Earthquake with magnitude of ML 2.1 on date 27-10-2020 and time 21:11:48 (Italy) in region 2 km W Castiglione d'Orcia (SI)

A magnitude ML 2.1 earthquake occured in region: 2 km W Castiglione d'Orcia (SI), on

  • 27-10-2020 20:11:48 (UTC)
  • 27-10-2020 21:11:48 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.01, 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 6 2662 5008
Seggiano GR 9 961 5969
Montalcino SI 10 5093 11062
Pienza SI 11 2107 13169
Castel del Piano GR 13 4690 17859
Arcidosso GR 15 4285 22144
Abbadia San Salvatore SI 16 6444 28588
San Giovanni d'Asso SI 17 853 29441
Buonconvento SI 17 3173 32614
Montepulciano SI 19 14097 46711
Radicofani SI 19 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)
47 Km NE of Grosseto (82087 inhabitants)
57 Km SW of Arezzo (99543 inhabitants)
66 Km W of Perugia (166134 inhabitants)
78 Km NW of Viterbo (67173 inhabitants)
89 Km SE of Firenze (382808 inhabitants)
90 Km SE of Scandicci (50609 inhabitants)
91 Km W of Foligno (57155 inhabitants)
100 Km NW of Terni (111501 inhabitants)
Recent and historical seismicity

These maps show the seismicity for different time windows. The earthquake locations reported in these maps are determined in quasi real-time by the personnel on duty in the seismic surveillance center of INGV in Rome. Note that the earthquake source parameters (hypocentral location and magnitude) are the best estimates obstained with the available data and they are adjourned as additional data become available. The source parameters obtained by the personnel on duty are then revised by the group in charge of the INGV Seismic Bulletin (Bollettino Sismico Italiano dell’INGV).

Earthquakes of the 3 days preceding this event

Earthquakes of the 3 days preceding this event *

This map reports the earthquake epicenters located in the 72 hours (3 days) preceding the time of the current earthquake occurrence, using the data acquired by the Italian National Seismic Network and by other collaborating networks in Italy and in the neighbouring countries. The radius of the circle representing the earthquake on the map scales with magnitude. The color depends on the time of occurrence of the earthquakes with respect to the time of generation of the map (red = 1 hour; orange = 24 hours; yellow = 72 hours). The open star shows the epicenter of the current earthquake.
Earthquakes of the 90 days preceding this event

Earthquakes of the 90 days preceding this event *

This map reports the Magnitudo ≥ 1.0 earthquake epicenters located in the 90 days preceding the time of the current earthquake occurrence, using the data acquired by the Italian National Seismic Network and by other collaborating networks in Italy and in the neighbouring countries. The radii of the circles representing the epicenters on the map scale with magnitude. The color of each circle depends on the time of occurrence of the earthquakes with respect to the time of generation of the map (red = 1 hour; orange = 24 hours; yellow = 72 hours; blue = all other earthquakes). The open star shows the epicenter of the current earthquake.
Earthquakes from 1985 to the date of the event

Earthquakes from 1985 to the date of the event *

This map reports the Magnitudo ≥ 2.5 earthquake epicenters located using the data acquired by the Italian National Seismic Network and by other collaborating networks in Italy and in the neighbouring countries. The radii of the circles representing the epicenters on the map scale with magnitude. The color of each circle depends on the time of occurrence of the earthquakes with respect to the time of generation of the map (red = 1 hour; orange = 24 hours; yellow = 72 hours; blue = all other earthquakes). The open star shows the epicenter of the current earthquake.
Earthquakes since 1000 AD until 2019

Earthquakes since 1000 AD until 2019 *

This map shows the epicenters of the historical earthquakes catalogue CPT15 (Catalogo Parametrico dei Terremoti Italiani, 2015 version https://emidius.mi.ingv.it/CPTI15-DBMI15/) with estimated magnitude ≥ 5.0 since 1000 AD until 2014. The epicenters are represented by squares which sides scale with the estimated earthquake magnitude. For earthquakes with magnitude ≥ 6.0, it is also shown the year of occurrence and the magnitude value. The open star shows the epicenter of the current earthquake.
Seismic hazard
Shakemap
Felt maps
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web 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
Bulletin
Rev1000
ML 2.1 2020-10-27
20:11:48
43.01 11.59 11 2021-02-26
14:56:08
Bollettino Sismico Italiano INGV 85052921
Reviewed
Rev100
ML 2.1 2020-10-27
20:11:48
43.01 11.6 11 2020-10-27
20:18:36
Sala Sismica INGV-Roma 84189971
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-10-27 20:11:48 ± 0.08
Latitude 43.01 ± 0.00
Longitude 11.59 ± 0.00
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 85052921

