Earthquake with magnitude of ML 0.9 on date 21-09-2020 and time 22:20:52 (UTC) in region 5 km N Norcia (PG)

A magnitude ML 0.9 earthquake occured in region: 5 km N Norcia (PG), on

  • 21-09-2020 22:20:52 (UTC)
  • 22-09-2020 00:20:52 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.84, 13.11 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 5 4957 4957
Preci PG 7 724 5681
Castelsantangelo sul Nera MC 7 281 5962
Visso MC 10 1107 7069
Ussita MC 12 444 7513
Cascia PG 15 3217 10730
Sellano PG 16 1079 11809
Cerreto di Spoleto PG 16 1075 12884
Arquata del Tronto AP 17 1178 14062
Montegallo AP 19 523 14585
Montemonaco AP 19 604 15189
Monte Cavallo MC 19 145 15334
Accumoli RI 20 667 16001
Poggiodomo PG 20 117 16118
Bolognola MC 20 142 16260

Municipalities with at least 50000 inhabitants

An earthquake occurred to
35 Km E of Foligno (57155 inhabitants)
49 Km NE of Terni (111501 inhabitants)
53 Km W of Teramo (54892 inhabitants)
59 Km NW of L'Aquila (69753 inhabitants)
66 Km E of Perugia (166134 inhabitants)
93 Km W of Montesilvano (53738 inhabitants)
93 Km SW of Ancona (100861 inhabitants)
94 Km NE of Viterbo (67173 inhabitants)
98 Km NE of Guidonia Montecelio (88673 inhabitants)
100 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
Reviewed
Rev100
ML 0.9 2020-09-21
22:20:52
42.84 13.11 10 2020-09-21
22:36:20
Sala Sismica INGV-Roma 83117741
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-09-21 22:20:52 ± 0.04
Latitude 42.84 ± 0.00
Longitude 13.11 ± 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 83117741

