Earthquake with magnitude of ML 1.5 on date 27-10-2020 and time 10:52:17 (UTC) in region 2 km SW Castiglione d'Orcia (SI)

A magnitude ML 1.5 earthquake occured in region: 2 km SW Castiglione d'Orcia (SI), on

  • 27-10-2020 10:52:17 (UTC)
  • 27-10-2020 11:52:17 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.9940, 11.5950 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
Abbadia San Salvatore SI 14 6444 24303
Arcidosso GR 14 4285 28588
Radicofani SI 18 1097 29685
San Giovanni d'Asso SI 18 853 30538
Piancastagnaio SI 18 4230 34768
Santa Fiora GR 18 2622 37390
Buonconvento SI 19 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)
76 Km NW of Viterbo (67173 inhabitants)
90 Km W of Foligno (57155 inhabitants)
91 Km SE of Firenze (382808 inhabitants)
91 Km SE of Scandicci (50609 inhabitants)
98 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 1.5 2020-10-27
10:52:17
42.9942 11.5952 11 2021-02-26
14:56:07
Bollettino Sismico Italiano INGV 84979731
Reviewed
Rev100
ML 1.7 2020-10-27
10:52:17
43.0162 11.6047 11 2020-10-27
10:58:22
Sala Sismica INGV-Roma 84178041
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-10-27 10:52:17 ± 0.09
Latitude 42.9942 ± 0.0063
Longitude 11.5952 ± 0.0037
Depth (km) 11 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 84979731

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 760
Semi-minor axis of confidence ellipse (meter) 110
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 25
Circular confidence region, given by single value of horizontal uncertainty (meter) 760.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 42
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) 0.29
Epicentral distance of station closest to the epicenter (degree) 0.13939
Epicentral distance of station farthest from the epicenter (degree) 0.89213
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:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 84178041
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-10-27 10:58:22

