Earthquake with magnitude of ML 1.8 on date 08-09-2020 and time 15:15:20 (UTC) in region 2 km SW Radicofani (SI)

A magnitude ML 1.8 earthquake occured in region: 2 km SW Radicofani (SI), on

  • 08-09-2020 15:15:20 (UTC)
  • 08-09-2020 17:15:20 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.89, 11.75 at 7 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
Radicofani SI 2 1097 1097
Abbadia San Salvatore SI 6 6444 7541
Piancastagnaio SI 6 4230 11771
San Casciano dei Bagni SI 10 1632 13403
Castell'Azzara GR 13 1476 14879
Santa Fiora GR 15 2622 17501
Cetona SI 15 2755 20256
Sarteano SI 15 4717 24973
Proceno VT 16 557 25530
Seggiano GR 17 961 26491
Castiglione d'Orcia SI 17 2346 28837
Castel del Piano GR 17 4690 33527
Arcidosso GR 17 4285 37812
Acquapendente VT 18 5506 43318
Allerona TR 20 1794 45112

Municipalities with at least 50000 inhabitants

An earthquake occurred to
54 Km E of Grosseto (82087 inhabitants)
57 Km W of Perugia (166134 inhabitants)
59 Km SE of Siena (53903 inhabitants)
60 Km NW of Viterbo (67173 inhabitants)
66 Km S of Arezzo (99543 inhabitants)
78 Km W of Foligno (57155 inhabitants)
82 Km W of Terni (111501 inhabitants)
88 Km N of Civitavecchia (52991 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 1.8 2020-09-08
15:15:20
42.89 11.75 7 2021-02-26
14:56:06
Bollettino Sismico Italiano INGV 84772831
Reviewed
Rev100
ML 2.0 2020-09-08
15:15:20
42.88 11.76 7 2020-09-08
15:31:12
Sala Sismica INGV-Roma 82739201
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-09-08 15:15:20 ± 0.07
Latitude 42.89 ± 0.01
Longitude 11.75 ± 0.00
Depth (km) 7 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 84772831

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 691
Semi-minor axis of confidence ellipse (meter) 429
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 178
Circular confidence region, given by single value of horizontal uncertainty (meter) 690
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 65
Number of associated phases, regardless of their use for origin computation 41
Number of defining phases 29
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.27
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.74644
Number of stations at which the event was observed 29
Number of stations from which data was used for origin computation 18
Magnitudes information

ML:2

Field Value
Value 2
Uncertainty 0.4
Num. used stations 31
Type of magnitude ML
Reference to an origin 82739201
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-09-08 15:31:12

