Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 16-04-2021 and time 04:55:18 (Italy) in region 4 km W Preci (PG)

A magnitude ML 1.7 earthquake occured in region: 4 km W Preci (PG), on

  • 16-04-2021 02:55:18 (UTC)
  • 16-04-2021 04:55:18 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8790, 12.9930 at 10 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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 4 724 724
Sellano PG 5 1079 1803
Cerreto di Spoleto PG 9 1075 2878
Visso MC 10 1107 3985
Norcia PG 13 4957 8942
Monte Cavallo MC 13 145 9087
Castelsantangelo sul Nera MC 13 281 9368
Ussita MC 14 444 9812
Vallo di Nera PG 16 364 10176
Cascia PG 18 3217 13393
Campello sul Clitunno PG 19 2442 15835
Pieve Torina MC 19 1458 17293
Poggiodomo PG 19 117 17410
Fiordimonte MC 19 202 17612
Trevi PG 20 8469 26081

Municipalities with at least 50000 inhabitants

An earthquake occurred to
25 Km E of Foligno (57155 inhabitants)
45 Km NE of Terni (111501 inhabitants)
55 Km E of Perugia (166134 inhabitants)
63 Km W of Teramo (54892 inhabitants)
67 Km NW of L'Aquila (69753 inhabitants)
89 Km NE of Viterbo (67173 inhabitants)
93 Km SW of Ancona (100861 inhabitants)
100 Km N of Guidonia Montecelio (88673 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 1.7 2021-04-16
02:55:18		 42.8793 12.9932 10 2021-07-12
16:55:07		 Bollettino Sismico Italiano INGV 89325541
Reviewed
Rev100 		ML 1.4 2021-04-16
02:55:18		 42.8792 12.9938 10 2021-04-16
03:07:24		 Sala Sismica INGV-Roma 89132321
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-16 02:55:18 ± 0.05
Latitude 42.8793 ± 0.0027
Longitude 12.9932 ± 0.0037
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 89325541

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 279
Semi-minor axis of confidence ellipse (meter) 272
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 51
Circular confidence region, given by single value of horizontal uncertainty (meter) 280.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 28
Number of associated phases, regardless of their use for origin computation 49
Number of defining phases 49
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.24
Epicentral distance of station closest to the epicenter (degree) 0.09263
Epicentral distance of station farthest from the epicenter (degree) 0.78960
Number of stations at which the event was observed 33
Number of stations from which data was used for origin computation 33
Magnitudes information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.2
Num. used stations 20
Type of magnitude ML
Reference to an origin 89132321
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-16 03:07:24

