Earthquake with magnitude of ML 1.5 on date 20-08-2020 and time 14:33:21 (UTC) in region 4 km E Norcia (PG)

A magnitude ML 1.5 earthquake occured in region: 4 km E Norcia (PG), on

  • 20-08-2020 14:33:21 (UTC)
  • 20-08-2020 16:33:21 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.78, 13.14 at 8 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 12 281 5238
Cascia PG 13 3217 8455
Arquata del Tronto AP 13 1178 9633
Preci PG 13 724 10357
Accumoli RI 13 667 11024
Visso MC 17 1107 12131
Montegallo AP 17 523 12654
Ussita MC 18 444 13098
Poggiodomo PG 18 117 13215
Cittareale RI 19 482 13697
Cerreto di Spoleto PG 19 1075 14772

Municipalities with at least 50000 inhabitants

An earthquake occurred to
40 Km E of Foligno (57155 inhabitants)
47 Km NE of Terni (111501 inhabitants)
48 Km W of Teramo (54892 inhabitants)
53 Km NW of L'Aquila (69753 inhabitants)
71 Km SE of Perugia (166134 inhabitants)
88 Km W of Montesilvano (53738 inhabitants)
93 Km NE of Guidonia Montecelio (88673 inhabitants)
94 Km E of Viterbo (67173 inhabitants)
95 Km W of Pescara (121014 inhabitants)
95 Km N of Tivoli (56533 inhabitants)
97 Km NW of Chieti (51815 inhabitants)
98 Km SW of Ancona (100861 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
Reviewed
Rev100
ML 1.5 2020-08-20
14:33:21
42.78 13.14 8 2020-08-20
14:39:49
Sala Sismica INGV-Roma 82176251
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-08-20 14:33:21 ± 0.06
Latitude 42.78 ± 0.00
Longitude 13.14 ± 0.00
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 82176251