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 418
Semi-minor axis of confidence ellipse (meter) 203
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 279
Circular confidence region, given by single value of horizontal uncertainty (meter) 420
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 40
Number of associated phases, regardless of their use for origin computation 46
Number of defining phases 46
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.26
Epicentral distance of station closest to the epicenter (degree) 0.15199
Epicentral distance of station farthest from the epicenter (degree) 0.83367
Number of stations at which the event was observed 29
Number of stations from which data was used for origin computation 29
Magnitudes information

ML:2.1

Field Value
Value 2.1
Uncertainty 0.3
Num. used stations 40
Type of magnitude ML
Reference to an origin 85052921
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-11-27 16:00:09

ML:2.1

Field Value
Value 2.1
Uncertainty 0.3
Num. used stations 42
Type of magnitude ML
Reference to an origin 84189971
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-10-27 20:18:36
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.CRE.HHZ. 2020-10-27T20:12:10.16 0.6 undecidable manual S 23 0.6673 50 -0.45 41
IV.ATMC.EHE. 2020-10-27T20:12:09.31 0.6 undecidable manual S 45 0.6223 50 0.02 46
IV.ATMI.HHZ. 2020-10-27T20:12:08.82 0.6 undecidable manual S 56 0.5936 50 0.38 43
IV.CASP.HHZ. 2020-10-27T20:12:07.64 0.6 undecidable manual S 248 0.572 50 -0.14 45
IV.ATVA.EHE. 2020-10-27T20:12:07.94 0.3 undecidable manual S 62 0.5765 50 0.02 70
IV.CSNT.HHZ. 2020-10-27T20:12:05.98 0.6 undecidable manual S 335 0.5153 50 -0.13 45
IV.ASQU.HHE. 2020-10-27T20:12:03.76 0.1 undecidable manual P 10 0.804 50 0.24 84
IV.RUFI.EHE. 2020-10-27T20:12:03.60 0.3 undecidable manual P 356 0.8337 50 -0.43 60
IV.PARC.HHZ. 2020-10-27T20:12:03.51 0.1 negative manual P 36 0.7977 50 0.09 87
IV.MOMA.HHZ. 2020-10-27T20:12:03.19 0.1 undecidable manual P 105 0.7464 50 0.65 76
IV.ATPI.EHZ. 2020-10-27T20:12:02.57 0.3 undecidable manual P 53 0.7401 50 0.13 66
IV.MGAB.HHZ. 2020-10-27T20:12:02.00 0.6 undecidable manual S 103 0.3939 50 -0.51 43
IV.ATVO.HHZ. 2020-10-27T20:12:02.00 0.1 undecidable manual P 57 0.7042 50 0.17 87
IV.RIBO.EHZ. 2020-10-27T20:12:02.48 0.6 undecidable manual S 262 0.4002 50 -0.24 46
IV.MURB.HHZ. 2020-10-27T20:12:02.36 0.3 undecidable manual P 69 0.7293 50 0.11 66
IV.CRE.HHZ. 2020-10-27T20:12:01.47 0.1 undecidable manual P 23 0.6673 50 0.28 86
IV.SSP9.EHZ. 2020-10-27T20:12:01.82 0.6 undecidable manual P 35 0.6916 50 0.22 43
IV.BADI.EHZ. 2020-10-27T20:12:01.54 0.3 undecidable manual P 43 0.6934 50 -0.1 66
IV.ATMI.HHZ. 2020-10-27T20:12:00.29 0.6 undecidable manual P 56 0.5936 50 0.36 43
IV.ATMC.EHE. 2020-10-27T20:12:00.29 0.1 undecidable manual P 45 0.6223 50 -0.14 89
IV.SACS.HHZ. 2020-10-27T20:11:59.62 0.6 undecidable manual S 124 0.2824 50 0.41 45