ML:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 24
Type of magnitude ML
Reference to an origin 84772831
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-11-30 08:36:28
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.PZUN.HHZ. 2020-09-08T15:17:13.90 3.0 undecidable manual Sg 6.66 0
IV.CMPR.HHZ. 2020-09-08T15:17:12.69 3.0 undecidable manual Sg 7.19 0
IV.SGTA.HHZ. 2020-09-08T15:16:48.66 3.0 undecidable manual Sn -4.93 0
IV.IMI.HHZ. 2020-09-08T15:16:48.59 3.0 undecidable manual Sn 0.77 0
XK.GIZZ.HHZ. 2020-09-08T15:16:42.82 3.0 negative manual Pn 2.89 0
IV.RAVA.EHZ. 2020-09-08T15:16:23.91 3.0 undecidable manual Sg 2.26 0
OT.OT05.EHZ. 2020-09-08T15:16:18.92 3.0 positive manual Pg 7.16 0
IV.EUCT.HNZ. 2020-09-08T15:16:15.11 3.0 positive manual Pg 5.31 0
IV.CMPR.HHZ. 2020-09-08T15:16:15.63 3.0 undecidable manual Pn -4.22 0
IV.SARZ.HHZ. 2020-09-08T15:16:06.29 3.0 negative manual Pn -1.66 0
IV.SBPO.HNZ. 2020-09-08T15:16:04.29 3.0 positive manual Pg 4.66 0
IV.MNTT.EHZ. 2020-09-08T15:16:04.74 3.0 undecidable manual S -3.6 0
IV.CAFI.HHZ. 2020-09-08T15:15:37.19 0.6 undecidable manual S 19 0.4694 50 -0.17 46
IV.CRE.HHZ. 2020-09-08T15:15:35.43 0.3 undecidable manual P 11 0.7464 50 0.61 58
IV.CASP.HHZ. 2020-09-08T15:15:33.60 0.6 undecidable manual P 262 0.6565 50 0.32 43
IV.BARO.EHZ. 2020-09-08T15:15:33.65 0.6 undecidable manual P 161 0.6745 50 0.06 45
IV.MOMA.HHZ. 2020-09-08T15:15:32.30 0.3 undecidable manual P 98 0.6052 50 -0.1 68
IV.CSNT.HHZ. 2020-09-08T15:15:32.99 0.3 undecidable manual P 330 0.6763 50 -0.63 59
IV.FROS.CHE. 2020-09-08T15:15:31.49 0.1 negative manual P 307 0.5423 50 0.16 91
IV.MGAB.HHZ. 2020-09-08T15:15:30.08 0.3 undecidable manual S 84 0.2653 104 -0.6 65
IV.CAFI.HHZ. 2020-09-08T15:15:29.99 0.3 undecidable manual P 19 0.4694 50 -0.1 70
IV.ARCI.HHZ. 2020-09-08T15:15:27.94 0.3 undecidable manual S 261 0.205 108 -0.52 67
TV.SF14.HHN. 2020-09-08T15:15:26.47 0.3 undecidable manual S 218 0.1646 112 -0.53 68
IV.SACS.HHE. 2020-09-08T15:15:26.26 0.6 undecidable manual S 108 0.1214 119 0.79 41
TV.SF01.EHZ. 2020-09-08T15:15:26.61 0.3 undecidable manual S 242 0.1565 113 -0.1 75
IV.LATE.HHZ. 2020-09-08T15:15:26.22 0.3 undecidable manual P 172 0.2743 104 -0.22 71
IV.MGAB.HHZ. 2020-09-08T15:15:25.84 0.3 undecidable manual P 84 0.2653 104 -0.39 69
IV.MCIV.CHZ. 2020-09-08T15:15:25.61 0.3 undecidable manual S 207 0.1205 119 0.16 74
TV.SF13.HHZ. 2020-09-08T15:15:25.26 0.3 undecidable manual S 235 0.1178 119 -0.11 75
IV.ARCI.HHZ. 2020-09-08T15:15:25.11 0.3 undecidable manual P 261 0.205 108 0.16 73
TV.SF04.EHZ. 2020-09-08T15:15:24.17 0.3 undecidable manual S 233 0.0836 128 -0.09 76
TV.SF03.EHE. 2020-09-08T15:15:24.42 0.3 undecidable manual S 210 0.0962 125 -0.23 74
TV.SF14.HHN. 2020-09-08T15:15:24.16 0.3 undecidable manual P 218 0.1646 112 0.05 75
TV.SF01.EHZ. 2020-09-08T15:15:24.21 0.3 undecidable manual P 242 0.1565 113 0.27 72