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations 42
Type of magnitude ML
Reference to an origin 89325541
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-06-14 14:21:37
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.VCEL.EHZ. 2021-04-16T02:55:34.45 1.0 undecidable manual P 128 87.6456 50 0.43 20
IV.MF5.EHZ. 2021-04-16T02:55:33.09 0.3 undecidable manual S 72 39.7269 50 0.84 57
IV.FRON.EHZ. 2021-04-16T02:55:32.09 0.1 undecidable manual P 343 74.0703 50 0.16 87
IV.MGAB.HHZ. 2021-04-16T02:55:32.04 0.3 undecidable manual P 273 71.6727 50 0.48 62
IV.ARRO.EHE. 2021-04-16T02:55:31.75 0.1 undecidable manual S 209 38.1285 50 -0.05 95
IV.FIAM.HHZ. 2021-04-16T02:55:31.39 0.3 undecidable manual P 171 68.5758 50 0.31 64
IV.ARVD.HHZ. 2021-04-16T02:55:31.07 0.1 undecidable manual P 357 68.7756 50 -0.05 90
IV.MTRA.EHZ. 2021-04-16T02:55:30.82 0.1 undecidable manual S 112 35.5422 50 -0.3 91
IV.SSFR.HHZ. 2021-04-16T02:55:30.46 0.1 undecidable manual P 345 64.0914 50 0.06 91
IV.OFFI.HHZ. 2021-04-16T02:55:30.07 0.3 undecidable manual P 83 56.5989 50 0.83 55
IV.ASSB.HHZ. 2021-04-16T02:55:30.15 0.1 undecidable manual S 304 32.6451 50 -0.19 94
IV.MNTT.EHZ. 2021-04-16T02:55:29.34 0.1 undecidable manual P 67 52.9026 50 0.66 79
IV.CSP1.EHE. 2021-04-16T02:55:29.00 0.6 undecidable manual S 36 29.1486 50 -0.42 45
IV.LNSS.HHZ. 2021-04-16T02:55:29.82 0.6 undecidable manual S 173 30.9468 50 -0.06 48
IV.MMO1.EHZ. 2021-04-16T02:55:28.56 0.1 undecidable manual S 85 27.2505 50 -0.34 92
IV.MML1.HNE. 2021-04-16T02:55:28.27 0.6 undecidable manual S 356 26.0517 50 -0.31 46
IT.FOPC.HGN. 2021-04-16T02:55:28.75 0.6 undecidable manual S 293 25.5522 50 0.28 47
IV.EL6.EHZ. 2021-04-16T02:55:28.21 0.1 positive manual P 10 50.7159 50 -0.12 92
IV.GAVE.EHZ. 2021-04-16T02:55:27.27 0.6 undecidable manual S 201 22.2555 115 -0.22 47
IV.ATCC.EHZ. 2021-04-16T02:55:27.39 0.1 undecidable manual P 320 44.4222 50 0.03 95
IV.CESX.HHZ. 2021-04-16T02:55:27.23 0.1 undecidable manual P 228 44.7219 50 -0.17 92
IV.RM33.EHZ. 2021-04-16T02:55:27.40 0.3 undecidable manual P 156 44.8218 50 -0.03 71
IV.SAP2.EHZ. 2021-04-16T02:55:27.02 0.1 undecidable manual P 54 40.8258 50 0.21 92
IV.SMA1.EHZ. 2021-04-16T02:55:26.83 0.1 undecidable manual P 135 39.2274 50 0.27 91
IV.MF5.EHZ. 2021-04-16T02:55:26.87 0.1 undecidable manual P 72 39.7269 50 0.22 92
IV.ARRO.EHE. 2021-04-16T02:55:26.34 0.1 undecidable manual P 209 38.1285 50 -0.05 96
IV.MOMA.HNZ. 2021-04-16T02:55:26.12 0.3 undecidable manual P 256 35.4423 50 0.15 71
IV.FDMO.HHZ. 2021-04-16T02:55:26.33 0.1 undecidable manual S 24 19.0698 118 -0.17 96
IV.LNSS.HHZ. 2021-04-16T02:55:25.10 0.1 positive manual P 173 30.9468 50 -0.18 94
IV.PF6.EHN. 2021-04-16T02:55:25.26 0.1 positive manual P 30 33.0447 50 -0.34 91
IV.T1299.HNN. 2021-04-16T02:55:25.80 0.1 undecidable manual P 139 35.9418 50 -0.26 92
IV.ASSB.HHZ. 2021-04-16T02:55:25.39 0.1 undecidable manual P 304 32.6451 50 -0.16 94
IV.CESI.HHZ. 2021-04-16T02:55:25.52 0.3 undecidable manual S 333 15.6732 123 0.03 75
IV.MTRA.EHZ. 2021-04-16T02:55:25.75 0.1 undecidable manual P 112 35.5422 50 -0.24 92
IV.MC2.EHZ. 2021-04-16T02:55:25.80 0.1 undecidable manual S 77 16.2726 122 0.12 98
IT.MTCL.HGZ. 2021-04-16T02:55:24.34 0.1 undecidable manual S 2 12.6762 129 -0.32 94
IV.MMO1.EHZ. 2021-04-16T02:55:24.48 0.1 positive manual P 85 27.2505 50 -0.23 94
IV.FEMA.HNZ. 2021-04-16T02:55:24.15 0.1 undecidable manual S 27 10.2786 135 0.12 99
IV.MML1.HNE. 2021-04-16T02:55:24.34 0.1 undecidable manual P 356 26.0517 50 -0.19 95
IT.FOPC.HGN. 2021-04-16T02:55:24.59 0.1 undecidable manual P 293 25.5522 50 0.13 96
IV.CSP1.EHE. 2021-04-16T02:55:24.83 0.1 positive manual P 36 29.1486 50 -0.18 94
IV.FDMO.HHZ. 2021-04-16T02:55:23.26 0.1 positive manual P 24 19.0698 118 -0.06 98
