Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 17-04-2021 and time 22:18:56 (Italy) in region 3 km NW Preci (PG)

A magnitude ML 1.4 earthquake occured in region: 3 km NW Preci (PG), on

  • 17-04-2021 20:18:56 (UTC)
  • 17-04-2021 22:18:56 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.9040, 13.0230 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
Preci PG 3 724 724
Visso MC 6 1107 1831
Sellano PG 8 1079 2910
Monte Cavallo MC 10 145 3055
Ussita MC 11 444 3499
Castelsantangelo sul Nera MC 11 281 3780
Cerreto di Spoleto PG 13 1075 4855
Norcia PG 14 4957 9812
Pieve Torina MC 16 1458 11270
Fiordimonte MC 16 202 11472
Pievebovigliana MC 18 866 12338
Fiastra MC 18 559 12897
Acquacanina MC 19 121 13018
Bolognola MC 20 142 13160
Serravalle di Chienti MC 20 1070 14230
Vallo di Nera PG 20 364 14594
Muccia MC 20 915 15509

Municipalities with at least 50000 inhabitants

An earthquake occurred to
27 Km E of Foligno (57155 inhabitants)
49 Km NE of Terni (111501 inhabitants)
56 Km E of Perugia (166134 inhabitants)
62 Km W of Teramo (54892 inhabitants)
69 Km NW of L'Aquila (69753 inhabitants)
89 Km SW of Ancona (100861 inhabitants)
92 Km NE of Viterbo (67173 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 1.4 2021-04-17
20:18:56		 42.9038 13.023 10 2021-04-17
20:25:54		 Sala Sismica INGV-Roma 89187881
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-17 20:18:56 ± 0.06
Latitude 42.9038 ± 0.0036
Longitude 13.0230 ± 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 89187881

