INGVCENTRO​NAZIONALE​TERREMOTI
Sala Sismica

Earthquake with magnitude of ML 1.6 on date 20-04-2017 and time 21:28:17 (Italy) in region 4 km E Norcia (PG)

A magnitude ML 1.6 earthquake occured in region: 4 km E Norcia (PG), on

  • 20-04-2017 19:28:17 (UTC)
  • 20-04-2017 21:28:17 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8, 13.15 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Norcia PG 5 4957 4957
Castelsantangelo sul Nera MC 11 281 5238
Preci PG 13 724 5962
Arquata del Tronto AP 13 1178 7140
Cascia PG 14 3217 10357
Accumoli RI 14 667 11024
Visso MC 15 1107 12131
Montegallo AP 16 523 12654
Ussita MC 16 444 13098
Montemonaco AP 19 604 13702
Cerreto di Spoleto PG 19 1075 14777
Poggiodomo PG 20 117 14894

Municipalities with at least 50000 inhabitants

An earthquake occurred to
40 Km E of Foligno (57155 inhabitants)
48 Km W of Teramo (54892 inhabitants)
49 Km NE of Terni (111501 inhabitants)
54 Km NW of L'Aquila (69753 inhabitants)
71 Km E of Perugia (166134 inhabitants)
88 Km W of Montesilvano (53738 inhabitants)
95 Km W of Pescara (121014 inhabitants)
95 Km E of Viterbo (67173 inhabitants)
95 Km NE of Guidonia Montecelio (88673 inhabitants)
96 Km SW of Ancona (100861 inhabitants)
97 Km NE of Tivoli (56533 inhabitants)
97 Km NW of Chieti (51815 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Rev 100 ML 1.6 2017-04-20
19:28:17
42.8 13.15 10 2017-04-20
19:34:31
Sala Sismica INGV-Roma 44147121
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2017-04-20 19:28:17 ± 0.04
Latitude 42.80 ± 0.00
Longitude 13.15 ± 0.00
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 44147121