IV.GAVE.EHZ. 2021-04-16T02:55:23.97 0.1 undecidable manual P 201 22.2555 115 0.07 98
IV.NRCA.HNZ. 2021-04-16T02:55:23.96 0.1 undecidable manual S 117 11.0778 133 -0.27 96
IV.FEMA.HNZ. 2021-04-16T02:55:22.10 0.1 positive manual P 27 10.2786 135 0.2 97
IV.MC2.EHZ. 2021-04-16T02:55:22.90 0.1 positive manual P 77 16.2726 122 0.05 99
IV.NRCA.HNZ. 2021-04-16T02:55:22.07 0.1 positive manual P 117 11.0778 133 0.05 100
IT.MTCL.HGZ. 2021-04-16T02:55:22.32 0.1 undecidable manual P 2 12.6762 129 0.06 100
IV.CESI.HHZ. 2021-04-16T02:55:22.90 0.1 negative manual P 333 15.6732 123 0.16 97
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HNN. ML:2.2 0.0019199999999999998 0.14 AML other m 2021-04-16T02:55:24.18
IV.NRCA.HHN. ML:2.2 0.0020099999999999996 0.16 AML other m 2021-04-16T02:55:24.19
IV.FEMA.HNN. ML:2.2 0.001805 0.4 AML other m 2021-04-16T02:55:24.28
IV.FEMA.HNE. ML:2.6 0.004725 0.48 AML other m 2021-04-16T02:55:24.60
IV.NRCA.HHE. ML:2.0 0.00121 0.12 AML other m 2021-04-16T02:55:25.56
IV.NRCA.HNE. ML:2.0 0.0011400000000000002 0.12 AML other m 2021-04-16T02:55:25.56
IV.CESI.HHN. ML:1.8 0.0006734999999999999 0.38 AML other m 2021-04-16T02:55:25.99
IV.CESI.HHE. ML:1.7 0.000498 0.46 AML other m 2021-04-16T02:55:25.97
IV.GAVE.HNE. ML:2.3 0.00121 0.24 AML other m 2021-04-16T02:55:27.67
IV.GAVE.EHE. ML:2.3 0.001265 0.24 AML other m 2021-04-16T02:55:27.67
IV.GAVE.EHN. ML:2.0 0.0006575 0.2 AML other m 2021-04-16T02:55:27.85
IV.GAVE.HNN. ML:1.7 0.0003545 0.98 AML other m 2021-04-16T02:55:27.97
IV.LNSS.HHE. ML:1.8 0.0002695 0.2 AML other m 2021-04-16T02:55:30.32
IV.LNSS.HHN. ML:1.8 0.0003015 0.36 AML other m 2021-04-16T02:55:30.28
IV.ASSB.HHE. ML:1.7 0.00023 0.1 AML other m 2021-04-16T02:55:30.56
IV.ASSB.HHN. ML:1.6 0.00016849999999999998 0.62 AML other m 2021-04-16T02:55:30.52
IV.MTRA.EHE. ML:1.5 0.00011954999999999999 0.84 AML other m 2021-04-16T02:55:31.72
IV.MTRA.EHN. ML:1.7 0.0001835 0.34 AML other m 2021-04-16T02:55:31.87
IV.SMA1.EHE. ML:1.4 0.00007929999999999999 0.42 AML other m 2021-04-16T02:55:33.44
IV.ATCC.EHN. ML:1.4 0.00007014999999999998 0.22 AML other m 2021-04-16T02:55:34.14
IV.MF5.EHN. ML:1.5 0.000107715 1.32 AML other m 2021-04-16T02:55:34.21
IV.ATCC.EHE. ML:1.4 0.00008355 0.36 AML other m 2021-04-16T02:55:34.22
IV.MF5.EHE. ML:1.7 0.000164 0.54 AML other m 2021-04-16T02:55:34.67
IV.SAP2.EHE. ML:1.6 0.000152 0.48 AML other m 2021-04-16T02:55:34.45
IV.SAP2.EHN. ML:2.4 0.00078 0.7 AML other m 2021-04-16T02:55:34.54
IV.CESX.HHE. ML:1.4 0.000082 0.58 AML other m 2021-04-16T02:55:35.42
IV.RM33.EHE. ML:1.3 0.0000605 0.82 AML other m 2021-04-16T02:55:35.26
IV.CESX.HHN. ML:1.4 0.0000856 0.56 AML other m 2021-04-16T02:55:35.42
IV.RM33.EHN. ML:1.2 0.000049050000000000006 0.92 AML other m 2021-04-16T02:55:35.71
IV.EL6.EHE. ML:1.7 0.000131 0.42 AML other m 2021-04-16T02:55:35.93
IV.EL6.EHN. ML:1.9 0.0002235 0.26 AML other m 2021-04-16T02:55:36.57
IV.MNTT.EHN. ML:2.0 0.0002185 0.36 AML other m 2021-04-16T02:55:38.09
IV.MNTT.EHE. ML:2.2 0.00041549999999999996 0.32 AML other m 2021-04-16T02:55:39.49
IV.FIAM.HHN. ML:1.2 0.00002255 1.28 AML other m 2021-04-16T02:55:40.93
IV.SMA1.EHN. ML:1.2 0.000058700000000000004 0.32 AML other m 2021-04-16T02:55:41.00
IV.SSFR.HHN. ML:1.6 0.0000678 0.14 AML other m 2021-04-16T02:55:41.31
IV.ARVD.HHN. ML:1.2 0.000024800000000000003 0.58 AML other m 2021-04-16T02:55:41.65
IV.FIAM.HHE. ML:0.9 0.00001495 1.02 AML other m 2021-04-16T02:55:42.01
IV.ARVD.HHE. ML:1.2 0.0000266 0.92 AML other m 2021-04-16T02:55:42.04
IV.MGAB.HHE. ML:1.4 0.0000412 0.4 AML other m 2021-04-16T02:55:44.28
IV.MGAB.HHN. ML:1.3 0.000037449999999999995 0.4 AML other m 2021-04-16T02:55:44.34
IV.SSFR.HHE. ML:1.5 0.00006415 0.2 AML other m 2021-04-16T02:55:46.30
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