Earthquake with magnitude of ML 1.3 on date 31-10-2020 and time 02:45:21 (Italy) in region 1 km W Castiglione d'Orcia (SI)

A magnitude ML 1.3 earthquake occured in region: 1 km W Castiglione d'Orcia (SI), on

  • 31-10-2020 01:45:21 (UTC)
  • 31-10-2020 02:45:21 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.0060, 11.6080 at 10 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 1 2346 2346
San Quirico d'Orcia SI 6 2662 5008
Seggiano GR 10 961 5969
Pienza SI 10 2107 8076
Montalcino SI 11 5093 13169
Castel del Piano GR 14 4690 17859
Abbadia San Salvatore SI 15 6444 24303
Arcidosso GR 16 4285 28588
San Giovanni d'Asso SI 17 853 29441
Montepulciano SI 17 14097 43538
Radicofani SI 18 1097 44635
Buonconvento SI 18 3173 47808
Piancastagnaio SI 19 4230 52038
Chianciano Terme SI 19 7105 59143
Santa Fiora GR 19 2622 61765

Municipalities with at least 50000 inhabitants

An earthquake occurred to
41 Km SE of Siena (53903 inhabitants)
49 Km NE of Grosseto (82087 inhabitants)
56 Km SW of Arezzo (99543 inhabitants)
65 Km W of Perugia (166134 inhabitants)
77 Km NW of Viterbo (67173 inhabitants)
89 Km W of Foligno (57155 inhabitants)
90 Km SE of Firenze (382808 inhabitants)
91 Km SE of Scandicci (50609 inhabitants)
98 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
Reviewed
Rev100
ML 1.3 2020-10-31
01:45:21
43.0062 11.608 10 2020-10-31
02:40:53
Sala Sismica INGV-Roma 84301861
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-10-31 01:45:21 ± 0.16
Latitude 43.0062 ± 0.0081
Longitude 11.6080 ± 0.0111
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 84301861

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 940
Semi-minor axis of confidence ellipse (meter) 866
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 261
Circular confidence region, given by single value of horizontal uncertainty (meter) 940.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 86
Number of associated phases, regardless of their use for origin computation 21
Number of defining phases 21
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.31
Epicentral distance of station closest to the epicenter (degree) 0.14659
Epicentral distance of station farthest from the epicenter (degree) 0.52071
Number of stations at which the event was observed 11
Number of stations from which data was used for origin computation 11
Magnitude information

ML:1.3

Field Value
Value 1.3
Uncertainty 0.4
Num. used stations 9
Type of magnitude ML
Reference to an origin 84301861
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-10-31 02:40:53
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CSNT.HHZ. 2020-10-31T01:45:39.22 0.6 undecidable manual S 334 57.7977 50 -0.79 39
IV.RIBO.EHZ.01 2020-10-31T01:45:37.59 0.6 undecidable manual S 262 46.0206 50 0.74 40
IV.CAFI.HHZ. 2020-10-31T01:45:36.71 0.6 undecidable manual S 39 46.1205 50 -0.17 47
IV.CSNT.HHZ. 2020-10-31T01:45:31.91 0.6 negative manual P 334 57.7977 50 -0.45 44
TV.SF14.HHN. 2020-10-31T01:45:31.21 0.6 undecidable manual S 179 27.8499 50 -0.8 41
IV.CAFI.HHZ. 2020-10-31T01:45:30.52 1.0 negative manual P 39 46.1205 50 -0.04 24
TV.SF03.EHE. 2020-10-31T01:45:30.20 0.6 undecidable manual S 164 23.4543 113 -0.57 45
IV.RIBO.EHZ.01 2020-10-31T01:45:30.68 0.3 positive manual P 262 46.0206 50 0.14 72
TV.SF01.EHZ. 2020-10-31T01:45:30.56 0.6 undecidable manual S 190 21.867 115 0.28 48
TV.SF04.EHZ. 2020-10-31T01:45:29.02 0.6 undecidable manual S 167 19.3695 118 -0.49 46
TV.SF13.HHZ. 2020-10-31T01:45:29.73 0.6 undecidable manual S 177 20.868 116 -0.23 49
IV.ARCI.HHZ. 2020-10-31T01:45:29.43 0.6 undecidable manual S 212 20.1687 117 -0.34 48
TV.SF11.HHN. 2020-10-31T01:45:28.30 0.6 undecidable manual S 159 16.2726 122 -0.28 49
IV.SACS.HNE. 2020-10-31T01:45:28.71 0.1 undecidable manual P 125 30.0477 50 0.62 87
TV.SF14.HHN. 2020-10-31T01:45:27.67 0.1 undecidable manual P 179 27.8499 50 -0.07 100
TV.SF03.EHE. 2020-10-31T01:45:27.21 0.1 undecidable manual P 164 23.4543 113 0.18 99
IV.ARCI.HHZ. 2020-10-31T01:45:26.48 0.3 negative manual P 212 20.1687 117 0.03 77
TV.SF04.EHZ. 2020-10-31T01:45:26.60 0.6 undecidable manual P 167 19.3695 118 0.3 48
TV.SF11.HHN. 2020-10-31T01:45:26.01 0.1 undecidable manual P 159 16.2726 122 0.25 98
TV.SF01.EHZ. 2020-10-31T01:45:26.96 1.0 positive manual P 190 21.867 115 0.22 25
TV.SF13.HHZ. 2020-10-31T01:45:26.73 0.1 undecidable manual P 177 20.868 116 0.17 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
TV.SF04.EHN. ML:1.6 0.00029099999999999997 0.44 AML other m 2020-10-31T01:45:30.34
TV.SF04.EHE. ML:1.6 0.0003 0.1 AML other m 2020-10-31T01:45:30.39
IV.ARCI.HHN. ML:1.1 0.0000897 0.94 AML other m 2020-10-31T01:45:30.66
TV.SF01.EHE. ML:1.5 0.00022700000000000002 0.24 AML other m 2020-10-31T01:45:30.93
TV.SF01.EHN. ML:1.8 0.00040800000000000005 0.24 AML other m 2020-10-31T01:45:30.79
IV.ARCI.HHE. ML:1.0 0.00008225 0.42 AML other m 2020-10-31T01:45:31.67
IV.CAFI.HHE. ML:0.5 0.0000105003305 0.34 AML other m 2020-10-31T01:45:40.01
IV.CAFI.HHN. ML:0.7 0.000013816598499999998 0.86 AML other m 2020-10-31T01:45:42.33
IV.CAFI.HNE. ML:1.5 0.000089930005 0.7192 AML other m 2020-10-31T01:45:38.90
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
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QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download