Istituto Nazionale di Geofisica e Vulcanologia

Earthquake (quarry blast) with magnitude of ML 0.9 on date 03-12-2020 and time 11:01:13 (Italy) in region 1 km NE Roccastrada (GR)

A magnitude ML 0.9 (quarry blast) earthquake occured in region: 1 km NE Roccastrada (GR), on

  • 03-12-2020 10:01:13 (UTC)
  • 03-12-2020 11:01:13 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.0200, 11.1780 at 0 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

Event type: quarry blast.

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.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Roccastrada GR 1 9199 9199
Civitella Paganico GR 9 3154 12353
Monticiano SI 13 1571 13924
Chiusdino SI 17 1903 15827
Campagnatico GR 17 2412 18239
Montieri GR 18 1204 19443

Municipalities with at least 50000 inhabitants

An earthquake occurred to
29 Km N of Grosseto (82087 inhabitants)
36 Km SW of Siena (53903 inhabitants)
76 Km SW of Arezzo (99543 inhabitants)
82 Km S of Scandicci (50609 inhabitants)
84 Km S of Firenze (382808 inhabitants)
92 Km SE of Livorno (159219 inhabitants)
96 Km S of Prato (191150 inhabitants)
99 Km W of Perugia (166134 inhabitants)
100 Km SE of Pisa (89158 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 0.9 2020-12-03
10:01:13		 43.0197 11.1775 1 2021-02-26
14:56:17		 Bollettino Sismico Italiano INGV 86651621
Reviewed
Rev100 		ML 0.9 2020-12-03
10:01:13		 43.0268 11.1425 6 2020-12-03
10:11:53		 Sala Sismica INGV-Roma 85174231
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-12-03 10:01:13 ± 0.1
Latitude 43.0197 ± 0.0072
Longitude 11.1775 ± 0.0086
Depth (km) 1 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type quarry blast
Origin ID 86651621

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 860
Semi-minor axis of confidence ellipse (meter) 580
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 29
Circular confidence region, given by single value of horizontal uncertainty (meter) 860.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 122
Number of associated phases, regardless of their use for origin computation 15
Number of defining phases 10
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.24
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.59175
Number of stations at which the event was observed 15
Number of stations from which data was used for origin computation 10
Magnitudes information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.1
Num. used stations 5
Type of magnitude ML
Reference to an origin 85174231
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-12-03 10:11:53

ML:0.9

Field Value
Value 0.9
Uncertainty 0.1
Num. used stations 5
Type of magnitude ML
Reference to an origin 86651621
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-01-28 10:50:34
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.STAL.HNZ. 2020-12-03T10:02:45.52 3.0 undecidable manual Sn -3.45 0
IV.SALB.HHZ. 2020-12-03T10:02:45.68 3.0 undecidable manual Pg 17.74 0
GU.GBOS.HHZ. 2020-12-03T10:02:38.11 3.0 undecidable manual Sn 5.09 0
IV.LRP.EHZ. 2020-12-03T10:02:19.35 3.0 undecidable manual Sn 0.07 0
GU.GORR.HHZ. 2020-12-03T10:01:51.74 3.0 undecidable manual Pn 2.39 0
IV.MAON.HNN. 2020-12-03T10:01:26.34 0.3 undecidable manual P 183 65.6898 50 -0.19 67
IV.MCIV.CHE. 2020-12-03T10:01:23.12 0.3 undecidable manual P 123 48.618 91 -0.24 68
TV.SF04.EHZ. 2020-12-03T10:01:22.45 0.1 undecidable manual P 117 44.2224 91 -0.04 96
TV.SF14.HHE. 2020-12-03T10:01:22.66 0.1 undecidable manual P 129 46.1205 91 -0.2 92
TV.SF13.HHE. 2020-12-03T10:01:22.19 0.1 undecidable manual P 122 42.3243 91 0.09 95
IV.CASP.HHZ. 2020-12-03T10:01:20.62 0.3 undecidable manual P 225 35.9418 91 -0.2 71
IV.ARCI.HNZ. 2020-12-03T10:01:20.27 0.3 undecidable manual P 127 30.5472 91 0.52 66
IV.TRIF.CHZ. 2020-12-03T10:01:18.45 0.3 undecidable manual P 295 24.6531 91 -0.12 73
IV.FROS.CHZ. 2020-12-03T10:01:17.90 0.1 positive manual P 355 21.1677 91 0.03 100
IV.RIBO.EHZ.01 2020-12-03T10:01:16.66 0.3 undecidable manual P 234 13.1757 92 0.38 71
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.RIBO.EHE.01 ML:1.0 0.00013451590000000002 0.2368 AML other m 2020-12-03T10:01:20.93
IV.FROS.CHE. ML:0.8 0.000049292905 0.1856 AML other m 2020-12-03T10:01:22.31
IV.FROS.CHN. ML:0.9 0.00006484912499999999 0.32 AML other m 2020-12-03T10:01:22.59
IV.TRIF.CHE. ML:0.9 0.000055448485 1.584 AML other m 2020-12-03T10:01:25.03
IV.TRIF.CHN. ML:0.8 0.00004512541000000001 0.4224 AML other m 2020-12-03T10:01:26.66
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