ML:1.5

Field Value
Value 1.5
Uncertainty 0.3
Num. used stations 22
Type of magnitude ML
Reference to an origin 84979731
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-11-24 10:59:55
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CASP.HHZ. 2020-10-27T10:52:37.37 0.6 undecidable manual S 249 63.492 90 0.48 42
IV.RINC.HHN. 2020-10-27T10:52:34.40 0.6 undecidable manual P 1 99.0231 90 0.23 41
IV.PARC.HHZ. 2020-10-27T10:52:32.74 0.6 undecidable manual P 35 89.244 90 0.06 43
IV.ATVO.HHZ. 2020-10-27T10:52:31.10 0.6 undecidable manual P 56 78.4659 90 0.09 44
IV.CRE.HHE. 2020-10-27T10:52:30.60 0.3 undecidable manual P 22 75.0693 90 0.12 65
IV.FROS.CHZ. 2020-10-27T10:52:30.55 0.3 undecidable manual S 304 42.8238 90 -0.84 59
IV.MGAB.HHZ. 2020-10-27T10:52:30.78 0.6 undecidable manual S 102 42.9237 90 -0.63 42
IV.ATMI.HHZ. 2020-10-27T10:52:29.70 0.6 undecidable manual P 55 66.2781 90 0.57 39
IV.CASP.HHZ. 2020-10-27T10:52:29.26 0.6 undecidable manual P 249 63.492 90 0.57 40
IV.ATMC.EHE. 2020-10-27T10:52:29.54 0.3 undecidable manual P 44 69.6747 90 -0.11 68
IV.ATVA.EHE. 2020-10-27T10:52:28.64 0.6 undecidable manual P 60 64.1913 90 -0.17 45
IV.CSNT.HHZ. 2020-10-27T10:52:27.06 0.1 undecidable manual P 335 58.5969 90 -0.88 75
IV.TRIF.CHZ. 2020-10-27T10:52:27.89 0.3 undecidable manual P 284 57.6978 90 0.08 68
IV.MCIV.CHZ. 2020-10-27T10:52:26.35 0.6 undecidable manual S 165 24.753 90 -0.22 47
TV.SF14.HHZ. 2020-10-27T10:52:26.75 0.6 undecidable manual S 177 26.5512 90 -0.29 46
IV.CAFI.HHZ. 2020-10-27T10:52:25.83 0.1 undecidable manual P 39 47.8188 90 -0.45 88
TV.SF01.EHZ. 2020-10-27T10:52:25.16 0.6 undecidable manual S 187 20.3685 90 -0.23 47
TV.SF13.HHN. 2020-10-27T10:52:25.05 0.6 undecidable manual S 174 19.5693 90 -0.13 49
IV.FROS.CHZ. 2020-10-27T10:52:25.08 0.1 undecidable manual P 304 42.8238 90 -0.44 89
TV.SF03.EHE. 2020-10-27T10:52:25.73 0.3 undecidable manual S 161 22.4553 90 -0.22 71
IV.MGAB.HHZ. 2020-10-27T10:52:25.46 0.1 undecidable manual P 102 42.9237 90 -0.07 96
IV.RIBO.EHE.01 2020-10-27T10:52:25.94 0.3 undecidable manual P 264 44.8218 90 0.12 70
IV.SACS.HHZ. 2020-10-27T10:52:24.08 0.6 undecidable manual P 122 30.1476 90 0.51 44
TV.SF04.EHZ. 2020-10-27T10:52:24.63 0.3 undecidable manual S 163 18.3705 90 -0.22 72
IV.ARCI.HHZ. 2020-10-27T10:52:24.99 0.6 undecidable manual S 212 18.5703 90 0.09 50
IV.MCIV.CHZ. 2020-10-27T10:52:23.01 0.1 positive manual P 165 24.753 90 0.28 94
TV.SF11.HHZ. 2020-10-27T10:52:23.84 0.3 undecidable manual S 154 15.4734 90 -0.25 72
TV.SF14.HHZ. 2020-10-27T10:52:23.22 0.1 undecidable manual P 177 26.5512 90 0.21 95
TV.SF13.HHN. 2020-10-27T10:52:22.19 0.1 positive manual P 174 19.5693 90 0.26 95
TV.SF03.EHE. 2020-10-27T10:52:22.61 0.1 undecidable manual P 161 22.4553 90 0.23 95
TV.SF01.EHZ. 2020-10-27T10:52:22.20 0.1 undecidable manual P 187 20.3685 90 0.14 97
TV.SF11.HHZ. 2020-10-27T10:52:21.48 0.1 undecidable manual P 154 15.4734 90 0.18 97
IV.ARCI.HHZ. 2020-10-27T10:52:21.79 0.1 positive manual P 212 18.5703 90 0.02 100
TV.SF04.EHZ. 2020-10-27T10:52:21.99 0.1 undecidable manual P 163 18.3705 90 0.24 96
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ARCI.HHE. ML:1.5 0.00025644944999999995 0.1024 AML other m 2020-10-27T10:52:26.11
IV.ARCI.HHN. ML:1.4 0.00019681559999999997 0.16 AML other m 2020-10-27T10:52:26.03
TV.SF04.EHE. ML:2.3 0.0016638985000000002 0.2176 AML other m 2020-10-27T10:52:25.76
TV.SF04.EHN. ML:2.2 0.001328559 0.1792 AML other m 2020-10-27T10:52:25.70
TV.SF01.EHN. ML:2.3 0.00147 0.24 AML other m 2020-10-27T10:52:26.28
TV.SF01.EHE. ML:2.0 0.0006788005500000001 0.2048 AML other m 2020-10-27T10:52:26.31
IV.MCIV.CHE. ML:1.6 0.00026108290000000003 0.1856 AML other m 2020-10-27T10:52:28.85
IV.MCIV.CHN. ML:1.5 0.00019987835 0.1792 AML other m 2020-10-27T10:52:27.62
IV.SACS.HHE. ML:1.1 0.00005751594 0.2176 AML other m 2020-10-27T10:52:31.56
IV.SACS.HHN. ML:1.0 0.000050914155000000005 0.4608 AML other m 2020-10-27T10:52:33.98
IV.FROS.CHE. ML:1.6 0.000116038065 0.256 AML other m 2020-10-27T10:52:32.47
IV.FROS.CHN. ML:1.4 0.000086164035 0.1472 AML other m 2020-10-27T10:52:31.36
IV.MGAB.HHE. ML:1.3 0.00005822174500000001 0.1984 AML other m 2020-10-27T10:52:34.84
IV.MGAB.HHN. ML:1.4 0.000075759245 0.16 AML other m 2020-10-27T10:52:33.39
IV.CAFI.HNE. ML:1.6 0.00010540333499999998 0.4288 AML other m 2020-10-27T10:52:34.58
IV.CAFI.HHE. ML:1.2 0.000043518295 1.0432 AML other m 2020-10-27T10:52:34.02
IV.CSNT.HHN. ML:1.6 0.000091335005 0.1408 AML other m 2020-10-27T10:52:35.67
IV.CSNT.HHE. ML:1.4 0.00005227024 0.1216 AML other m 2020-10-27T10:52:35.90
IV.CASP.HHN. ML:1.5 0.000063603145 0.256 AML other m 2020-10-27T10:52:40.14
IV.CASP.HHE. ML:1.5 0.000056523455 0.256 AML other m 2020-10-27T10:52:38.09
IV.ATVO.HHN. ML:1.4 0.000034812926 0.8576 AML other m 2020-10-27T10:52:49.47
IV.ATVO.HHE. ML:1.4 0.000039739585 0.3008 AML other m 2020-10-27T10:52:45.40
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download