INGVCENTRO​NAZIONALE​TERREMOTI
Sala Sismica

Earthquake with magnitude of ML 1.5 on date 21-04-2017 and time 07:37:09 (Italy) in region 3 km NE Norcia (PG)

A magnitude ML 1.5 earthquake occured in region: 3 km NE Norcia (PG), on

  • 21-04-2017 05:37:09 (UTC)
  • 21-04-2017 07:37:09 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.81, 13.13 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 3 4957 4957
Castelsantangelo sul Nera MC 10 281 5238
Preci PG 11 724 5962
Cascia PG 14 3217 9179
Visso MC 14 1107 10286
Arquata del Tronto AP 15 1178 11464
Ussita MC 15 444 11908
Accumoli RI 16 667 12575
Cerreto di Spoleto PG 17 1075 13650
Montegallo AP 17 523 14173
Sellano PG 19 1079 15252
Poggiodomo PG 19 117 15369
Montemonaco AP 19 604 15973

Municipalities with at least 50000 inhabitants

An earthquake occurred to
38 Km E of Foligno (57155 inhabitants)
48 Km NE of Terni (111501 inhabitants)
50 Km W of Teramo (54892 inhabitants)
56 Km NW of L'Aquila (69753 inhabitants)
69 Km E of Perugia (166134 inhabitants)
90 Km W of Montesilvano (53738 inhabitants)
94 Km E of Viterbo (67173 inhabitants)
95 Km SW of Ancona (100861 inhabitants)
96 Km NE of Guidonia Montecelio (88673 inhabitants)
97 Km W of Pescara (121014 inhabitants)
98 Km N of Tivoli (56533 inhabitants)
99 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 Date and Time (UTC) Latitude Longitude Magnitude Depth (km) Published time (UTC) Author Location ID
Rev 100 2017-04-21
05:37:09
42.81 13.13 ML 1.5 10 2017-04-21
05:56:05
Sala Sismica INGV-Roma 44164471
Best location and best magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2017-04-21 05:37:09 ± 0.07
Latitude 42.81 ± 0.00
Longitude 13.13 ± 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 44164471

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 418
Semi-minor axis of confidence ellipse (meter) 96
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 99
Circular confidence region, given by single value of horizontal uncertainty (meter) 420
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 80
Number of associated phases, regardless of their use for origin computation 28
Number of defining phases 27
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.26
Epicentral distance of station closest to the epicenter (degree) 0.02608
Epicentral distance of station farthest from the epicenter (degree) 0.52071
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 14
Magnitude information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.1
Num. used stations 3
Type of magnitude ML
Reference to an origin 44164471
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2017-04-21 05:56:05
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.EL6.EHZ. 2017-04-21T05:37:19.68 3.0 undecidable manual P 358 0.5207 50 0.01 0
IV.T1211.EHZ. 2017-04-21T05:37:16.58 1.0 negative manual P 216 0.3408 50 -0.01 24
IV.RM33.EHZ. 2017-04-21T05:37:16.11 0.1 undecidable manual P 168 0.3067 50 0.1 94
IV.T1219.EHZ. 2017-04-21T05:37:15.00 1.0 positive manual P 340 0.2626 50 -0.25 23
IV.T1241.EHZ. 2017-04-21T05:37:14.32 0.1 undecidable manual P 78 0.2275 111 -0.24 92
IV.FDMO.HHZ. 2017-04-21T05:37:14.37 0.1 undecidable manual P 353 0.2293 111 -0.22 93
IV.T1299.EHZ. 2017-04-21T05:37:14.26 1.0 positive manual P 147 0.2086 112 0.1 24
IV.T1217.EHZ. 2017-04-21T05:37:13.44 0.3 positive manual P 236 0.1736 116 -0.01 73
IV.MC2.EHZ. 2017-04-21T05:37:12.49 0.1 positive manual P 24 0.1115 128 0.2 95
IV.T1218.EHZ. 2017-04-21T05:37:12.92 0.6 negative manual P 184 0.1394 122 0.13 48
IV.T1216.EHZ. 2017-04-21T05:37:12.40 0.6 positive manual P 316 0.1142 127 0.08 49
IV.T1245.HHZ. 2017-04-21T05:37:11.69 0.1 positive manual P 43 0.0648 143 0.14 97
IV.T1212.EHZ. 2017-04-21T05:37:12.00 0.1 positive manual P 227 0.0836 136 0.19 96
IV.NRCA.HNZ. 2017-04-21T05:37:11.19 0.1 undecidable manual P 339 0.0261 163 0.04 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:1.8 0.0011725 0.14 AML other m 2017-04-21T05:37:12.40
IV.NRCA.HNN. ML:1.7 0.001033 0.16 AML other m 2017-04-21T05:37:12.41
IV.NRCA.HHE. ML:1.6 0.000746 0.16 AML other m 2017-04-21T05:37:12.40
IV.NRCA.HNE. ML:1.6 0.000699 0.14 AML other m 2017-04-21T05:37:12.41
IV.T1212.EHE. ML:1.5 0.000388 0.18 AML other m 2017-04-21T05:37:13.93
IV.T1212.HNE. ML:1.5 0.0003975 0.18 AML other m 2017-04-21T05:37:13.93
IV.T1212.EHN. ML:1.4 0.000332 1.68 AML other m 2017-04-21T05:37:13.87
IV.T1212.HNN. ML:1.4 0.000345 1.68 AML other m 2017-04-21T05:37:13.87
IV.T1245.HHE. ML:1.5 0.0004425 0.52 AML other m 2017-04-21T05:37:13.91
IV.T1245.HNE. ML:1.6 0.000613 0.76 AML other m 2017-04-21T05:37:13.27
IV.T1245.HHN. ML:1.5 0.0004965 0.12 AML other m 2017-04-21T05:37:13.65
IV.T1245.HNN. ML:1.6 0.000552 0.26 AML other m 2017-04-21T05:37:14.79
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