INGVCENTRO​NAZIONALE​TERREMOTI
Sala Sismica

Earthquake with magnitude of ML 1.1 on date 21-09-2018 and time 07:20:17 (Italy) in region 4 km NE Norcia (PG)

A magnitude ML 1.1 earthquake occured in region: 4 km NE Norcia (PG), on

  • 21-09-2018 05:20:17 (UTC)
  • 21-09-2018 07:20:17 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.83, 13.12 at 11 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 4 4957 4957
Castelsantangelo sul Nera MC 8 281 5238
Preci PG 9 724 5962
Visso MC 12 1107 7069
Ussita MC 13 444 7513
Cascia PG 15 3217 10730
Arquata del Tronto AP 16 1178 11908
Cerreto di Spoleto PG 16 1075 12983
Sellano PG 17 1079 14062
Montegallo AP 18 523 14585
Accumoli RI 18 667 15252
Montemonaco AP 19 604 15856
Poggiodomo PG 20 117 15973

Municipalities with at least 50000 inhabitants

An earthquake occurred to
37 Km E of Foligno (57155 inhabitants)
49 Km NE of Terni (111501 inhabitants)
52 Km W of Teramo (54892 inhabitants)
58 Km NW of L'Aquila (69753 inhabitants)
67 Km E of Perugia (166134 inhabitants)
91 Km W of Montesilvano (53738 inhabitants)
94 Km SW of Ancona (100861 inhabitants)
95 Km E of Viterbo (67173 inhabitants)
97 Km NE of Guidonia Montecelio (88673 inhabitants)
98 Km W of Pescara (121014 inhabitants)
100 Km N of Tivoli (56533 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 1.1 2018-09-21
05:20:17
42.83 13.12 11 2018-09-21
05:25:03
Sala Sismica INGV-Roma 61169561
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2018-09-21 05:20:17 ± 0.08
Latitude 42.83 ± 0.00
Longitude 13.12 ± 0.01
Depth (km) 11 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 61169561

