Earthquake with magnitude of ML 1.9 on date 02-04-2020 and time 06:09:02 (Italy) in region 4 km W Arcidosso (GR)

A magnitude ML 1.9 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) 42.88, 11.49 at 7 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
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
Semproniano GR 17 1059 23723
Piancastagnaio SI 17 4230 27953
Castiglione d'Orcia SI 18 2346 30299
Campagnatico GR 18 2412 32711

Municipalities with at least 50000 inhabitants

An earthquake occurred to
33 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)
90 Km N of Civitavecchia (52991 inhabitants)
99 Km W of Foligno (57155 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled 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
Rev 100 ML 1.9 2020-04-02
04:09:02
42.88 11.49 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 ± 0.11
Latitude 42.88 ± 0.01
Longitude 11.49 ± 0.01
Depth (km) 7 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 77777371

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1022
Semi-minor axis of confidence ellipse (meter) 438
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 193
Circular confidence region, given by single value of horizontal uncertainty (meter) 1020
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 21
Number of defining phases 20
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) 0.61514
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 13
Magnitude information

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 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 0.3067 102 0.4 66
IV.CSNT.HHZ. 2020-04-02T04:09:14.02 0.3 undecidable manual P 346 0.6151 50 -0.43 62
IV.MGAB.HHZ. 2020-04-02T04:09:11.67 0.3 undecidable manual P 85 0.4551 50 -0.03 70
IV.FROS.CHZ. 2020-04-02T04:09:10.79 0.3 undecidable manual P 324 0.4146 50 -0.23 67
IV.RIBO.EHZ.01 2020-04-02T04:09:09.69 0.3 undecidable manual P 283 0.3345 101 0.06 71
IV.MCIV.CHZ. 2020-04-02T04:09:08.41 0.1 undecidable manual S 126 0.1655 112 -0.51 89
IV.SACS.HHZ. 2020-04-02T04:09:08.84 0.1 undecidable manual P 95 0.3067 102 -0.17 93
TV.SF14.HHE. 2020-04-02T04:09:08.07 0.1 undecidable manual S 143 0.1493 114 -0.28 94
TV.SF11.HHE. 2020-04-02T04:09:07.77 0.3 undecidable manual S 93 0.1367 116 -0.12 73
TV.SF04.EHZ. 2020-04-02T04:09:07.27 0.1 undecidable manual S 108 0.1286 117 -0.36 92
TV.SF14.HHE. 2020-04-02T04:09:06.00 0.1 undecidable manual P 143 0.1493 114 0.32 93
TV.SF03.EHZ. 2020-04-02T04:09:06.09 0.1 undecidable manual P 117 0.1583 113 0.22 95
IV.MCIV.CHZ. 2020-04-02T04:09:06.14 0.1 undecidable manual P 126 0.1655 112 0.13 96
TV.SF01.EHZ. 2020-04-02T04:09:06.08 0.1 undecidable manual S 141 0.0818 129 -0.03 100
TV.SF04.EHZ. 2020-04-02T04:09:05.51 0.1 undecidable manual P 108 0.1286 117 0.24 95
TV.SF11.HHE. 2020-04-02T04:09:05.55 0.1 undecidable manual P 93 0.1367 116 0.14 97
TV.SF13.HHE. 2020-04-02T04:09:05.21 0.1 undecidable manual P 122 0.1088 122 0.33 93
TV.SF01.EHZ. 2020-04-02T04:09:04.63 0.1 undecidable manual P 141 0.0818 129 0.25 96
IV.ARCI.HHZ. 2020-04-02T04:09:04.57 0.1 undecidable manual S 209 0.027 158 -0.24 97
IV.ARCI.HHZ. 2020-04-02T04:09:03.79 0.1 undecidable manual P 209 0.027 158 0.15 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
TV.SF01.EHE. ML:1.9 0.00117 0.92 AML other m 2020-04-02T04:09:07.01
TV.SF04.EHE. ML:2.3 0.00242 0.2 AML other m 2020-04-02T04:09:08.15
TV.SF04.EHN. ML:2.2 0.001705 0.14 AML other m 2020-04-02T04:09:08.33
TV.SF01.EHN. ML:1.9 0.001215 0.3 AML other m 2020-04-02T04:09:08.78
IV.MCIV.CHE. ML:1.8 0.00057 0.22 AML other m 2020-04-02T04:09:09.30
IV.MCIV.CHN. ML:1.9 0.000727 0.22 AML other m 2020-04-02T04:09:09.44
IV.MGAB.HHN. ML:1.2 4.305E-5 0.42 AML other m 2020-04-02T04:09:20.10
IV.MGAB.HHE. ML:1.2 3.89E-5 0.42 AML other m 2020-04-02T04:09:26.37
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download