Earthquake with magnitude of ML 1.1 on date 23-10-2020 and time 17:55:50 (Italy) in region 2 km NE Norcia (PG)

A magnitude ML 1.1 earthquake occured in region: 2 km NE Norcia (PG), on

  • 23-10-2020 15:55:50 (UTC)
  • 23-10-2020 17:55:50 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.81, 13.1 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 3 4957 4957
Preci PG 9 724 5681
Castelsantangelo sul Nera MC 10 281 5962
Cascia PG 13 3217 9179
Visso MC 13 1107 10286
Ussita MC 15 444 10730
Cerreto di Spoleto PG 15 1075 11805
Arquata del Tronto AP 16 1178 12983
Sellano PG 17 1079 14062
Accumoli RI 18 667 14729
Poggiodomo PG 18 117 14846
Montegallo AP 19 523 15369

Municipalities with at least 50000 inhabitants

An earthquake occurred to
36 Km E of Foligno (57155 inhabitants)
47 Km NE of Terni (111501 inhabitants)
52 Km W of Teramo (54892 inhabitants)
57 Km NW of L'Aquila (69753 inhabitants)
67 Km E of Perugia (166134 inhabitants)
92 Km W of Montesilvano (53738 inhabitants)
93 Km E of Viterbo (67173 inhabitants)
96 Km SW of Ancona (100861 inhabitants)
96 Km NE of Guidonia Montecelio (88673 inhabitants)
98 Km N of Tivoli (56533 inhabitants)
99 Km W of Pescara (121014 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 1.1 2020-10-23
15:55:50
42.81 13.1 11 2020-10-23
16:30:37
Sala Sismica INGV-Roma 84060831
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-10-23 15:55:50 ± 0.1
Latitude 42.81 ± 0.01
Longitude 13.10 ± 0.01
Depth (km) 11 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 84060831

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 680
Semi-minor axis of confidence ellipse (meter) 596
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 135
Circular confidence region, given by single value of horizontal uncertainty (meter) 680
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 127
Number of associated phases, regardless of their use for origin computation 12
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.24
Epicentral distance of station closest to the epicenter (degree) 0.02068
Epicentral distance of station farthest from the epicenter (degree) 0.28688
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.4
Num. used stations 6
Type of magnitude ML
Reference to an origin 84060831
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-10-23 16:30:37
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.CSP1.EHZ. 2020-10-23T15:56:02.02 0.3 undecidable manual S 15 0.2869 50 0.04 71
IV.CESI.HHZ. 2020-10-23T15:56:00.44 0.3 undecidable manual S 323 0.2401 50 -0.14 70
IV.GAVE.EHZ. 2020-10-23T15:55:59.12 0.3 undecidable manual S 232 0.197 50 -0.18 70
IV.MTRA.HNZ. 2020-10-23T15:55:59.89 0.3 undecidable manual S 105 0.2221 50 -0.16 70
IV.CSP1.EHZ. 2020-10-23T15:55:57.30 0.3 undecidable manual P 15 0.2869 50 -0.01 71
IV.CESI.HHZ. 2020-10-23T15:55:56.37 0.3 undecidable manual P 323 0.2401 50 -0.14 70
IV.MC2.EHZ. 2020-10-23T15:55:56.96 0.3 undecidable manual S 33 0.1151 130 0.24 70
IV.MTRA.HNZ. 2020-10-23T15:55:56.18 0.3 undecidable manual P 105 0.2221 50 -0.02 72
IV.GAVE.EHZ. 2020-10-23T15:55:56.39 0.3 undecidable manual P 232 0.197 50 0.63 62
IV.MC2.EHZ. 2020-10-23T15:55:54.38 0.1 undecidable manual P 33 0.1151 130 0.1 97
IV.NRCA.HHZ. 2020-10-23T15:55:54.36 0.3 undecidable manual S 21 0.0207 168 -0.37 70
IV.NRCA.HHZ. 2020-10-23T15:55:53.15 0.1 undecidable manual P 21 0.0207 168 0.02 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:1.4 0.0004292555 0.1024 AML other m 2020-10-23T15:55:54.53
IV.NRCA.HHN. ML:1.1 0.00021500025 0.128 AML other m 2020-10-23T15:55:54.57
IV.NRCA.HNE. ML:1.4 0.0004096521 0.0896 AML other m 2020-10-23T15:55:54.55
IV.NRCA.HNN. ML:1 0.00018388575 0.1408 AML other m 2020-10-23T15:55:54.57
IV.CESI.HHE. ML:0.3 1.19380145E-5 0.128 AML other m 2020-10-23T15:56:00.72
IV.CESI.HHN. ML:0.4 1.4743455E-5 0.1024 AML other m 2020-10-23T15:56:01.19
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