TV.SF13.HHZ. 2020-09-08T15:15:23.44 0.1 positive manual P 235 0.1178 119 0.28 97
IV.SACS.HHE. 2020-09-08T15:15:23.36 0.1 undecidable manual P 108 0.1214 119 0.14 100
TV.SF11.HHN. 2020-09-08T15:15:23.47 0.3 undecidable manual S 252 0.0567 140 -0.03 77
IV.MCIV.CHZ. 2020-09-08T15:15:23.33 0.1 positive manual P 207 0.1205 119 0.12 100
TV.SF11.HHN. 2020-09-08T15:15:22.29 0.1 negative manual P 252 0.0567 140 0.2 99
TV.SF04.EHZ. 2020-09-08T15:15:22.82 0.3 undecidable manual P 233 0.0836 128 0.29 73
TV.SF03.EHE. 2020-09-08T15:15:22.91 0.3 undecidable manual P 210 0.0962 125 0.16 75
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
TV.SF04.EHE. ML:2.5 0.005369239 0.2048 AML other m 2020-09-08T15:15:24.67
TV.SF04.EHN. ML:2.6 0.0072927895 0.2688 AML other m 2020-09-08T15:15:24.76
TV.SF01.EHN. ML:2.3 0.001681335 0.2048 AML other m 2020-09-08T15:15:26.75
IV.MCIV.CHE. ML:2.2 0.0016720455 0.2304 AML other m 2020-09-08T15:15:27.22
IV.MCIV.CHN. ML:2.1 0.0016323805 0.2048 AML other m 2020-09-08T15:15:27.62
TV.SF01.EHE. ML:2.3 0.001675542 0.3328 AML other m 2020-09-08T15:15:28.15
IV.ARCI.HNN. ML:2 0.00067489145 0.256 AML other m 2020-09-08T15:15:28.40
IV.ARCI.HNE. ML:1.9 0.00054598845 0.1664 AML other m 2020-09-08T15:15:29.47
IV.ARCI.HHE. ML:1.9 0.00055478275 0.1792 AML other m 2020-09-08T15:15:29.56
IV.ARCI.HHN. ML:1.8 0.0003846161 0.256 AML other m 2020-09-08T15:15:30.53
IV.MGAB.HHN. ML:1.8 0.0003594225 0.2304 AML other m 2020-09-08T15:15:31.37
IV.MGAB.HNN. ML:1.8 0.00031843935 0.2176 AML other m 2020-09-08T15:15:31.37
IV.MGAB.HHE. ML:1.8 0.0003544095 0.1408 AML other m 2020-09-08T15:15:33.20
IV.MGAB.HNE. ML:1.8 0.0002878581 0.1408 AML other m 2020-09-08T15:15:33.27
IV.LATE.HHE. ML:1.7 0.00026341845 0.1408 AML other m 2020-09-08T15:15:34.76
IV.LATE.HHN. ML:1.9 0.00037695485 1.5264 AML other m 2020-09-08T15:15:36.85
IV.CAFI.HHE. ML:1.4 5.8357285E-5 0.3712 AML other m 2020-09-08T15:15:38.37
IV.CRE.HHN. ML:0 3.33E-5 0.64 AML other m 2020-09-08T15:15:53.81
IV.CAFI.HHN. ML:1.2 3.783164E-5 1.5776 AML other m 2020-09-08T15:15:41.01
IV.MOMA.HHN. ML:1.7 9.7062315E-5 0.2176 AML other m 2020-09-08T15:15:44.17
IV.MOMA.HHE. ML:1.9 0.00013227565 0.256 AML other m 2020-09-08T15:15:44.42
IV.MURB.HHE. ML:0 0.00033751905 0.2432 AML other m 2020-09-08T15:15:46.23
IV.MURB.HHN. ML:0 0.00033418755 0.2176 AML other m 2020-09-08T15:15:46.51
IV.BARO.EHE. ML:1.4 4.1834765E-5 0.4224 AML other m 2020-09-08T15:15:48.11
IV.BARO.EHN. ML:1.3 2.8521565E-5 1.4496 AML other m 2020-09-08T15:15:51.92
IV.CRE.HHE. ML:1.4 3.025E-5 0.42 AML other m 2020-09-08T15:15:58.12
IV.SBPO.HNE. ML:4.8 0.0124 0.08 AML other m 2020-09-08T15:16:09.24
IV.SBPO.HNN. ML:4.2 0.002785 0.08 AML other m 2020-09-08T15:16:09.30
IV.CMPR.HHE. ML:2.7 2.44E-5 1.28 AML other m 2020-09-08T15:17:39.74
IV.CMPR.HHN. ML:2.9 3.87E-5 1.14 AML other m 2020-09-08T15:17:40.17
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