115 0.32 AML other m 2020-10-27T19:32:31.41
IV.RIBO.EHE.01 ML:2.3 0.0006092574 0.1664 AML other m 2020-10-27T19:32:28.91
IV.TRIF.CHN. ML:1.7 0.00010835885 0.3072 AML other m 2020-10-27T19:32:31.95
IV.TRIF.CHE. ML:1.7 0.000119712555 0.2432 AML other m 2020-10-27T19:32:33.79
IV.CASP.HHN. ML:1.7 9.62747E-5 0.32 AML other m 2020-10-27T19:32:35.80
IV.CASP.HHE. ML:1.7 9.6929155E-5 0.2944 AML other m 2020-10-27T19:32:33.76
IV.CRE.HHE. ML:1.7 6.821348E-5 0.2304 AML other m 2020-10-27T19:32:38.05
IV.CRE.HHN. ML:1.7 7.63923315E-5 0.1792 AML other m 2020-10-27T19:32:37.04
IV.ATVO.HHE. ML:1.8 8.421338E-5 0.4096 AML other m 2020-10-27T19:32:40.00
IV.ATVO.HHN. ML:1.4 3.816377E-5 0.3072 AML other m 2020-10-27T19:32:42.62
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
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QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download