Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 13-05-2020 and time 08:41:31 (UTC) in region 4 km E Arlena di Castro (VT)

A magnitude ML 1.4 earthquake occured in region: 4 km E Arlena di Castro (VT), on

  • 13-05-2020 08:41:31 (UTC)
  • 13-05-2020 10:41:31 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.4550, 11.8730 at 9 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
Arlena di Castro VT 4 854 854
Tuscania VT 4 8451 9305
Tessennano VT 7 345 9650
Piansano VT 8 2079 11729
Marta VT 10 3499 15228
Canino VT 10 5286 20514
Cellere VT 11 1188 21702
Capodimonte VT 11 1731 23433
Valentano VT 14 2868 26301
Ischia di Castro VT 14 2326 28627
Montefiascone VT 16 13432 42059
Farnese VT 16 1527 43586
Latera VT 20 836 44422
Viterbo VT 20 67173 111595

Municipalities with at least 50000 inhabitants

An earthquake occurred to
20 Km W of Viterbo (67173 inhabitants)
41 Km N of Civitavecchia (52991 inhabitants)
65 Km W of Terni (111501 inhabitants)
71 Km E of Grosseto (82087 inhabitants)
80 Km NW of Roma (2864731 inhabitants)
82 Km NW of Fiumicino (78395 inhabitants)
84 Km SW of Perugia (166134 inhabitants)
87 Km NW of Guidonia Montecelio (88673 inhabitants)
88 Km SW of Foligno (57155 inhabitants)
94 Km NW of Tivoli (56533 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 2020-05-13
08:41:31		 42.4548 11.873 9 2020-11-19
12:37:05		 Bollettino Sismico Italiano INGV 84055931
Reviewed
Rev100 		ML 1.4 2020-05-13
08:41:31		 42.456 11.868 9 2020-05-13
08:54:03		 Sala Sismica INGV-Roma 79094401
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-05-13 08:41:31 ± 0.08
Latitude 42.4548 ± 0.0045
Longitude 11.8730 ± 0.0098
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 84055931

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 820
Semi-minor axis of confidence ellipse (meter) 182
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 66
Circular confidence region, given by single value of horizontal uncertainty (meter) 820.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 158
Number of associated phases, regardless of their use for origin computation 35
Number of defining phases 20
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.61963
Number of stations at which the event was observed 24
Number of stations from which data was used for origin computation 10
Magnitudes information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.2
Num. used stations 12
Type of magnitude ML
Reference to an origin 84055931
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-10-23 13:06:07