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 361
Semi-minor axis of confidence ellipse (meter) 291
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 36
Circular confidence region, given by single value of horizontal uncertainty (meter) 360.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 49
Number of associated phases, regardless of their use for origin computation 29
Number of defining phases 29
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) 0.09173
Epicentral distance of station farthest from the epicenter (degree) 0.51081
Number of stations at which the event was observed 16
Number of stations from which data was used for origin computation 16
Magnitude information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.3
Num. used stations 26
Type of magnitude ML
Reference to an origin 89187881
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-17 20:25:54
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.TERO.HHZ. 2021-04-17T20:19:14.09 0.3 undecidable manual S 123 56.6988 50 -0.08 73
IV.ATCC.EHZ. 2021-04-17T20:19:11.05 0.3 undecidable manual S 315 44.0226 50 0.24 72
IV.MOMA.HHZ. 2021-04-17T20:19:09.85 0.3 undecidable manual S 253 38.4282 50 0.53 68
IV.MF5.EHZ. 2021-04-17T20:19:09.47 0.3 undecidable manual S 75 36.6411 50 0.63 66
IV.SMA1.EHZ. 2021-04-17T20:19:09.41 0.3 undecidable manual S 140 39.5271 50 -0.21 73
IV.ASSB.HHZ. 2021-04-17T20:19:07.71 0.3 undecidable manual S 298 33.3444 50 -0.24 73
IV.TERO.HHZ. 2021-04-17T20:19:06.60 0.1 undecidable manual P 123 56.6988 50 -0.05 98
IV.MNTT.EHZ. 2021-04-17T20:19:06.09 0.6 positive manual P 69 49.7169 50 0.52 45
IV.RM33.EHZ. 2021-04-17T20:19:05.23 1.0 undecidable manual P 160 46.5201 50 0.14 24
IV.CSP1.EHZ. 2021-04-17T20:19:05.46 0.6 undecidable manual S 35 25.5522 50 -0.41 48
IV.GAVE.EHZ. 2021-04-17T20:19:05.81 0.3 undecidable manual S 204 25.752 50 -0.1 77
IV.ATCC.EHZ. 2021-04-17T20:19:04.61 0.6 negative manual P 315 44.0226 50 -0.1 50
IV.MF5.EHZ. 2021-04-17T20:19:03.66 0.3 positive manual P 75 36.6411 50 0.09 75
IV.SMA1.EHZ. 2021-04-17T20:19:03.80 1.0 negative manual P 140 39.5271 50 -0.22 24
IV.MOMA.HHZ. 2021-04-17T20:19:03.90 0.6 negative manual P 253 38.4282 50 0.05 50
IV.CESI.HHZ. 2021-04-17T20:19:02.75 0.6 undecidable manual S 319 14.7741 124 0.17 51
IV.ASSB.HHZ. 2021-04-17T20:19:02.81 0.3 positive manual P 298 33.3444 50 -0.25 73
IV.LNSS.HHZ. 2021-04-17T20:19:02.93 0.1 undecidable manual P 178 33.4443 50 -0.14 100
IV.MC2.EHZ. 2021-04-17T20:19:02.43 0.6 undecidable manual S 86 13.4754 127 0.2 51
IV.FDMO.HHZ. 2021-04-17T20:19:02.57 0.6 undecidable manual S 19 15.5733 123 -0.26 50
IT.MTCL.HGZ. 2021-04-17T20:19:01.24 0.6 undecidable manual S 349 10.1787 135 -0.11 52
IV.NRCA.HNZ. 2021-04-17T20:19:01.44 0.6 undecidable manual S 136 10.7781 133 -0.06 53
IV.CSP1.EHZ. 2021-04-17T20:19:01.51 0.3 positive manual P 35 25.5522 50 -0.35 73
IV.GAVE.EHZ. 2021-04-17T20:19:01.83 0.3 positive manual P 204 25.752 50 -0.05 77
IV.FDMO.HHZ. 2021-04-17T20:19:00.04 0.3 negative manual P 19 15.5733 123 -0.06 79
IV.CESI.HHZ. 2021-04-17T20:19:00.07 1.0 undecidable manual P 319 14.7741 124 0.11 26
IT.MTCL.HGZ. 2021-04-17T20:18:59.38 0.6 undecidable manual P 349 10.1787 135 0.14 52
IV.NRCA.HNZ. 2021-04-17T20:18:59.42 0.3 positive manual P 136 10.7781 133 0.09 79
IV.MC2.EHZ. 2021-04-17T20:18:59.81 1.0 negative manual P 86 13.4754 127 0.06 26
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HNN. ML:2.2 0.0017349999999999998 0.1 AML other m 2021-04-17T20:19:01.51
IV.NRCA.HHN. ML:2.2 0.0018450000000000003 0.08 AML other m 2021-04-17T20:19:01.50
IV.NRCA.HHE. ML:1.9 0.0010509999999999999 0.08 AML other m 2021-04-17T20:19:01.79
IV.NRCA.HNE. ML:1.9 0.0010474651 0.0896 AML other m 2021-04-17T20:19:01.79
IV.FDMO.HHN. ML:1.4 0.000237 0.3 AML other m 2021-04-17T20:19:02.88
IV.FDMO.HHE. ML:1.5 0.00028099999999999995 0.14 AML other m 2021-04-17T20:19:02.89
IV.CESI.HHN. ML:1.7 0.000524 1.76 AML other m 2021-04-17T20:19:02.05
IV.CESI.HHE. ML:1.5 0.00029252334999999995 0.2048 AML other m 2021-04-17T20:19:03.05
IV.GAVE.EHE. ML:1.5 0.0001875 1.82 AML other m 2021-04-17T20:19:06.99
IV.CSP1.EHN. ML:1.6 0.0002557718 0.32 AML other m 2021-04-17T20:19:06.09
IV.GAVE.EHN. ML:1.3 0.000113754375 0.128 AML other m 2021-04-17T20:19:07.36
IV.CSP1.EHE. ML:1.5 0.00017509954999999998 0.1792 AML other m 2021-04-17T20:19:07.21
IV.ASSB.HHE. ML:1.3 0.0000894 1.82 AML other m 2021-04-17T20:19:07.00
IV.ASSB.HHN. ML:1.2 0.00007615 0.12 AML other m 2021-04-17T20:19:08.24
IV.LNSS.HHN. ML:1.2 0.0000748 0.12 AML other m 2021-04-17T20:19:08.69
IV.LNSS.HHE. ML:1.1 0.00005735 0.14 AML other m 2021-04-17T20:19:09.35
IV.MOMA.HHE. ML:1.3 0.0000708 0.16 AML other m 2021-04-17T20:19:11.32
IV.MOMA.HHN. ML:1.0 0.000042 0.5 AML other m 2021-04-17T20:19:11.52
IV.SMA1.EHN. ML:0.9 0.000023202225 0.1664 AML other m 2021-04-17T20:19:11.03
IV.SMA1.EHE. ML:1.0 0.000033136928500000006 0.2816 AML other m 2021-04-17T20:19:14.32
IV.TERO.HHE. ML:1.0 0.00002375 0.08 AML other m 2021-04-17T20:19:15.50
IV.TERO.HHN. ML:1.0 0.000024 1.52 AML other m 2021-04-17T20:19:16.08
IV.GAVE.HNE. ML:1.6 0.00020345593500000001 0.192 AML other m 2021-04-17T20:19:05.98
IV.MF5.EHE. ML:1.4 0.000090293765 0.1792 AML other m 2021-04-17T20:19:10.11
IV.MF5.EHN. ML:1.2 0.000062135275 0.0896 AML other m 2021-04-17T20:19:10.08
IV.MOMA.HNE. ML:1.5 0.00011114039000000001 0.7424 AML other m 2021-04-17T20:19:14.50
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