IV.CASP.HHZ. 2020-10-27T20:11:59.89 0.1 undecidable manual P 248 0.572 50 0.34 87
IV.ATVA.EHE. 2020-10-27T20:11:59.07 0.3 undecidable manual P 62 0.5765 50 -0.56 61
IV.TRIF.CHZ. 2020-10-27T20:11:58.91 0.3 undecidable manual P 282 0.5126 50 0.36 66
TV.SF01.EHZ. 2020-10-27T20:11:57.04 0.3 undecidable manual S 186 0.1943 50 0.43 69
IV.MCIV.CHZ. 2020-10-27T20:11:57.29 0.6 undecidable manual S 164 0.2356 50 -0.55 44
TV.SF14.HHZ. 2020-10-27T20:11:57.62 0.6 undecidable manual S 176 0.2509 50 -0.67 42
IV.CSNT.HHZ. 2020-10-27T20:11:57.90 0.1 undecidable manual P 335 0.5153 50 -0.69 78
TV.SF03.EHZ. 2020-10-27T20:11:56.76 0.3 undecidable manual S 161 0.2149 50 -0.45 68
IV.CAFI.HHZ. 2020-10-27T20:11:56.75 0.1 positive manual P 40 0.4245 50 -0.28 90
TV.SF13.HHZ. 2020-10-27T20:11:56.11 0.3 undecidable manual S 173 0.1889 50 -0.32 70
IV.MGAB.HHZ. 2020-10-27T20:11:56.36 0.1 undecidable manual P 103 0.3939 50 -0.15 93
IV.RIBO.EHZ. 2020-10-27T20:11:56.81 0.1 positive manual P 262 0.4002 50 0.19 93
IV.ARCI.HHZ. 2020-10-27T20:11:56.05 0.6 undecidable manual S 208 0.1745 119 0.04 50
TV.SF04.EHZ. 2020-10-27T20:11:55.75 0.3 undecidable manual S 163 0.1781 119 -0.36 70
IV.FROS.CHZ. 2020-10-27T20:11:55.97 0.1 undecidable manual P 303 0.3759 50 -0.23 92
TV.SF14.HHZ. 2020-10-27T20:11:54.27 0.1 positive manual P 176 0.2509 50 0.2 95
IV.SACS.HHZ. 2020-10-27T20:11:54.75 0.1 undecidable manual P 124 0.2824 50 0.15 96
TV.SF11.HHZ. 2020-10-27T20:11:54.94 0.3 undecidable manual S 154 0.152 122 -0.32 71
IV.MCIV.CHZ. 2020-10-27T20:11:54.02 0.1 positive manual P 164 0.2356 50 0.21 95
TV.SF01.EHZ. 2020-10-27T20:11:53.22 0.1 positive manual P 186 0.1943 50 0.12 98
TV.SF13.HHZ. 2020-10-27T20:11:53.19 0.1 positive manual P 173 0.1889 50 0.19 97
TV.SF03.EHZ. 2020-10-27T20:11:53.67 0.1 positive manual P 161 0.2149 50 0.22 95
TV.SF11.HHZ. 2020-10-27T20:11:52.35 0.1 positive manual P 154 0.152 122 0.03 100
IV.ARCI.HHZ. 2020-10-27T20:11:52.79 0.1 positive manual P 208 0.1745 119 0.03 100
TV.SF04.EHZ. 2020-10-27T20:11:52.97 0.1 positive manual P 163 0.1781 119 0.15 97
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
TV.SF04.EHN. ML:2.7 0.003965 1.6 AML other m 2020-10-27T20:11:56.85
TV.SF04.EHE. ML:2.9 0.0055 0.18 AML other m 2020-10-27T20:11:57.17
IV.ARCI.HHN. ML:2.1 0.0009575 0.44 AML other m 2020-10-27T20:11:57.38
TV.SF01.EHE. ML:2.6 0.002895 0.22 AML other m 2020-10-27T20:11:57.35
TV.SF01.EHN. ML:2.8 0.004845 0.22 AML other m 2020-10-27T20:11:57.33
IV.ARCI.HHE. ML:2.2 0.001145 1.14 AML other m 2020-10-27T20:11:58.63
IV.MCIV.CHN. ML:2.2 0.0008215 0.5 AML other m 2020-10-27T20:11:58.48
IV.MCIV.CHE. ML:2.2 0.000992 0.66 AML other m 2020-10-27T20:11:59.97
IV.FROS.CHN. ML:2.1 0.000446 0.94 AML other m 2020-10-27T20:12:03.41
IV.MGAB.HHN. ML:2 0.000288 0.34 AML other m 2020-10-27T20:12:05.55
IV.MGAB.HHE. ML:2 0.0003035 0.38 AML other m 2020-10-27T20:12:05.56
IV.FROS.CHE. ML:2.2 0.0005485 1.64 AML other m 2020-10-27T20:12:05.89
IV.CSNT.HHE. ML:2.1 0.0002485 0.26 AML other m 2020-10-27T20:12:06.35