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 306
Semi-minor axis of confidence ellipse (meter) 230
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 92
Circular confidence region, given by single value of horizontal uncertainty (meter) 310
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 79
Number of associated phases, regardless of their use for origin computation 43
Number of defining phases 28
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.16
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.29678
Number of stations at which the event was observed 28
Number of stations from which data was used for origin computation 14
Magnitude information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 17
Type of magnitude ML
Reference to an origin 44147121
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2017-04-20 19:34:31
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.PIEI.HHZ. 2017-04-20T19:28:47.50 3.0 undecidable manual S -0.05 0
IV.EL6.EHZ. 2017-04-20T19:28:36.56 3.0 undecidable manual S -0.02 0
IV.T1247.HHZ. 2017-04-20T19:28:31.20 3.0 undecidable manual S -0.22 0
IV.GUMA.HHZ. 2017-04-20T19:28:29.17 0.6 undecidable manual S 28 0.2968 50 0.55 43
IV.CING.HHZ. 2017-04-20T19:28:28.66 3.0 positive manual P -0.24 0
IV.CESI.HHZ. 2017-04-20T19:28:27.87 0.6 undecidable manual S 319 0.2716 50 -0.01 48
IV.EL6.EHZ. 2017-04-20T19:28:27.82 3.0 negative manual P -0.23 0
IV.T1219.EHZ. 2017-04-20T19:28:27.84 0.3 undecidable manual S 338 0.2761 50 -0.19 70
IV.SMA1.EHZ. 2017-04-20T19:28:26.07 0.6 undecidable manual S 141 0.2185 113 -0.21 47
IV.MOMA.HHZ. 2017-04-20T19:28:26.10 3.0 undecidable manual P -0.04 0
IV.SNTG.HHZ. 2017-04-20T19:28:26.96 3.0 negative manual P -0.16 0
IV.ASSB.HHZ. 2017-04-20T19:28:26.06 3.0 positive manual P -0.23 0
IV.FDMO.HHZ. 2017-04-20T19:28:26.75 0.6 undecidable manual S 349 0.241 50 -0.22 47
IV.GIGS.HHZ. 2017-04-20T19:28:26.43 3.0 positive manual P -0.42 0
IV.T1299.EHZ. 2017-04-20T19:28:25.52 0.3 undecidable manual S 149 0.1925 115 0.14 72
IV.T1217.EHZ. 2017-04-20T19:28:25.08 0.6 undecidable manual S 241 0.1817 117 0.09 49
IV.ARRO.EHZ. 2017-04-20T19:28:24.98 3.0 positive manual P 0.11 0
IV.TERO.HHZ. 2017-04-20T19:28:24.77 3.0 undecidable manual P -0.45 0
IV.MMO1.EHZ. 2017-04-20T19:28:24.27 0.6 undecidable manual S 53 0.1646 119 -0.16 48
IV.T1211.EHZ. 2017-04-20T19:28:24.46 3.0 positive manual P -0.14 0
IV.T1216.EHZ. 2017-04-20T19:28:23.31 0.6 undecidable manual S 314 0.1313 125 -0.01 50
IV.T1218.EHZ. 2017-04-20T19:28:23.44 0.6 undecidable manual S 190 0.1322 125 0.09 49
IV.CESI.HHZ. 2017-04-20T19:28:23.33 0.1 undecidable manual P 319 0.2716 50 -0.03 97
IV.GUMA.HHZ. 2017-04-20T19:28:23.97 0.1 positive manual P 28 0.2968 50 0.19 93
IV.T1219.EHZ. 2017-04-20T19:28:23.32 0.1 undecidable manual P 338 0.2761 50 -0.12 95
IV.MC2.EHZ. 2017-04-20T19:28:23.20 0.6 undecidable manual S 15 0.116 128 0.35 46
IV.RM33.EHZ. 2017-04-20T19:28:23.53 3.0 undecidable manual P -0.14 0
IV.FDMO.HHZ. 2017-04-20T19:28:22.63 0.1 undecidable manual P 349 0.241 50 -0.2 94
IV.T1299.EHZ. 2017-04-20T19:28:22.04 0.1 undecidable manual P 149 0.1925 115 0.12 96
IV.LNSS.HHZ. 2017-04-20T19:28:22.30 3.0 positive manual P 0.13 0
IV.SMA1.EHZ. 2017-04-20T19:28:22.19 0.1 undecidable manual P 141 0.2185 113 -0.24 93
IV.T1241.EHZ. 2017-04-20T19:28:22.22 3.0 positive manual P 0.02 0
IV.T1217.EHZ. 2017-04-20T19:28:21.72 0.1 undecidable manual P 241 0.1817 117 0.03 98
IV.T1214.EHZ. 2017-04-20T19:28:21.15 0.3 undecidable manual S 132 0.0603 147 -0.24 72
IV.T1245.HHZ. 2017-04-20T19:28:21.33 0.3 undecidable manual S 27 0.0639 145 -0.14 74
IV.MMO1.EHZ. 2017-04-20T19:28:21.25 0.1 positive manual P 53 0.1646 119 -0.11 97
IV.NRCA.HNZ. 2017-04-20T19:28:20.71 0.6 undecidable manual S 324 0.0414 155 -0.33 47
