Istituto Nazionale di Geofisica e Vulcanologia

Earthquake (quarry blast) with magnitude of ML 0.8 on date 20-04-2021 and time 15:17:05 (Italy) in region 4 km E Genga (AN)

A magnitude ML 0.8 (quarry blast) earthquake occured in region: 4 km E Genga (AN), on

  • 20-04-2021 13:17:05 (UTC)
  • 20-04-2021 15:17:05 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.4180, 12.9830 at 0 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

Event type: quarry blast.

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
Genga AN 4 1797 1797
Serra San Quirico AN 4 2850 4647
Mergo AN 8 1037 5684
Poggio San Vicino MC 9 246 5930
Arcevia AN 10 4612 10542
Rosora AN 10 1985 12527
Sassoferrato AN 10 7285 19812
Cerreto d'Esi AN 11 3817 23629
Fabriano AN 11 31480 55109
Cupramontana AN 11 4756 59865
Castelplanio AN 12 3540 63405
Apiro MC 12 2280 65685
Maiolati Spontini AN 13 6248 71933
Poggio San Marcello AN 13 693 72626
Montecarotto AN 14 1987 74613
Monte Roberto AN 15 3061 77674
Serra de' Conti AN 15 3746 81420
Castelbellino AN 15 4947 86367
San Paolo di Jesi AN 16 933 87300
Staffolo AN 17 2253 89553
Matelica MC 18 9981 99534
Barbara AN 19 1368 100902
Esanatoglia MC 19 2034 102936
Serra Sant'Abbondio PU 19 1027 103963
Cingoli MC 20 10352 114315

Municipalities with at least 50000 inhabitants

An earthquake occurred to
48 Km S of Fano (60888 inhabitants)
49 Km W of Ancona (100861 inhabitants)
55 Km S of Pesaro (94582 inhabitants)
56 Km NE of Foligno (57155 inhabitants)
59 Km NE of Perugia (166134 inhabitants)
79 Km SE of Rimini (147750 inhabitants)
89 Km E of Arezzo (99543 inhabitants)
99 Km N of Terni (111501 inhabitants)
100 Km SE of Cesena (96758 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 0.8 2021-04-20
13:17:05		 43.4178 12.9832 1 2021-07-12
16:55:16		 Bollettino Sismico Italiano INGV 91700171
Reviewed
Rev100 		ML 0.9 2021-04-20
13:17:05		 43.4422 13.002 7 2021-04-20
13:28:07		 Sala Sismica INGV-Roma 89294891
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-20 13:17:05 ± 0.11
Latitude 43.4178 ± 0.0063
Longitude 12.9832 ± 0.0111
Depth (km) 1 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type quarry blast
Origin ID 91700171

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 950
Semi-minor axis of confidence ellipse (meter) 650
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 239
Circular confidence region, given by single value of horizontal uncertainty (meter) 950.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 82
Number of associated phases, regardless of their use for origin computation 34
Number of defining phases 11
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.31
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.38851
Number of stations at which the event was observed 34
Number of stations from which data was used for origin computation 11
Magnitudes information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.1
Num. used stations 10
Type of magnitude ML
Reference to an origin 91700171
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-06-22 09:19:45