IV.SACS.HHE. ML:1.6 0.0002015 0.4 AML other m 2020-10-27T20:12:06.70
IV.SACS.HHN. ML:1.7 0.000231 0.84 AML other m 2020-10-27T20:12:07.03
IV.TRIF.CHN. ML:2 0.0002365 0.28 AML other m 2020-10-27T20:12:07.59
IV.CSNT.HHN. ML:1.9 0.000189 0.48 AML other m 2020-10-27T20:12:08.53
IV.TRIF.CHE. ML:2.2 0.000318 1.74 AML other m 2020-10-27T20:12:09.12
IV.ATMI.HHE. ML:2.4 0.000541 0.32 AML other m 2020-10-27T20:12:10.36
IV.CASP.HHN. ML:2.1 0.0002245 1.34 AML other m 2020-10-27T20:12:10.19
IV.CASP.HHE. ML:2.1 0.000255 0.36 AML other m 2020-10-27T20:12:11.19
IV.ATMI.HHN. ML:2.7 0.0008985 0.36 AML other m 2020-10-27T20:12:11.10
IV.CRE.HHN. ML:2 0.000153 1.06 AML other m 2020-10-27T20:12:12.25
IV.CRE.HHE. ML:2.1 0.0001965 0.82 AML other m 2020-10-27T20:12:14.55
IV.MURB.HHN. ML:3 0.00128 0.32 AML other m 2020-10-27T20:12:14.29
IV.MURB.HNN. ML:2.9 0.001145 0.32 AML other m 2020-10-27T20:12:14.14
IV.MURB.HHE. ML:2.7 0.0007965 0.28 AML other m 2020-10-27T20:12:15.36
IV.MURB.HNE. ML:2.7 0.0007655 0.28 AML other m 2020-10-27T20:12:15.51
IV.BADI.EHN. ML:1.9 0.0001205 1.44 AML other m 2020-10-27T20:12:16.14
IV.ATVO.HHE. ML:2.2 0.000247 0.36 AML other m 2020-10-27T20:12:16.30
IV.ATVO.HHN. ML:1.9 0.0001205 0.34 AML other m 2020-10-27T20:12:16.32
IV.BADI.EHE. ML:1.9 0.00011885 0.72 AML other m 2020-10-27T20:12:16.79
IV.MOMA.HHE. ML:1.9 9.465E-5 1.46 AML other m 2020-10-27T20:12:17.18
IV.SSP9.EHE. ML:2 0.00014635 0.44 AML other m 2020-10-27T20:12:17.40
IV.ATPI.EHN. ML:2.1 0.0001645 0.36 AML other m 2020-10-27T20:12:17.69
IV.ATPI.EHE. ML:1.9 0.0001029 0.72 AML other m 2020-10-27T20:12:17.62
IV.ATFO.HHE. ML:0 0.000121 0.62 AML other m 2020-10-27T20:12:19.33
IV.SSP9.EHN. ML:2 0.000148 1.14 AML other m 2020-10-27T20:12:20.04
IV.ATFO.HHN. ML:0 0.0001345 1.16 AML other m 2020-10-27T20:12:20.10
IV.PARC.HHN. ML:2 0.0001038 1.64 AML other m 2020-10-27T20:12:20.06
IV.PARC.HHE. ML:1.8 8.065E-5 1.3 AML other m 2020-10-27T20:12:21.34
IV.MOMA.HHN. ML:1.7 7.175E-5 0.36 AML other m 2020-10-27T20:12:23.62
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Fault Plane solutions

Fault Plane solutions *

This map reports the focal mechanisms since 1977 in the region. The white and red beach ball symbols are mechanisms determined using the Regional Centroid Moment Tensor (RCMT, http://www.bo.ingv.it/RCMT) and are determined for earthquakes with magnitude larger than 4.5 in the Euro-Mediterranenan area. Occasionally, when there is a good source-receiver geometry of the target earthquake, the RCMT can be obtained also for earthquakes with magnitude larger than 4.0. The blue and white beach ball symbols indicate the mechanisms obtained from application of the Time Domain Moment Tensor (TDMT, http://terremoti.ingv.it/tdmt.html). This technique is used for M ≥ 3.5. The size of the beach ball sysmbol scales with the calculated moment magnitude, Mw.
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download
Waveforms Seismic signals in miniseed + resp format Download