Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 02-04-2020 and time 04:09:02 (UTC) in region 4 km W Arcidosso (GR)

A magnitude ML 1.1 earthquake occured in region: 4 km W Arcidosso (GR), on

  • 02-04-2020 04:09:02 (UTC)
  • 02-04-2020 06:09:02 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8780, 11.4950 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.

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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
Arcidosso GR 4 4285 4285
Castel del Piano GR 4 4690 8975
Seggiano GR 8 961 9936
Cinigiano GR 8 2618 12554
Santa Fiora GR 9 2622 15176
Roccalbegna GR 10 1044 16220
Abbadia San Salvatore SI 15 6444 22664
Piancastagnaio SI 16 4230 26894
Semproniano GR 17 1059 27953
Castiglione d'Orcia SI 17 2346 30299
Campagnatico GR 18 2412 32711

Municipalities with at least 50000 inhabitants

An earthquake occurred to
34 Km E of Grosseto (82087 inhabitants)
51 Km S of Siena (53903 inhabitants)
71 Km NW of Viterbo (67173 inhabitants)
73 Km SW of Arezzo (99543 inhabitants)
77 Km W of Perugia (166134 inhabitants)
91 Km N of Civitavecchia (52991 inhabitants)
99 Km W of Foligno (57155 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 1.1 2020-04-02
04:09:02		 42.8775 11.4948 7 2020-07-18
21:08:40		 Bollettino Sismico Italiano INGV 79996951
Reviewed
Rev100 		ML 1.9 2020-04-02
04:09:02		 42.8753 11.493 7 2020-04-02
04:19:17		 Sala Sismica INGV-Roma 77777371
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-04-02 04:09:02 ± 0.09
Latitude 42.8775 ± 0.0081
Longitude 11.4948 ± 0.0061
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 79996951

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 825
Semi-minor axis of confidence ellipse (meter) 408
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 188
Circular confidence region, given by single value of horizontal uncertainty (meter) 830.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 99
Number of associated phases, regardless of their use for origin computation 24
Number of defining phases 23
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) 0.61334
Number of stations at which the event was observed 15
Number of stations from which data was used for origin computation 14
Magnitudes information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.3
Num. used stations 15
Type of magnitude ML
Reference to an origin 79996951
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-06-08 08:50:27