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 594
Semi-minor axis of confidence ellipse (meter) 169
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 245
Circular confidence region, given by single value of horizontal uncertainty (meter) 590
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 125
Number of associated phases, regardless of their use for origin computation 26
Number of defining phases 21
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.22
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.2716
Number of stations at which the event was observed 16
Number of stations from which data was used for origin computation 11
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 16
Type of magnitude ML
Reference to an origin 61169561
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2018-09-21 05:25:03
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.EL6.EHZ. 2018-09-21T05:20:35.83 3.0 undecidable manual S -0.61 0
IV.ARVD.HHZ. 2018-09-21T05:20:30.42 3.0 negative manual P -1.2 0
IV.CSP1.EHZ. 2018-09-21T05:20:28.43 0.3 undecidable manual S 14 0.2716 91 -0.03 72
IV.CESI.HHZ. 2018-09-21T05:20:27.51 0.1 undecidable manual S 319 0.2356 91 0.1 93
IV.SMA1.EHZ. 2018-09-21T05:20:27.95 0.3 undecidable manual S 141 0.2545 91 -0.01 71
IV.T1299.HNZ. 2018-09-21T05:20:27.55 0.3 undecidable manual S 148 0.2284 91 0.36 68
IV.TERO.HHZ. 2018-09-21T05:20:26.32 3.0 positive manual P -0.32 0
IV.FDMO.HHZ. 2018-09-21T05:20:26.52 0.1 undecidable manual S 354 0.2095 92 -0.11 96
IV.MTRA.EHZ. 2018-09-21T05:20:26.76 0.3 undecidable manual S 109 0.2167 92 -0.09 70
IV.ASSB.HHZ. 2018-09-21T05:20:26.20 3.0 negative manual P -0.16 0
IV.RM33.EHZ. 2018-09-21T05:20:25.01 3.0 undecidable manual P 0.01 0
IV.MMO1.EHZ. 2018-09-21T05:20:25.03 0.3 undecidable manual S 65 0.1691 93 -0.41 66
IV.MC2.EHZ. 2018-09-21T05:20:24.14 0.3 undecidable manual S 32 0.098 117 0.74 61
IV.FEMA.HNZ. 2018-09-21T05:20:24.56 0.3 undecidable manual S 340 0.143 96 -0.1 73
IV.CSP1.EHZ. 2018-09-21T05:20:24.05 0.3 undecidable manual P 14 0.2716 91 0.02 72
IV.T1299.HNZ. 2018-09-21T05:20:23.44 0.3 undecidable manual P 148 0.2284 91 0.14 71
IV.CESI.HHZ. 2018-09-21T05:20:23.51 0.1 positive manual P 319 0.2356 91 0.09 94
IV.LNSS.HHZ. 2018-09-21T05:20:23.47 0.3 undecidable manual P 194 0.232 91 0.11 71
IV.SMA1.EHZ. 2018-09-21T05:20:23.73 0.3 undecidable manual P 141 0.2545 91 0 72
IV.MTRA.EHZ. 2018-09-21T05:20:22.95 0.3 undecidable manual P 109 0.2167 92 -0.15 70
IV.MMO1.EHZ. 2018-09-21T05:20:22.21 0.1 positive manual P 65 0.1691 93 -0.07 96
IV.FDMO.HHZ. 2018-09-21T05:20:22.96 0.1 undecidable manual P 354 0.2095 92 -0.01 97
IV.FEMA.HNZ. 2018-09-21T05:20:21.57 0.3 undecidable manual P 340 0.143 96 -0.26 71
IV.MC2.EHZ. 2018-09-21T05:20:21.27 0.1 negative manual P 32 0.098 117 0.16 96
IV.NRCA.HNZ. 2018-09-21T05:20:21.52 0.1 undecidable manual S 337 0.0063 176 -0.38 94
IV.NRCA.HNZ. 2018-09-21T05:20:20.27 0.1 negative manual P 337 0.0063 176 0.03 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:1.4 0.000439 0.06 AML other m 2018-09-21T05:20:21.64
IV.NRCA.HNE. ML:1.4 0.0004555 0.74 AML other m 2018-09-21T05:20:21.65
IV.NRCA.HNN. ML:1.4 0.000453 0.18 AML other m 2018-09-21T05:20:21.72
IV.NRCA.HHN. ML:1.4 0.000455 0.4 AML other m 2018-09-21T05:20:22.85
IV.FDMO.HHE. ML:1 5.935E-5 1.48 AML other m 2018-09-21T05:20:26.90
IV.FDMO.HHN. ML:1.1 8.21E-5 1.14 AML other m 2018-09-21T05:20:27.16
IV.MTRA.EHN. ML:0.9 4.785E-5 0.12 AML other m 2018-09-21T05:20:27.60
IV.MTRA.EHE. ML:1 6.475E-5 1.16 AML other m 2018-09-21T05:20:27.09
IV.CESI.HHN. ML:1.2 8.235E-5 0.24 AML other m 2018-09-21T05:20:27.89
IV.CESI.HHE. ML:1 5.2E-5 1.38 AML other m 2018-09-21T05:20:28.83
IV.SMA1.EHN. ML:0.9 3.845E-5 0.22 AML other m 2018-09-21T05:20:29.26
IV.SMA1.EHE. ML:0.9 4.1E-5 0.42 AML other m 2018-09-21T05:20:31.11
IV.TERO.HHE. ML:0.7 1.43E-5 0.84 AML other m 2018-09-21T05:20:32.47
IV.TERO.HHN. ML:0.7 1.59E-5 0.32 AML other m 2018-09-21T05:20:33.45
IV.ARVD.HHN. ML:1 1.51E-5 0.88 AML other m 2018-09-21T05:20:33.20
IV.ARVD.HHE. ML:1.2 2.295E-5 0.5 AML other m 2018-09-21T05:20:36.13
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