Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.5 on date 22-10-2020 and time 00:31:03 (UTC) in region 6 km E Norcia (PG)

A magnitude ML 0.5 earthquake occured in region: 6 km E Norcia (PG), on

  • 22-10-2020 00:31:03 (UTC)
  • 22-10-2020 02:31:03 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.802, 13.162 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.

Hai sentito il terremoto? Clicca qui

Did you feel it? Fill in the questionnaire.

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 6 4957 4957
Castelsantangelo sul Nera MC 10 281 5238
Arquata del Tronto AP 12 1178 6416
Preci PG 13 724 7140
Accumoli RI 14 667 7807
Montegallo AP 15 523 8330
Cascia PG 15 3217 11547
Visso MC 16 1107 12654
Ussita MC 16 444 13098
Montemonaco AP 17 604 13702

Municipalities with at least 50000 inhabitants

An earthquake occurred to
41 Km E of Foligno (57155 inhabitants)
47 Km W of Teramo (54892 inhabitants)
50 Km NE of Terni (111501 inhabitants)
54 Km NW of L'Aquila (69753 inhabitants)
71 Km E of Perugia (166134 inhabitants)
87 Km W of Montesilvano (53738 inhabitants)
94 Km W of Pescara (121014 inhabitants)
95 Km SW of Ancona (100861 inhabitants)
96 Km NE of Guidonia Montecelio (88673 inhabitants)
96 Km E of Viterbo (67173 inhabitants)
97 Km NW of Chieti (51815 inhabitants)
98 Km NE of Tivoli (56533 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web 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 0.5 2020-10-22
00:31:03		 42.8025 13.1617 8 2020-10-22
00:40:08		 Sala Sismica INGV-Roma 84009211
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-10-22 00:31:03 ± 0.08
Latitude 42.8025 ± 0.0027
Longitude 13.1617 ± 0.0049
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 84009211

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 380
Semi-minor axis of confidence ellipse (meter) 146
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 78
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) 71
Number of associated phases, regardless of their use for origin computation 22
Number of defining phases 22
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.21
Epicentral distance of station closest to the epicenter (degree) 0.04676
Epicentral distance of station farthest from the epicenter (degree) 0.28598
Number of stations at which the event was observed 11
Number of stations from which data was used for origin computation 11
Magnitude information

ML:0.5

Field Value
Value 0.5
Uncertainty 0.1
Num. used stations 8
Type of magnitude ML
Reference to an origin 84009211
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-10-22 00:40:08
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.MF5.EHZ. 2020-10-22T00:31:15.87 0.6 undecidable manual S 50 0.286 105 0.52 58
IV.CESI.HHZ. 2020-10-22T00:31:14.71 0.6 undecidable manual S 317 0.2761 105 -0.26 63
IV.GAVE.EHZ. 2020-10-22T00:31:13.17 0.6 undecidable manual S 241 0.2248 109 0.08 66
IV.SMA1.EHZ. 2020-10-22T00:31:12.62 0.6 undecidable manual S 143 0.214 109 -0.07 66
IV.LNSS.HHZ. 2020-10-22T00:31:12.73 0.6 undecidable manual S 204 0.2185 109 -0.12 65
IV.FDMO.HHZ. 2020-10-22T00:31:12.82 0.6 undecidable manual S 347 0.2401 108 -0.82 53
IV.MTRA.HNZ. 2020-10-22T00:31:11.06 0.6 undecidable manual S 105 0.1781 113 -0.34 62
IV.T1299.HNZ. 2020-10-22T00:31:11.88 0.6 undecidable manual S 152 0.1898 112 0.06 67
IV.MMO1.EHZ. 2020-10-22T00:31:10.45 0.6 undecidable manual S 51 0.1547 116 -0.14 65
IV.MF5.EHZ. 2020-10-22T00:31:10.53 0.3 undecidable manual P 50 0.286 105 0 98
IV.CESI.HHZ. 2020-10-22T00:31:10.22 0.3 undecidable manual P 317 0.2761 105 -0.09 98
IV.FDMO.HHZ. 2020-10-22T00:31:09.45 0.3 undecidable manual P 347 0.2401 108 -0.09 98
IV.MC2.EHZ. 2020-10-22T00:31:09.73 0.6 undecidable manual S 10 0.1106 124 0.62 60
IV.GAVE.EHZ. 2020-10-22T00:31:09.35 0.3 undecidable manual P 241 0.2248 109 0.13 97
IV.LNSS.HHZ. 2020-10-22T00:31:09.00 0.3 undecidable manual P 204 0.2185 109 -0.08 99
IV.MTRA.HNZ. 2020-10-22T00:31:08.19 0.3 undecidable manual P 105 0.1781 113 -0.06 100
IV.SMA1.EHZ. 2020-10-22T00:31:08.96 0.3 undecidable manual P 143 0.214 109 -0.03 100
IV.T1299.HNZ. 2020-10-22T00:31:08.58 0.3 undecidable manual P 152 0.1898 112 0.09 99
IV.MC2.EHZ. 2020-10-22T00:31:07.25 0.3 undecidable manual P 10 0.1106 124 0.32 96
IV.MMO1.EHZ. 2020-10-22T00:31:07.68 0.3 undecidable manual P 51 0.1547 116 -0.1 99
IV.NRCA.HHZ. 2020-10-22T00:31:07.42 0.6 undecidable manual S 312 0.0468 148 0.05 68
IV.NRCA.HHZ. 2020-10-22T00:31:06.18 0.3 undecidable manual P 312 0.0468 148 0.26 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:0 0.0002548113 0.06 AML other m 2020-10-22T00:31:07.75
IV.NRCA.HHN. ML:0 0.0002626741 0.06 AML other m 2020-10-22T00:31:07.48
IV.NRCA.HNE. ML:0 0.0002513316 0.06 AML other m 2020-10-22T00:31:07.74
IV.NRCA.HNN. ML:0 0.0002286417 0.06 AML other m 2020-10-22T00:31:07.48
IV.SMA1.EHE. ML:0.6 2.2691675E-5 0.4 AML other m 2020-10-22T00:31:15.98
IV.SMA1.EHN. ML:0.4 1.36271255E-5 0.22 AML other m 2020-10-22T00:31:15.94
IV.GAVE.EHE. ML:0.6 2.741738E-5 0.44 AML other m 2020-10-22T00:31:15.37
IV.GAVE.EHN. ML:0.5 2.0705085E-5 0.16 AML other m 2020-10-22T00:31:15.49
IV.FDMO.HHE. ML:0.4 1.5996225E-5 0.2 AML other m 2020-10-22T00:31:13.81
IV.FDMO.HHN. ML:0.6 2.114654E-5 0.16 AML other m 2020-10-22T00:31:14.66
IV.CESI.HHE. ML:0.3 8.863918E-6 0.18 AML other m 2020-10-22T00:31:14.96
IV.CESI.HHN. ML:0.5 1.479693E-5 0.18 AML other m 2020-10-22T00:31:16.02
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