Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.0 on date 21-07-2020 and time 16:33:51 (Italy) in region 4 km NE Norcia (PG)

A magnitude ML 1.0 earthquake occured in region: 4 km NE Norcia (PG), on

  • 21-07-2020 14:33:51 (UTC)
  • 21-07-2020 16:33:51 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8130, 13.1400 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.

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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 9 281 5238
Preci PG 11 724 5962
Arquata del Tronto AP 14 1178 7140
Visso MC 14 1107 8247
Cascia PG 15 3217 11464
Ussita MC 15 444 11908
Accumoli RI 16 667 12575
Montegallo AP 16 523 13098
Cerreto di Spoleto PG 18 1075 14173
Montemonaco AP 18 604 14777
Sellano PG 19 1079 15856

Municipalities with at least 50000 inhabitants

An earthquake occurred to
39 Km E of Foligno (57155 inhabitants)
49 Km NE of Terni (111501 inhabitants)
49 Km W of Teramo (54892 inhabitants)
56 Km NW of L'Aquila (69753 inhabitants)
69 Km E of Perugia (166134 inhabitants)
89 Km W of Montesilvano (53738 inhabitants)
95 Km SW of Ancona (100861 inhabitants)
95 Km E of Viterbo (67173 inhabitants)
96 Km W of Pescara (121014 inhabitants)
96 Km NE of Guidonia Montecelio (88673 inhabitants)
98 Km N of Tivoli (56533 inhabitants)
99 Km NW of Chieti (51815 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100 		ML 1.0 2020-07-21
14:33:51		 42.8132 13.1395 10 2020-07-21
15:07:55		 Sala Sismica INGV-Roma 81217741
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-07-21 14:33:51 ± 0.19
Latitude 42.8132 ± 0.0090
Longitude 13.1395 ± 0.0110
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 81217741

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1058
Semi-minor axis of confidence ellipse (meter) 705
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 213
Circular confidence region, given by single value of horizontal uncertainty (meter) 1060.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 211
Number of associated phases, regardless of their use for origin computation 13
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.25
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.32735
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 6
Magnitude information

ML:1.0

Field Value
Value 1.0
Uncertainty 0.4
Num. used stations 8
Type of magnitude ML
Reference to an origin 81217741
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-07-21 15:07:55
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.PIEI.HHZ. 2020-07-21T14:34:06.32 3.0 negative manual P -0.07 0
IV.PF6.EHN. 2020-07-21T14:34:03.10 0.3 undecidable manual S 7 36.3414 50 -0.31 69
IV.CSP1.EHZ. 2020-07-21T14:34:01.95 0.3 undecidable manual S 10 31.3464 50 -0.14 72
IV.MTRA.EHZ. 2020-07-21T14:33:59.33 0.3 undecidable manual S 107 21.867 115 -0.16 73
IV.PF6.EHN. 2020-07-21T14:33:58.22 0.3 undecidable manual P 7 36.3414 50 0.01 73
IV.MMO1.EHZ. 2020-07-21T14:33:58.19 0.3 undecidable manual S 58 17.9709 120 -0.12 74
IV.CSP1.EHZ. 2020-07-21T14:33:57.60 0.1 undecidable manual P 10 31.3464 50 0.16 95
IV.MC2.EHZ. 2020-07-21T14:33:56.60 0.3 undecidable manual S 20 11.5773 132 0.09 75
IV.MTRA.EHZ. 2020-07-21T14:33:55.93 0.3 undecidable manual P 107 21.867 115 -0.02 75
IV.MMO1.EHZ. 2020-07-21T14:33:55.42 0.1 undecidable manual P 58 17.9709 120 0.16 98
IV.NRCA.HHZ. 2020-07-21T14:33:54.30 0.3 undecidable manual S 318 3.0969 164 -0.55 68
IV.MC2.EHZ. 2020-07-21T14:33:54.59 0.1 undecidable manual P 20 11.5773 132 0.37 94
IV.NRCA.HHZ. 2020-07-21T14:33:53.43 0.1 undecidable manual P 318 3.0969 164 0.16 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:1.8 0.0011451655 0.1024 AML other m 2020-07-21T14:33:54.43
IV.NRCA.HHN. ML:1.5 0.0005137072499999999 0.0832 AML other m 2020-07-21T14:33:54.43
IV.MTRA.EHE. ML:1.0 0.000069097035 0.1408 AML other m 2020-07-21T14:34:01.02
IV.MTRA.EHN. ML:0.9 0.000052713205 0.1984 AML other m 2020-07-21T14:34:01.40
IV.MTRA.HNE. ML:1.0 0.00007418700500000001 0.1408 AML other m 2020-07-21T14:34:00.96
IV.MTRA.HNN. ML:0.9 0.00005457507 0.1792 AML other m 2020-07-21T14:34:01.22
IV.CSP1.EHE. ML:0.5 0.00001416575 0.1408 AML other m 2020-07-21T14:34:04.32
IV.CSP1.EHN. ML:0.5 0.000014524755 0.16 AML other m 2020-07-21T14:34:04.02
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