Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 08-04-2020 and time 18:53:59 (Italy) in region 5 km N San Casciano dei Bagni (SI)

A magnitude ML 1.4 earthquake occured in region: 5 km N San Casciano dei Bagni (SI), on

  • 08-04-2020 16:53:59 (UTC)
  • 08-04-2020 18:53:59 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.9190, 11.8680 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.

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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
San Casciano dei Bagni SI 5 1632 1632
Cetona SI 6 2755 4387
Sarteano SI 8 4717 9104
Radicofani SI 9 1097 10201
Città della Pieve PG 12 7712 17913
Chiusi SI 13 8704 26617
Fabro TR 13 2876 29493
Allerona TR 15 1794 31287
Monteleone d'Orvieto TR 15 1467 32754
Chianciano Terme SI 16 7105 39859
Abbadia San Salvatore SI 16 6444 46303
Piancastagnaio SI 16 4230 50533
Proceno VT 18 557 51090
Montegabbione TR 18 1216 52306
Ficulle TR 19 1669 53975
Piegaro PG 19 3669 57644
Acquapendente VT 19 5506 63150

Municipalities with at least 50000 inhabitants

An earthquake occurred to
47 Km W of Perugia (166134 inhabitants)
59 Km NW of Viterbo (67173 inhabitants)
61 Km S of Arezzo (99543 inhabitants)
62 Km SE of Siena (53903 inhabitants)
64 Km E of Grosseto (82087 inhabitants)
68 Km W of Foligno (57155 inhabitants)
75 Km NW of Terni (111501 inhabitants)
92 Km N of Civitavecchia (52991 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 1.4 2020-04-08
16:53:59		 42.9192 11.868 11 2020-07-18
21:08:41		 Bollettino Sismico Italiano INGV 80281671
Reviewed
Rev100 		ML 1.5 2020-04-08
16:53:59		 42.9152 11.868 11 2020-04-08
17:06:58		 Sala Sismica INGV-Roma 78017901
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-04-08 16:53:59 ± 0.06
Latitude 42.9192 ± 0.0036
Longitude 11.8680 ± 0.0049
Depth (km) 11 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 80281671

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 900
Semi-minor axis of confidence ellipse (meter) 600
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 225
Circular confidence region, given by single value of horizontal uncertainty (meter) 600.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 108
Number of associated phases, regardless of their use for origin computation 28
Number of defining phases 28
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.21
Epicentral distance of station closest to the epicenter (degree) 0.07644
Epicentral distance of station farthest from the epicenter (degree) 0.70237
Number of stations at which the event was observed 18
Number of stations from which data was used for origin computation 18
Magnitudes information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 80281671
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-06-18 11:44:40