ML:0.9

Field Value
Value 0.9
Uncertainty 0.4
Num. used stations 16
Type of magnitude ML
Reference to an origin 89294891
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-20 13:28:07
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.VOBA.EHZ. 2021-04-20T13:18:38.92 3.0 undecidable manual Sg 13.48 0
IV.LPDG.HHZ. 2021-04-20T13:18:25.85 3.0 undecidable manual Pn -6.59 0
IV.FREG.EHZ. 2021-04-20T13:18:20.27 3.0 undecidable manual Sn -1.98 0
IV.MSRU.HHZ. 2021-04-20T13:18:10.75 3.0 positive manual Pg 11.13 0
IV.NDIM.HNZ. 2021-04-20T13:18:07.81 3.0 undecidable manual Sn 1.27 0
IV.MUCR.HHZ. 2021-04-20T13:18:00.30 3.0 positive manual Pn 0.01 0
IV.MSFR.HHZ. 2021-04-20T13:17:58.63 3.0 undecidable manual Pn -1.03 0
OT.OT05.EHZ. 2021-04-20T13:17:58.32 3.0 undecidable manual Sg 9.37 0
IV.MCT.HHZ. 2021-04-20T13:17:54.79 3.0 undecidable manual Pn -8.93 0
IV.ZEN8.EHZ. 2021-04-20T13:17:54.53 3.0 undecidable manual Pg 11.72 0
IV.VULT.HHZ. 2021-04-20T13:17:53.28 3.0 undecidable manual Sn -5.85 0
MN.TRI.HHZ. 2021-04-20T13:17:51.68 3.0 negative manual Pg 13.86 0
IV.VISG.HHZ. 2021-04-20T13:17:51.44 3.0 undecidable manual Sn 3.82 0
OT.OT14.EHZ. 2021-04-20T13:17:47.38 3.0 undecidable manual Sn -4.17 0
IV.SGTA.HHZ. 2021-04-20T13:17:44.43 3.0 undecidable manual Sn -8.4 0
IV.SLCN.HHZ. 2021-04-20T13:17:40.60 3.0 undecidable manual Pg 5.62 0
IV.BRSN.EHZ. 2021-04-20T13:17:38.89 3.0 undecidable manual Sn -4.67 0
IV.VBKN.HHZ. 2021-04-20T13:17:29.92 3.0 negative manual Pg 6.79 0
IV.CSNT.HHZ. 2021-04-20T13:17:18.03 3.0 positive manual Pn 0.54 0
IV.CAFE.HHZ. 2021-04-20T13:17:18.24 3.0 undecidable manual Pn -7.55 0
IV.SRES.HHZ. 2021-04-20T13:17:15.36 3.0 undecidable manual Sn -0.8 0
IV.MMO1.EHZ. 2021-04-20T13:17:15.00 3.0 undecidable manual Sg 3.75 0
IV.FDMO.HHZ. 2021-04-20T13:17:14.10 0.3 undecidable manual P 169 43.1235 91 -0.47 64
IV.CSP1.EHZ. 2021-04-20T13:17:13.54 0.3 undecidable manual P 154 40.3263 91 -0.48 64
IV.PIEI.HHZ. 2021-04-20T13:17:13.32 0.3 undecidable manual P 290 38.3283 91 -0.3 67
IV.ATCC.EHZ. 2021-04-20T13:17:13.61 0.3 undecidable manual P 227 37.8288 91 0.09 70
IV.MPAG.EHZ. 2021-04-20T13:17:11.53 0.3 undecidable manual P 323 29.5482 91 -0.32 68
IV.FRON.EHZ. 2021-04-20T13:17:10.94 0.3 undecidable manual P 298 23.4543 91 0.3 69
IV.SNTG.HHZ. 2021-04-20T13:17:10.20 0.3 undecidable manual P 191 18.3705 92 0.58 64
IV.CING.HNE. 2021-04-20T13:17:09.58 0.1 undecidable manual P 105 17.7711 92 0.09 97
IV.EL6.EHZ. 2021-04-20T13:17:08.90 0.3 undecidable manual P 136 13.6752 92 0.22 71
IV.ARVD.HHZ. 2021-04-20T13:17:07.92 0.1 undecidable manual P 339 9.4794 93 0.09 98
IV.LPEL.HHZ. 2021-04-20T13:17:06.90 3.0 positive manual P -2.18 0
IV.MMUR.HNZ. 2021-04-20T13:17:06.56 0.1 positive manual P 23 2.8971 100 0.04 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.EL6.EHE. ML:1.0 0.000136 0.4 AML other m 2021-04-20T13:17:14.20
IV.EL6.EHN. ML:1.0 0.00012529999999999998 0.9 AML other m 2021-04-20T13:17:14.33
IV.FRON.EHE. ML:0.7 0.00003665 0.72 AML other m 2021-04-20T13:17:19.44
IV.PIEI.HHE. ML:0.7 0.0000202 0.94 AML other m 2021-04-20T13:17:20.81
IV.FDMO.HHE. ML:0.7 0.000012835 1 AML other m 2021-04-20T13:17:22.24
IV.PIEI.HHN. ML:0.6 0.00001605 0.42 AML other m 2021-04-20T13:17:23.13
IV.FDMO.HHN. ML:0.7 0.000016300000000000003 0.7 AML other m 2021-04-20T13:17:23.53
IV.FRON.EHN. ML:0.8 0.0000468 0.94 AML other m 2021-04-20T13:17:24.36
IV.MPAG.EHN. ML:0.8 0.00002855 0.7 AML other m 2021-04-20T13:17:25.45
IV.MPAG.EHE. ML:0.7 0.0000234 1.1 AML other m 2021-04-20T13:17:29.75
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