Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.8 on date 22-04-2021 and time 06:02:07 (Italy) in region 7 km SW Preci (PG)

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

  • 22-04-2021 04:02:07 (UTC)
  • 22-04-2021 06:02:07 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8220, 13.0050 at 11 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
Preci PG 7 724 724
Cerreto di Spoleto PG 7 1075 1799
Norcia PG 8 4957 6756
Sellano PG 10 1079 7835
Cascia PG 12 3217 11052
Vallo di Nera PG 13 364 11416
Poggiodomo PG 13 117 11533
Visso MC 14 1107 12640
Castelsantangelo sul Nera MC 15 281 12921
Sant'Anatolia di Narco PG 17 564 13485
Ussita MC 18 444 13929
Campello sul Clitunno PG 19 2442 16371
Scheggino PG 19 461 16832
Monte Cavallo MC 19 145 16977
Monteleone di Spoleto PG 19 599 17576

Municipalities with at least 50000 inhabitants

An earthquake occurred to
29 Km SE of Foligno (57155 inhabitants)
41 Km NE of Terni (111501 inhabitants)
59 Km SE of Perugia (166134 inhabitants)
60 Km W of Teramo (54892 inhabitants)
61 Km NW of L'Aquila (69753 inhabitants)
86 Km NE of Viterbo (67173 inhabitants)
94 Km N of Guidonia Montecelio (88673 inhabitants)
97 Km N of Tivoli (56533 inhabitants)
98 Km SW of Ancona (100861 inhabitants)
100 Km W of Montesilvano (53738 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 2021-04-22
04:02:07		 42.8222 13.0048 11 2021-04-22
04:16:20		 Sala Sismica INGV-Roma 89347411
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-22 04:02:07 ± 0.03
Latitude 42.8222 ± 0.0027
Longitude 13.0048 ± 0.0061
Depth (km) 11 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 89347411

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 431
Semi-minor axis of confidence ellipse (meter) 272
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 295
Circular confidence region, given by single value of horizontal uncertainty (meter) 430.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 126
Number of associated phases, regardless of their use for origin computation 14
Number of defining phases 13
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.09
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.30667
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 0.1
Num. used stations 6
Type of magnitude ML
Reference to an origin 89347411
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-22 04:16:20
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CRTC.HHZ. 2021-04-22T04:02:38.46 3.0 undecidable manual S -0.04 0
IV.MMO1.EHZ. 2021-04-22T04:02:16.85 0.6 undecidable manual S 72 27.5502 50 -0.09 50
IV.FDMO.HHZ. 2021-04-22T04:02:16.06 0.6 undecidable manual S 16 24.753 50 -0.13 50
IV.LNSS.HHZ. 2021-04-22T04:02:15.95 0.6 undecidable manual S 173 24.4533 50 -0.18 49
IV.CESI.HHZ. 2021-04-22T04:02:15.25 0.6 undecidable manual S 338 21.867 50 -0.17 49
IV.MC2.EHZ. 2021-04-22T04:02:14.35 0.6 undecidable manual S 56 17.9709 121 0.03 50
IV.GAVE.EHZ. 2021-04-22T04:02:13.96 0.6 undecidable manual S 212 16.9719 122 -0.08 50
IV.CSP1.EHZ. 2021-04-22T04:02:13.73 0.6 positive manual P 28 34.0437 50 -0.04 49
IV.FDMO.HHZ. 2021-04-22T04:02:12.25 0.3 positive manual P 16 24.753 50 -0.08 75
IV.LNSS.HHZ. 2021-04-22T04:02:12.27 0.1 undecidable manual P 173 24.4533 50 -0.03 100
IV.MMO1.EHZ. 2021-04-22T04:02:12.68 1.0 positive manual P 72 27.5502 50 -0.09 25
IV.GAVE.EHZ. 2021-04-22T04:02:11.19 0.1 positive manual P 212 16.9719 122 0.1 100
IV.MC2.EHZ. 2021-04-22T04:02:11.40 1.0 negative manual P 56 17.9709 121 0.15 25
IV.CESI.HHZ. 2021-04-22T04:02:11.95 0.6 negative manual P 338 21.867 50 0.06 49
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CESI.HHN. ML:1.0 0.00006110000000000001 0.34 AML other m 2021-04-22T04:02:15.50
IV.CESI.HHE. ML:0.6 0.000028650000000000002 1.02 AML other m 2021-04-22T04:02:15.93
IV.LNSS.HHN. ML:0.9 0.0000487 0.22 AML other m 2021-04-22T04:02:16.44
IV.FDMO.HHN. ML:0.6 0.00002675 0.22 AML other m 2021-04-22T04:02:16.62
IV.LNSS.HHE. ML:0.9 0.00004645 1.4 AML other m 2021-04-22T04:02:16.79
IV.FDMO.HHE. ML:0.8 0.000034250000000000006 1.42 AML other m 2021-04-22T04:02:16.86
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