ML:1.4

Field Value
Value 1.4
Uncertainty 0.2
Num. used stations 12
Type of magnitude ML
Reference to an origin 79094401
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-05-13 08:54:03
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CET2.HHZ. 2020-05-13T08:43:24.72 3.0 undecidable manual Sg 11.27 0
IV.EUCT.HNZ. 2020-05-13T08:43:21.24 3.0 undecidable manual Sg 8.82 0
GU.CANO.HHZ. 2020-05-13T08:43:14.66 3.0 undecidable manual Sg 3.76 0
IV.QLNO.HHZ. 2020-05-13T08:43:04.21 3.0 undecidable manual Sn -6.32 0
IV.MNTV.HNZ. 2020-05-13T08:42:58.50 3.0 undecidable manual Sg 4.38 0
AC.VLO.HHZ. 2020-05-13T08:42:49.91 3.0 negative manual Pn 0.65 0
IV.MFNL.HHZ. 2020-05-13T08:42:35.16 3.0 negative manual Pn -3.25 0
IV.EUCT.HNZ. 2020-05-13T08:42:32.60 3.0 positive manual Pg 6.54 0
IV.PIPA.HHZ. 2020-05-13T08:42:29.95 3.0 negative manual Pn -3.24 0
GU.RORO.HHZ. 2020-05-13T08:42:20.91 3.0 negative manual Pn -5.27 0
IV.RAVA.EHZ. 2020-05-13T08:42:06.76 3.0 negative manual Pg -2.75 0
IV.IMOL.HNZ. 2020-05-13T08:42:02.24 3.0 undecidable manual Pn 0.23 0
IV.OSSC.HHZ. 2020-05-13T08:41:55.76 3.0 undecidable manual P 0.69 0
IV.MOMA.HNN. 2020-05-13T08:41:52.87 1.0 undecidable manual S 56 68.7756 50 -0.27 22
IV.LPEL.HHZ. 2020-05-13T08:41:51.34 3.0 negative manual Pn 1.23 0
IV.ARCI.HHZ. 2020-05-13T08:41:49.68 0.6 undecidable manual S 324 54.7008 50 0.31 45
IV.MGAB.HHZ. 2020-05-13T08:41:49.68 0.6 undecidable manual S 21 54.4011 50 0.39 44
TV.SF13.HHN. 2020-05-13T08:41:46.51 0.6 undecidable manual S 333 45.3213 50 -0.36 45
IV.SACS.HHZ. 2020-05-13T08:41:46.50 0.6 undecidable manual S 4 43.8228 50 0.03 48
IV.TOLF.HHZ. 2020-05-13T08:41:46.85 0.6 undecidable manual S 166 44.622 50 0.17 47
TV.SF04.EHZ. 2020-05-13T08:41:46.71 0.6 undecidable manual S 338 45.621 50 -0.25 46
TV.SF14.HHZ. 2020-05-13T08:41:44.92 0.3 undecidable manual S 328 39.4272 50 -0.37 68
IV.MOMA.HNN. 2020-05-13T08:41:44.32 0.3 undecidable manual P 56 68.7756 50 0.18 67
IV.MF5.EHZ. 2020-05-13T08:41:42.92 3.0 positive manual P 0.28 0
IV.ARCI.HHZ. 2020-05-13T08:41:42.55 0.3 undecidable manual P 324 54.7008 50 0.58 62
IV.MGAB.HHZ. 2020-05-13T08:41:41.80 0.3 undecidable manual P 21 54.4011 50 -0.12 70
IV.BARO.EHZ. 2020-05-13T08:41:41.73 0.3 undecidable manual S 147 27.2505 108 -0.07 74
IV.TOLF.HHZ. 2020-05-13T08:41:40.23 0.1 undecidable manual P 166 44.622 50 -0.18 94
TV.SF04.EHZ. 2020-05-13T08:41:40.62 0.3 undecidable manual P 338 45.621 50 0.05 72
TV.SF13.HHN. 2020-05-13T08:41:40.67 0.3 undecidable manual P 333 45.3213 50 0.15 71
IV.SACS.HHZ. 2020-05-13T08:41:40.07 0.1 undecidable manual P 4 43.8228 50 -0.22 93
TV.SF14.HHZ. 2020-05-13T08:41:39.68 0.1 undecidable manual P 328 39.4272 50 0.07 97
IV.LATE.HHZ. 2020-05-13T08:41:38.86 0.6 undecidable manual S 342 18.4704 116 -0.13 50
IV.BARO.EHZ. 2020-05-13T08:41:37.58 0.1 undecidable manual P 147 27.2505 108 -0.02 100
IV.LATE.HHZ. 2020-05-13T08:41:36.08 0.3 undecidable manual P 342 18.4704 116 0.1 75
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.LATE.HHE. ML:1.0 0.00008276122999999999 0.1792 AML other m 2020-05-13T08:41:39.52
IV.LATE.HHN. ML:1.3 0.00016273860000000001 0.8448 AML other m 2020-05-13T08:41:39.34
IV.BARO.HNN. ML:1.6 0.00024680941 0.2688 AML other m 2020-05-13T08:41:41.96
IV.BARO.HNE. ML:1.8 0.00030336805 1.6864 AML other m 2020-05-13T08:41:41.90
IV.TOLF.HHN. ML:1.6 0.000111149465 1.68 AML other m 2020-05-13T08:41:47.04
IV.SACS.HHN. ML:1.2 0.00004815307 0.2816 AML other m 2020-05-13T08:41:47.28
TV.SF04.EHE. ML:1.4 0.000068796375 0.16 AML other m 2020-05-13T08:41:47.71
IV.SACS.HHE. ML:1.3 0.0000614695 0.2432 AML other m 2020-05-13T08:41:47.78
IV.TOLF.HHE. ML:1.4 0.000085912475 0.2432 AML other m 2020-05-13T08:41:47.78
TV.SF04.EHN. ML:1.3 0.0000587075205 0.1408 AML other m 2020-05-13T08:41:48.16
IV.MGAB.HHN. ML:1.3 0.000049452609999999995 0.4032 AML other m 2020-05-13T08:41:49.73
IV.MGAB.HNN. ML:1.3 0.00005013099 0.3968 AML other m 2020-05-13T08:41:49.73
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