ML:1.5

Field Value
Value 1.5
Uncertainty 0.2
Num. used stations 13
Type of magnitude ML
Reference to an origin 78017901
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-04-08 17:06:58
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MURB.HHZ. 2020-04-08T16:54:18.77 0.6 undecidable manual S 54 65.49 90 -0.26 43
IV.ATVA.EHE. 2020-04-08T16:54:15.18 0.6 undecidable manual S 40 52.3032 90 -0.33 44
IV.ATTE.HHN. 2020-04-08T16:54:14.74 0.6 undecidable manual S 52 50.0166 90 -0.18 45
IV.CRE.HHE. 2020-04-08T16:54:13.10 0.6 undecidable manual P 5 77.9664 90 0.57 40
IV.ATPI.EHE. 2020-04-08T16:54:11.96 0.6 undecidable manual P 36 73.0713 90 0.17 44
IV.TB02.DHZ.01 2020-04-08T16:54:11.14 0.6 undecidable manual P 41 66.4779 90 0.37 43
IV.MURB.HHZ. 2020-04-08T16:54:10.78 0.6 undecidable manual P 54 65.49 90 0.17 45
IV.ATLO.EHE. 2020-04-08T16:54:10.12 0.3 undecidable manual P 45 61.9935 90 0.05 69
IV.ATVO.HHN. 2020-04-08T16:54:10.44 0.6 undecidable manual P 40 67.377 90 -0.46 41
IV.ATMI.HHZ. 2020-04-08T16:54:09.13 0.6 undecidable manual P 35 56.2992 90 -0.07 46
TV.SF14.HHZ. 2020-04-08T16:54:08.71 0.3 undecidable manual S 229 27.4503 90 -0.19 71
IV.ATVA.EHE. 2020-04-08T16:54:08.23 0.6 undecidable manual P 40 52.3032 90 -0.35 44
IV.ATTE.HHN. 2020-04-08T16:54:08.02 0.6 undecidable manual P 52 50.0166 90 -0.22 45
TV.SF01.EHZ. 2020-04-08T16:54:08.55 0.3 undecidable manual S 244 27.4503 90 -0.34 69
IV.MCIV.CHN. 2020-04-08T16:54:07.52 0.6 undecidable manual S 225 22.0668 90 0.08 49
IV.MGAB.HHZ. 2020-04-08T16:54:07.26 0.3 undecidable manual S 92 19.869 90 0.41 70
TV.SF04.EHZ. 2020-04-08T16:54:06.93 1.0 undecidable manual S 241 19.2696 90 0.23 24
IV.LATE.HHN. 2020-04-08T16:54:06.31 1.0 undecidable manual P 189 34.2435 90 0.5 22
TV.SF11.HHZ. 2020-04-08T16:54:05.79 0.6 undecidable manual S 250 16.3725 90 -0.14 49
IV.ARCI.HHZ. 2020-04-08T16:54:05.81 0.3 undecidable manual P 257 32.745 90 0.24 70
TV.SF01.EHZ. 2020-04-08T16:54:04.95 0.6 undecidable manual P 244 27.4503 90 0.19 48
TV.SF14.HHZ. 2020-04-08T16:54:04.96 0.3 undecidable manual P 229 27.4503 90 0.2 71
IV.MCIV.CHN. 2020-04-08T16:54:04.15 0.6 undecidable manual P 225 22.0668 90 0.23 48
IV.MGAB.HHZ. 2020-04-08T16:54:03.16 0.3 undecidable manual P 92 19.869 90 -0.42 68
TV.SF04.EHZ. 2020-04-08T16:54:03.12 0.6 undecidable manual P 241 19.2696 90 -0.37 46
IV.SACS.HHZ. 2020-04-08T16:54:03.85 0.3 undecidable manual S 156 8.4804 128 -0.09 75
TV.SF11.HHZ. 2020-04-08T16:54:03.37 0.6 undecidable manual P 250 16.3725 90 0.33 47
IV.SACS.HHZ. 2020-04-08T16:54:01.83 0.1 positive manual P 156 8.4804 128 -0.07 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MGAB.HHN. ML:1.4 0.00018099999999999998 0.32 AML other m 2020-04-08T16:54:11.35
IV.SACS.HHN. ML:1.6 0.0004755 0.62 AML other m 2020-04-08T16:54:05.68
IV.SACS.HNE. ML:1.7 0.00060486655 1.488 AML other m 2020-04-08T16:54:05.98
IV.SACS.HHE. ML:1.6 0.000576 1.34 AML other m 2020-04-08T16:54:05.98
TV.SF04.EHN. ML:1.3 0.00015099999999999998 0.26 AML other m 2020-04-08T16:54:07.63
TV.SF04.EHE. ML:1.3 0.0001474 0.48 AML other m 2020-04-08T16:54:08.82
IV.MGAB.HHE. ML:1.6 0.00026349999999999995 0.42 AML other m 2020-04-08T16:54:09.70
IV.MGAB.HNN. ML:1.3 0.0001565 0.42 AML other m 2020-04-08T16:54:11.34
IV.ARCI.HHN. ML:0.9 0.0000354 0.36 AML other m 2020-04-08T16:54:12.02
IV.ARCI.HHE. ML:0.9 0.00003255 0.6 AML other m 2020-04-08T16:54:13.11
IV.MURB.HHE. ML:1.8 0.00011649999999999999 1.32 AML other m 2020-04-08T16:54:22.21
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