IV.MC2.EHZ. 2017-04-20T19:28:20.65 0.1 positive manual P 15 0.116 128 0.2 96
IV.T1216.EHZ. 2017-04-20T19:28:20.81 0.1 negative manual P 314 0.1313 125 0.09 98
IV.T1218.EHZ. 2017-04-20T19:28:20.82 0.1 positive manual P 190 0.1322 125 0.08 98
IV.NRCA.HNZ. 2017-04-20T19:28:19.48 0.1 undecidable manual P 324 0.0414 155 0.07 100
IV.T1214.EHZ. 2017-04-20T19:28:19.69 0.1 negative manual P 132 0.0603 147 0.08 99
IV.T1245.HHZ. 2017-04-20T19:28:19.78 0.1 positive manual P 27 0.0639 145 0.13 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CESI.HHN. ML:1.8 0.00034 0.22 AML other m 2017-04-20T19:28:28.35
IV.CESI.HHE. ML:1.6 0.0001735 0.38 AML other m 2017-04-20T19:28:28.35
IV.FDMO.HHN. ML:1.4 0.000136 0.8 AML other m 2017-04-20T19:28:27.00
IV.FDMO.HHE. ML:1.4 0.00013 0.46 AML other m 2017-04-20T19:28:28.56
IV.GUMA.HHE. ML:1.5 0.00012995 1.76 AML other m 2017-04-20T19:28:30.05
IV.GUMA.HHN. ML:1.6 0.000176 1.14 AML other m 2017-04-20T19:28:30.10
IV.LNSS.HHE. ML:1.7 0.000335 0.16 AML other m 2017-04-20T19:28:26.42
IV.LNSS.HHN. ML:1.6 0.000241 0.4 AML other m 2017-04-20T19:28:26.76
IV.MOMA.HHE. ML:1.3 5.335E-5 0.18 AML other m 2017-04-20T19:28:34.00
IV.MOMA.HHN. ML:1.2 4.135E-5 0.42 AML other m 2017-04-20T19:28:34.52
IV.NRCA.HHN. ML:1.9 0.001395 0.12 AML other m 2017-04-20T19:28:21.51
IV.NRCA.HNN. ML:1.9 0.001335 0.12 AML other m 2017-04-20T19:28:21.51
IV.NRCA.HHE. ML:1.9 0.001395 0.18 AML other m 2017-04-20T19:28:20.85
IV.NRCA.HNE. ML:1.9 0.00133 0.18 AML other m 2017-04-20T19:28:20.85
IV.RM33.EHN. ML:1.3 8.51E-5 1.6 AML other m 2017-04-20T19:28:29.88
IV.RM33.EHE. ML:1.4 0.0001215 0.78 AML other m 2017-04-20T19:28:29.01
IV.SMA1.EHE. ML:1.4 0.0001645 1.5 AML other m 2017-04-20T19:28:27.06
IV.SMA1.EHN. ML:1.4 0.000145 0.2 AML other m 2017-04-20T19:28:28.23
IV.T1214.HNE. ML:1.6 0.0006595 0.4 AML other m 2017-04-20T19:28:22.48
IV.T1214.EHE. ML:1.6 0.000651 0.4 AML other m 2017-04-20T19:28:22.48
IV.T1214.EHN. ML:1.6 0.000592 0.16 AML other m 2017-04-20T19:28:21.34
IV.T1214.HNN. ML:1.6 0.0006165 0.16 AML other m 2017-04-20T19:28:21.34
IV.T1216.EHE. ML:1.4 0.000246 0.44 AML other m 2017-04-20T19:28:23.94
IV.T1216.EHN. ML:1.5 0.00028 1.18 AML other m 2017-04-20T19:28:23.40
IV.T1217.EHE. ML:1.3 0.0001455 0.44 AML other m 2017-04-20T19:28:25.55
IV.T1217.EHN. ML:1.4 0.000182 0.16 AML other m 2017-04-20T19:28:26.02
IV.T1218.EHE. ML:1.5 0.000316 0.14 AML other m 2017-04-20T19:28:23.66
IV.T1218.EHN. ML:1.5 0.0003305 0.56 AML other m 2017-04-20T19:28:23.63
IV.T1218.HNN. ML:1.5 0.0003225 1.12 AML other m 2017-04-20T19:28:23.43
IV.T1218.HNE. ML:1.5 0.000335 0.14 AML other m 2017-04-20T19:28:23.73
IV.T1219.EHE. ML:1.9 0.0003865 0.34 AML other m 2017-04-20T19:28:28.06
IV.T1219.HNE. ML:1.9 0.000384 0.34 AML other m 2017-04-20T19:28:28.06
IV.T1219.HNN. ML:1.9 0.000358 0.36 AML other m 2017-04-20T19:28:28.16
IV.T1219.EHN. ML:1.9 0.000364 0.32 AML other m 2017-04-20T19:28:28.16
IV.T1241.EHE. ML:1.8 0.000343 1.54 AML other m 2017-04-20T19:28:26.95
IV.T1241.EHN. ML:2 0.0005595 0.1 AML other m 2017-04-20T19:28:25.89
IV.T1241.HNE. ML:1.7 0.0003285 0.72 AML other m 2017-04-20T19:28:26.95
IV.T1241.HNN. ML:2 0.0005875 0.1 AML other m 2017-04-20T19:28:25.94
IV.T1245.HNE. ML:1.9 0.00123 0.7 AML other m 2017-04-20T19:28:21.60
IV.T1245.HHN. ML:2.1 0.00185 1.42 AML other m 2017-04-20T19:28:22.86
IV.T1245.HNN. ML:2.1 0.001935 1.42 AML other m 2017-04-20T19:28:22.86
IV.T1245.HHE. ML:1.9 0.0012 0.68 AML other m 2017-04-20T19:28:22.60
IV.T1247.HHE. ML:1.6 0.00011905 0.56 AML other m 2017-04-20T19:28:32.09
IV.T1247.HHN. ML:1.7 0.00015 1.56 AML other m 2017-04-20T19:28:32.79
IV.T1299.EHN. ML:1.4 0.0001795 0.52 AML other m 2017-04-20T19:28:25.85
IV.T1299.EHE. ML:1.4 0.0001855 0.14 AML other m 2017-04-20T19:28:25.68
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download