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 376
Semi-minor axis of confidence ellipse (meter) 82
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 248
Circular confidence region, given by single value of horizontal uncertainty (meter) 380
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 64
Number of associated phases, regardless of their use for origin computation 34
Number of defining phases 34
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) 0.05216
Epicentral distance of station farthest from the epicenter (degree) 0.65561
Number of stations at which the event was observed 19
Number of stations from which data was used for origin computation 19
Magnitude information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.1
Num. used stations 18
Type of magnitude ML
Reference to an origin 82176251
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-08-20 14:39:49
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.EL6.EHZ. 2020-08-20T14:33:41.28 0.6 undecidable manual S 357 0.545 50 0.52 41
IV.ASSB.HHZ. 2020-08-20T14:33:37.68 0.6 undecidable manual S 307 0.4362 50 0.17 46
IV.TERO.HHZ. 2020-08-20T14:33:35.19 0.3 undecidable manual S 115 0.3777 50 -0.61 62
IV.MURB.HHZ. 2020-08-20T14:33:34.75 0.6 positive manual P 317 0.6556 50 0.25 43
IV.MF5.EHZ. 2020-08-20T14:33:34.15 0.6 undecidable manual S 49 0.3112 103 0.37 45
IV.CSP1.EHZ. 2020-08-20T14:33:33.47 0.6 undecidable manual S 9 0.3112 103 -0.31 46
IV.RM33.EHZ. 2020-08-20T14:33:32.26 0.6 undecidable manual S 168 0.2806 105 -0.38 45
IV.CESI.HHZ. 2020-08-20T14:33:32.52 0.6 undecidable manual S 322 0.2788 105 -0.06 48
IV.EL6.EHZ. 2020-08-20T14:33:32.53 0.6 negative manual P 357 0.545 50 -0.08 46
IV.SMA1.EHZ. 2020-08-20T14:33:30.09 0.6 undecidable manual S 137 0.2113 109 0.02 49
IV.TERO.HHZ. 2020-08-20T14:33:30.04 0.6 undecidable manual P 115 0.3777 50 0.29 45
IV.ASSB.HHZ. 2020-08-20T14:33:30.55 0.3 negative manual P 307 0.4362 50 -0.18 69
IV.MTRA.EHZ. 2020-08-20T14:33:29.27 0.6 undecidable manual S 98 0.1916 111 -0.09 49
IV.GAVE.EHZ. 2020-08-20T14:33:29.87 0.6 undecidable manual S 243 0.2014 110 0.15 48
IV.LNSS.HHZ. 2020-08-20T14:33:29.44 0.6 undecidable manual S 202 0.1952 110 -0.05 49
IV.T1299.HNE. 2020-08-20T14:33:29.65 0.3 undecidable manual S 145 0.1835 112 0.58 65
IV.MF5.EHZ. 2020-08-20T14:33:28.57 1.0 undecidable manual P 49 0.3112 103 -0.01 24
IV.MMO1.EHE. 2020-08-20T14:33:28.74 0.6 undecidable manual S 50 0.1799 112 -0.2 48
IV.CSP1.EHZ. 2020-08-20T14:33:28.28 1.0 negative manual P 9 0.3112 103 -0.3 23
IV.MC2.EHZ. 2020-08-20T14:33:27.83 0.6 undecidable manual S 16 0.1322 119 0.54 45
IV.RM33.EHZ. 2020-08-20T14:33:27.59 0.6 negative manual P 168 0.2806 105 -0.33 46
IV.CESI.HHZ. 2020-08-20T14:33:27.87 1.0 undecidable manual P 322 0.2788 105 -0.02 24
IV.LNSS.HHZ. 2020-08-20T14:33:26.09 0.6 undecidable manual P 202 0.1952 110 -0.01 50
IV.FEMA.HNE. 2020-08-20T14:33:26.63 1.0 undecidable manual P 340 0.1889 111 0.65 21
IV.T1299.HNE. 2020-08-20T14:33:26.03 0.3 undecidable manual P 145 0.1835 112 0.17 72
IV.SMA1.EHZ. 2020-08-20T14:33:26.47 0.6 undecidable manual P 137 0.2113 109 0.03 49
IT.MTCL.HGE. 2020-08-20T14:33:26.80 0.6 undecidable manual P 334 0.2329 107 -0.1 48
IV.MTRA.EHZ. 2020-08-20T14:33:26.16 0.1 undecidable manual P 98 0.1916 111 0.13 97
IV.FDMO.HHN. 2020-08-20T14:33:26.91 0.6 undecidable manual P 352 0.2545 106 -0.46 45
IV.GAVE.EHZ. 2020-08-20T14:33:26.38 0.6 negative manual P 243 0.2014 110 0.15 48
IV.MMO1.EHE. 2020-08-20T14:33:25.52 0.3 undecidable manual P 50 0.1799 112 -0.27 71
IV.MC2.EHZ. 2020-08-20T14:33:25.10 0.3 negative manual P 16 0.1322 119 0.27 71
IV.NRCA.HNZ. 2020-08-20T14:33:24.43 0.6 undecidable manual S 340 0.0522 144 -0.49 46
IV.NRCA.HNZ. 2020-08-20T14:33:23.35 0.1 undecidable manual P 340 0.0522 144 -0.11 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:2.3 0.003855 1.9 AML other m 2020-08-20T14:33:25.03
IV.NRCA.HNE. ML:2.2 0.003375 1.9 AML other m 2020-08-20T14:33:25.03
IV.NRCA.HNN. ML:2.2 0.002815 0.1 AML other m 2020-08-20T14:33:25.34
IV.NRCA.HHN. ML:2.2 0.003065 0.12 AML other m 2020-08-20T14:33:25.34
IV.MTRA.EHN. ML:1.6 0.0003085 0.46 AML other m 2020-08-20T14:33:30.34
IV.GAVE.EHN. ML:1.6 0.000293 0.2 AML other m 2020-08-20T14:33:30.53
IV.LNSS.HHN. ML:1.6 0.0002975 0.2 AML other m 2020-08-20T14:33:31.40
IV.LNSS.HHE. ML:1.6 0.000309 0.56 AML other m 2020-08-20T14:33:31.35
IV.MTRA.EHE. ML:1.8 0.0004105 1.58 AML other m 2020-08-20T14:33:31.00
IV.GAVE.EHE. ML:1.7 0.0003405 0.2 AML other m 2020-08-20T14:33:32.27
IV.RM33.EHN. ML:1.5 0.000166 0.36 AML other m 2020-08-20T14:33:32.79
IV.SMA1.EHN. ML:1.5 0.000192 0.42 AML other m 2020-08-20T14:33:32.61
IV.SMA1.EHE. ML:1.6 0.0002285 0.44 AML other m 2020-08-20T14:33:33.26
IV.RM33.EHE. ML:1.6 0.0001885 0.18 AML other m 2020-08-20T14:33:33.61
IV.MF5.EHN. ML:1.4 0.0001022 1.5 AML other m 2020-08-20T14:33:35.16
IV.TERO.HHN. ML:1.3 5.89E-5 1.38 AML other m 2020-08-20T14:33:36.80
IV.ASSB.HHE. ML:1.5 8.385E-5 0.88 AML other m 2020-08-20T14:33:38.05
IV.MF5.EHE. ML:1.5 0.00012015 0.48 AML other m 2020-08-20T14:33:38.68
IV.TERO.HHE. ML:1.3 6.065E-5 0.4 AML other m 2020-08-20T14:33:38.75
IV.ASSB.HHN. ML:1.5 8.105E-5 1.4 AML other m 2020-08-20T14:33:39.85
IV.MURB.HHN. ML:1.6 6.945E-5 0.28 AML other m 2020-08-20T14:33:47.92
IV.MURB.HHE. ML:1.7 7.48E-5 0.42 AML other m 2020-08-20T14:33:49.75
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