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 307
Semi-minor axis of confidence ellipse (meter) 179
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 70
Circular confidence region, given by single value of horizontal uncertainty (meter) 310
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 91
Number of associated phases, regardless of their use for origin computation 26
Number of defining phases 26
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.17
Epicentral distance of station closest to the epicenter (degree) 0.00809
Epicentral distance of station farthest from the epicenter (degree) 0.49013
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 13
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.3
Num. used stations 15
Type of magnitude ML
Reference to an origin 83117741
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-09-21 22:36:20
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.EL6.EHZ. 2020-09-21T22:21:09.94 0.6 undecidable manual S 360 0.4901 50 0.57 41
IV.SMA1.EHZ. 2020-09-21T22:21:02.86 0.3 undecidable manual S 141 0.2671 50 0.09 72
IV.T1299.HNZ. 2020-09-21T22:21:02.15 0.3 undecidable manual S 148 0.2419 110 0.15 72
IV.EL6.EHZ. 2020-09-21T22:21:02.00 0.3 undecidable manual P 360 0.4901 50 -0.07 70
IV.CSP1.EHZ. 2020-09-21T22:21:02.43 0.3 undecidable manual S 16 0.2626 50 -0.2 71
IV.MTRA.EHZ. 2020-09-21T22:21:01.19 0.3 undecidable manual S 111 0.2275 111 -0.32 69
IV.CESI.HHZ. 2020-09-21T22:21:01.10 0.3 undecidable manual S 318 0.2221 112 -0.2 71
IV.LNSS.HHZ. 2020-09-21T22:21:01.90 0.3 undecidable manual S 192 0.241 110 -0.06 73
IV.GAVE.EHZ. 2020-09-21T22:21:00.92 0.3 undecidable manual S 227 0.214 112 -0.08 73
IV.FDMO.HHZ. 2020-09-21T22:21:00.26 0.3 undecidable manual S 356 0.1979 114 -0.19 72
IV.MMO1.EHZ. 2020-09-21T22:20:59.28 0.3 undecidable manual S 69 0.1727 117 -0.27 71
IT.MTCL.HGZ. 2020-09-21T22:20:59.60 0.3 undecidable manual S 333 0.1736 117 0.01 75
IV.SMA1.EHZ. 2020-09-21T22:20:58.29 0.3 undecidable manual P 141 0.2671 50 0.03 73
IV.CESI.HHZ. 2020-09-21T22:20:57.42 0.3 undecidable manual P 318 0.2221 112 0.01 74
IV.LNSS.HHZ. 2020-09-21T22:20:57.73 0.3 undecidable manual P 192 0.241 110 -0.07 73
IV.CSP1.EHZ. 2020-09-21T22:20:57.97 0.3 undecidable manual P 16 0.2626 50 -0.21 71
IV.MC2.EHZ. 2020-09-21T22:20:57.49 0.3 undecidable manual S 40 0.0944 133 0.43 70
IV.GAVE.EHZ. 2020-09-21T22:20:57.34 0.3 undecidable manual P 227 0.214 112 0.11 73
IV.T1299.HNZ. 2020-09-21T22:20:57.86 0.3 undecidable manual P 148 0.2419 110 0.05 73
IV.MTRA.EHZ. 2020-09-21T22:20:57.45 0.3 undecidable manual P 111 0.2275 111 -0.07 73
IV.MMO1.EHZ. 2020-09-21T22:20:56.41 0.1 undecidable manual P 69 0.1727 117 0.01 100
IV.FDMO.HHZ. 2020-09-21T22:20:56.88 0.1 undecidable manual P 356 0.1979 114 -0.03 99
IT.MTCL.HGZ. 2020-09-21T22:20:56.45 0.3 undecidable manual P 333 0.1736 117 0.03 75
IV.NRCA.HHZ. 2020-09-21T22:20:55.43 0.3 undecidable manual S 132 0.0081 175 -0.06 76
IV.MC2.EHZ. 2020-09-21T22:20:55.39 0.3 undecidable manual P 40 0.0944 133 0.43 70
IV.NRCA.HHZ. 2020-09-21T22:20:54.21 0.3 undecidable manual P 132 0.0081 175 0.15 75
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:0 0.0008175 0.14 AML other m 2020-09-21T22:20:55.60
IV.NRCA.HHN. ML:0 0.000267 0.16 AML other m 2020-09-21T22:20:55.81
IV.CESI.HHN. ML:1.1 7.235E-5 0.24 AML other m 2020-09-21T22:21:01.47
IV.CESI.HHE. ML:0.9 4.55E-5 0.46 AML other m 2020-09-21T22:21:01.60
IV.MTRA.EHN. ML:0.9 5.11E-5 0.16 AML other m 2020-09-21T22:21:01.87
IV.NRCA.HNE. ML:0 0.0007741768 0.0768 AML other m 2020-09-21T22:20:55.60
IV.NRCA.HNN. ML:0 0.0002398185 0.1664 AML other m 2020-09-21T22:20:55.81
IV.FDMO.HHE. ML:0.4 1.413034E-5 0.8192 AML other m 2020-09-21T22:21:00.76
IV.FDMO.HHN. ML:0.4 1.5436555E-5 0.3584 AML other m 2020-09-21T22:21:01.11
IV.GAVE.EHE. ML:1 5.828652E-5 0.2048 AML other m 2020-09-21T22:21:01.50
IV.GAVE.EHN. ML:0.8 4.109174E-5 1.152 AML other m 2020-09-21T22:21:01.45
IV.GAVE.HNE. ML:1.2 9.8744975E-5 0.448 AML other m 2020-09-21T22:21:01.18
IV.MTRA.EHE. ML:0.8 3.6682265E-5 0.1664 AML other m 2020-09-21T22:21:01.74
IV.MTRA.HNE. ML:1.1 8.160315E-5 0.9472 AML other m 2020-09-21T22:21:02.02
IV.MTRA.HNN. ML:1.2 0.00010002742 0.6656 AML other m 2020-09-21T22:21:02.02
IV.CSP1.EHE. ML:0.8 3.2773779E-5 0.0896 AML other m 2020-09-21T22:21:02.88
IV.CSP1.EHN. ML:1 4.5136925E-5 0.1408 AML other m 2020-09-21T22:21:03.82
IV.SMA1.EHE. ML:0.6 2.174771E-5 0.3072 AML other m 2020-09-21T22:21:05.18
IV.SMA1.EHN. ML:0.6 2.0871755E-5 0.2432 AML other m 2020-09-21T22:21:03.58
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