Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.5 on date 20-04-2021 and time 19:26:23 (UTC) in region 1 km E Pietralunga (PG)

A magnitude ML 0.5 earthquake occured in region: 1 km E Pietralunga (PG), on

  • 20-04-2021 19:26:23 (UTC)
  • 20-04-2021 21:26:23 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.4430, 12.4480 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.

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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
Pietralunga PG 1 2111 2111
Montone PG 13 1680 3791
Apecchio PU 13 1882 5673
Gubbio PG 15 32216 37889
Cantiano PU 15 2245 40134
Città di Castello PG 17 39913 80047
Piobbico PU 17 2029 82076
Umbertide PG 18 16681 98757
Scheggia e Pascelupo PG 18 1393 100150

Municipalities with at least 50000 inhabitants

An earthquake occurred to
38 Km N of Perugia (166134 inhabitants)
46 Km E of Arezzo (99543 inhabitants)
58 Km NW of Foligno (57155 inhabitants)
64 Km SW of Pesaro (94582 inhabitants)
64 Km SW of Fano (60888 inhabitants)
70 Km S of Rimini (147750 inhabitants)
79 Km S of Cesena (96758 inhabitants)
89 Km W of Ancona (100861 inhabitants)
91 Km E of Siena (53903 inhabitants)
93 Km SE of Forlì (117913 inhabitants)
99 Km N of Terni (111501 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 0.5 2021-04-20
19:26:23		 43.4427 12.4477 7 2021-04-20
19:30:52		 Sala Sismica INGV-Roma 89305491
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-20 19:26:23 ± 0.19
Latitude 43.4427 ± 0.0045
Longitude 12.4477 ± 0.0062
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 89305491

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 517
Semi-minor axis of confidence ellipse (meter) 148
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 75
Circular confidence region, given by single value of horizontal uncertainty (meter) 520.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 121
Number of associated phases, regardless of their use for origin computation 14
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.25
Epicentral distance of station closest to the epicenter (degree) 0.03417
Epicentral distance of station farthest from the epicenter (degree) 0.21494
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitude information

ML:0.5

Field Value
Value 0.5
Uncertainty 0.2
Num. used stations 12
Type of magnitude ML
Reference to an origin 89305491
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-20 19:30:52
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.FRON.EHZ. 2021-04-20T19:26:32.46 0.6 undecidable manual S 69 23.8539 106 -0.1 49
IV.BADI.EHZ. 2021-04-20T19:26:31.04 0.6 undecidable manual S 295 17.9709 111 0.43 46
IV.MURB.HHZ. 2021-04-20T19:26:31.98 0.3 undecidable manual S 163 20.868 108 0.42 69
IV.NARO.HHZ. 2021-04-20T19:26:31.68 0.3 undecidable manual S 30 21.5673 108 -0.09 74
IV.PIEI.HHZ. 2021-04-20T19:26:29.38 0.3 undecidable manual S 34 12.4764 119 0.5 68
IV.ATFO.HHZ. 2021-04-20T19:26:29.11 0.3 undecidable manual S 130 13.0758 118 0.05 75
IV.MURB.HHZ. 2021-04-20T19:26:28.20 0.1 undecidable manual P 163 20.868 108 -0.13 97
IV.NARO.HHZ. 2021-04-20T19:26:28.28 0.1 undecidable manual P 30 21.5673 108 -0.17 96
IV.FRON.EHZ. 2021-04-20T19:26:28.66 0.1 undecidable manual P 69 23.8539 106 -0.26 94
IV.PIEI.HHZ. 2021-04-20T19:26:27.00 0.1 positive manual P 34 12.4764 119 0.21 97
IV.BADI.EHZ. 2021-04-20T19:26:27.81 0.1 undecidable manual P 295 17.9709 111 0.03 100
IV.ATFO.HHZ. 2021-04-20T19:26:26.79 0.1 undecidable manual P 130 13.0758 118 -0.1 99
IV.ATPI.EHZ. 2021-04-20T19:26:26.24 0.6 undecidable manual S 284 3.7962 151 -0.41 47
IV.ATPI.EHZ. 2021-04-20T19:26:25.31 0.1 undecidable manual P 284 3.7962 151 -0.19 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ATFO.HHE. ML:0.3 0.0000234 0.62 AML other m 2021-04-20T19:26:29.29
IV.PIEI.HHN. ML:0.8 0.00007664999999999999 0.14 AML other m 2021-04-20T19:26:29.73
IV.PIEI.HHE. ML:0.8 0.0000782 0.12 AML other m 2021-04-20T19:26:29.75
IV.BADI.EHE. ML:0.6 0.00003465 0.88 AML other m 2021-04-20T19:26:31.13
IV.BADI.EHN. ML:0.6 0.000034699999999999996 0.82 AML other m 2021-04-20T19:26:31.18
IV.NARO.HHE. ML:0.3 0.00001495 1.38 AML other m 2021-04-20T19:26:32.00
IV.MURB.HHE. ML:0.8 0.000042550000000000004 0.34 AML other m 2021-04-20T19:26:32.12
IV.ATFO.HHN. ML:0.2 0.000022499999999999998 0.72 AML other m 2021-04-20T19:26:32.98
IV.FRON.EHN. ML:0.5 0.000018950000000000003 0.5 AML other m 2021-04-20T19:26:32.65
IV.FRON.EHE. ML:0.4 0.000013205 0.74 AML other m 2021-04-20T19:26:32.76
IV.NARO.HHN. ML:0.3 0.00001365 0.88 AML other m 2021-04-20T19:26:33.68
IV.MURB.HHN. ML:0.6 0.0000297 0.86 AML other m 2021-04-20T19:26:35.26
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