Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.8 on date 11-04-2021 and time 04:37:39 (UTC) in region 7 km E Valtopina (PG)

A magnitude ML 0.8 earthquake occured in region: 7 km E Valtopina (PG), on

  • 11-04-2021 04:37:39 (UTC)
  • 11-04-2021 06:37:39 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.0480, 12.8450 at 10 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.

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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
Valtopina PG 7 1398 1398
Nocera Umbra PG 8 5839 7237
Serravalle di Chienti MC 9 1070 8307
Sefro MC 14 422 8729
Monte Cavallo MC 14 145 8874
Foligno PG 15 57155 66029
Spello PG 15 8645 74674
Muccia MC 17 915 75589
Pieve Torina MC 17 1458 77047
Fiuminata MC 17 1402 78449
Pioraco MC 19 1134 79583
Assisi PG 19 28299 107882
Sellano PG 19 1079 108961
Pievebovigliana MC 20 866 109827

Municipalities with at least 50000 inhabitants

An earthquake occurred to
15 Km NE of Foligno (57155 inhabitants)
38 Km E of Perugia (166134 inhabitants)
57 Km N of Terni (111501 inhabitants)
82 Km NW of Teramo (54892 inhabitants)
84 Km SW of Ancona (100861 inhabitants)
90 Km S of Fano (60888 inhabitants)
90 Km NW of L'Aquila (69753 inhabitants)
91 Km SE of Arezzo (99543 inhabitants)
93 Km NE of Viterbo (67173 inhabitants)
96 Km S of Pesaro (94582 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
Reviewed
Rev100 		ML 0.8 2021-04-11
04:37:39		 43.0483 12.8453 10 2021-04-11
05:35:42		 Sala Sismica INGV-Roma 88994811
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-11 04:37:39 ± 0.04
Latitude 43.0483 ± 0.0036
Longitude 12.8453 ± 0.0037
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 88994811

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 420
Semi-minor axis of confidence ellipse (meter) 135
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 208
Circular confidence region, given by single value of horizontal uncertainty (meter) 420.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 131
Number of associated phases, regardless of their use for origin computation 15
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.1
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.29138
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 7
Magnitude information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 88994811
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-11 05:35:42
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.FIAM.HHZ. 2021-04-11T04:38:06.11 3.0 undecidable manual S -0.59 0
IV.NRCA.HHZ. 2021-04-11T04:37:50.98 0.6 undecidable manual S 137 32.3454 50 -0.08 48
IV.CSP1.EHZ. 2021-04-11T04:37:50.34 0.6 undecidable manual S 80 29.5482 50 0.03 49
IV.FOSV.EHZ. 2021-04-11T04:37:50.01 0.6 undecidable manual S 346 28.1496 50 0.06 48
IV.ATCC.EHZ. 2021-04-11T04:37:48.31 0.6 undecidable manual S 312 22.4553 114 0.05 49
IV.FDMO.HHZ. 2021-04-11T04:37:47.17 0.6 undecidable manual S 94 19.6692 117 -0.2 48
IV.NRCA.HHZ. 2021-04-11T04:37:46.31 1.0 undecidable manual P 137 32.3454 50 0.04 24
IV.CSP1.EHZ. 2021-04-11T04:37:45.76 0.3 positive manual P 80 29.5482 50 -0.08 72
IV.FOSV.EHZ. 2021-04-11T04:37:45.89 1.0 undecidable manual P 346 28.1496 50 0.27 23
IV.ASSB.HHZ. 2021-04-11T04:37:45.93 0.6 undecidable manual S 268 15.1737 123 -0.08 49
IV.FDMO.HHZ. 2021-04-11T04:37:44.16 0.3 positive manual P 94 19.6692 117 0.02 74
IV.ATCC.EHZ. 2021-04-11T04:37:44.49 0.3 positive manual P 312 22.4553 114 -0.16 72
IV.ASSB.HHZ. 2021-04-11T04:37:43.33 0.1 positive manual P 268 15.1737 123 -0.02 100
IV.CESI.HHZ. 2021-04-11T04:37:43.91 0.6 undecidable manual S 135 6.7932 146 0 51
IV.CESI.HHZ. 2021-04-11T04:37:42.34 0.1 undecidable manual P 135 6.7932 146 0.2 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CESI.HHN. ML:0.6 0.000052699999999999993 0.7 AML other m 2021-04-11T04:37:44.61
IV.CESI.HHE. ML:0.5 0.00004905 0.96 AML other m 2021-04-11T04:37:44.66
IV.ASSB.HHE. ML:0.7 0.000051699999999999996 0.26 AML other m 2021-04-11T04:37:46.59
IV.ASSB.HHN. ML:0.9 0.00006795000000000001 1.1 AML other m 2021-04-11T04:37:46.82
IV.FDMO.HHE. ML:1.0 0.00006914999999999999 0.12 AML other m 2021-04-11T04:37:47.45
IV.FDMO.HHN. ML:0.9 0.0000598 0.42 AML other m 2021-04-11T04:37:47.63
IV.NRCA.HHN. ML:0.9 0.000032850000000000006 0.14 AML other m 2021-04-11T04:37:51.37
IV.NRCA.HHE. ML:1.0 0.000038150000000000006 1.02 AML other m 2021-04-11T04:37:52.08
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