ML:1.9

Field Value
Value 1.9
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 77777371
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-04-02 04:19:17
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SRES.HHZ. 2020-04-02T04:09:20.85 3.0 negative manual P -1.01 0
IV.SACS.HHZ. 2020-04-02T04:09:14.51 0.3 undecidable manual S 95 33.8439 102 0.44 67
IV.CSNT.HHZ. 2020-04-02T04:09:14.02 0.3 undecidable manual P 346 68.0763 50 -0.41 63
IV.MAON.HHZ. 2020-04-02T04:09:13.06 0.6 undecidable manual P 211 57.9975 50 0.19 45
IV.MGAB.HHZ. 2020-04-02T04:09:11.51 0.3 undecidable manual P 85 50.3163 50 -0.18 68
IV.FROS.CHZ. 2020-04-02T04:09:10.79 0.3 undecidable manual P 323 45.9207 50 -0.22 68
IV.RIBO.EHZ.01 2020-04-02T04:09:09.69 0.3 undecidable manual P 282 37.2294 101 0.04 72
TV.SF14.HHE. 2020-04-02T04:09:08.07 0.3 undecidable manual S 144 16.6722 114 -0.31 71
IV.SACS.HHZ. 2020-04-02T04:09:08.99 0.3 undecidable manual P 95 33.8439 102 0 73
TV.SF03.EHZ. 2020-04-02T04:09:08.30 0.6 undecidable manual S 118 17.5713 113 -0.36 46
IV.MCIV.CHZ. 2020-04-02T04:09:08.41 0.3 undecidable manual S 127 18.3705 112 -0.51 67
TV.SF11.HHE. 2020-04-02T04:09:07.77 0.3 undecidable manual S 94 14.9739 116 -0.07 74
TV.SF04.EHZ. 2020-04-02T04:09:07.27 0.3 undecidable manual S 109 14.2746 117 -0.34 70
IV.MCIV.CHZ. 2020-04-02T04:09:06.14 0.3 undecidable manual P 127 18.3705 112 0.12 73
TV.SF01.EHZ. 2020-04-02T04:09:06.08 0.3 undecidable manual S 143 9.1797 129 -0.05 76
TV.SF13.HHE. 2020-04-02T04:09:06.87 0.3 undecidable manual S 123 12.0768 121 -0.08 75
TV.SF14.HHE. 2020-04-02T04:09:06.02 0.1 positive manual P 144 16.6722 114 0.32 94
TV.SF03.EHZ. 2020-04-02T04:09:06.09 0.3 undecidable manual P 118 17.5713 113 0.23 72
TV.SF04.EHZ. 2020-04-02T04:09:05.51 0.1 negative manual P 109 14.2746 117 0.25 96
TV.SF11.HHE. 2020-04-02T04:09:05.55 0.3 undecidable manual P 94 14.9739 116 0.16 73
TV.SF13.HHE. 2020-04-02T04:09:05.21 0.3 undecidable manual P 123 12.0768 121 0.33 71
IV.ARCI.HHZ. 2020-04-02T04:09:04.57 0.3 undecidable manual S 209 3.2967 156 -0.27 73
TV.SF01.EHZ. 2020-04-02T04:09:04.63 0.3 undecidable manual P 143 9.1797 129 0.23 73
IV.ARCI.HHZ. 2020-04-02T04:09:03.79 0.1 negative manual P 209 3.2967 156 0.13 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ARCI.HHE. ML:0.0 0.005894927 0.1216 AML other m 2020-04-02T04:09:04.74
IV.ARCI.HHN. ML:0.0 0.0077772565 0.2176 AML other m 2020-04-02T04:09:04.79
IV.ARCI.HNE. ML:0.0 0.0056543065 0.1408 AML other m 2020-04-02T04:09:04.73
IV.ARCI.HNN. ML:0.0 0.007288505000000001 0.24 AML other m 2020-04-02T04:09:04.78
IV.SACS.HNE. ML:1.8 0.00025771206000000003 0.4672 AML other m 2020-04-02T04:09:24.09
IV.SACS.HHE. ML:0.8 0.00002327636 0.2816 AML other m 2020-04-02T04:09:17.12
IV.SACS.HHN. ML:0.8 0.00002669722 0.2592 AML other m 2020-04-02T04:09:16.03
IV.SACS.HNN. ML:1.8 0.00028374355 1.152 AML other m 2020-04-02T04:09:15.01
IV.RIBO.EHE.01 ML:1.6 0.0001361756 0.24 AML other m 2020-04-02T04:09:16.75
IV.FROS.CHE. ML:1.1 0.0000381618 0.192 AML other m 2020-04-02T04:09:20.14
IV.FROS.CHN. ML:1.1 0.00003348497 0.3584 AML other m 2020-04-02T04:09:18.24
IV.MGAB.HNE. ML:1.1 0.000036555105 44.5408 AML other m 2020-04-02T04:08:48.69
IV.MGAB.HHN. ML:1.0 0.000022997783000000002 0.1408 AML other m 2020-04-02T04:09:20.31
IV.MGAB.HNN. ML:1.1 0.00003639724 0.7008 AML other m 2020-04-02T04:09:32.77
IV.MGAB.HHE. ML:0.9 0.000022127847500000002 0.7008 AML other m 2020-04-02T04:09:26.42
IV.CSNT.HHN. ML:0.9 0.000013481275 1.4816 AML other m 2020-04-02T04:09:13.89
IV.CSNT.HHE. ML:1.2 0.00002443716 1.7184 AML other m 2020-04-02T04:09:20.35
IV.SRES.HHE. ML:1.2 0.000013595549999999999 0.88 AML other m 2020-04-02T04:09:24.83
IV.SRES.HHN. ML:1.4 0.000018029465000000002 1.2192 AML other m 2020-04-02T04:09:35.92
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