Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.7 on date 21-04-2020 and time 04:50:52 (Italy) in region 5 km SW Norcia (PG)

A magnitude ML 0.7 earthquake occured in region: 5 km SW Norcia (PG), on

  • 21-04-2020 02:50:52 (UTC)
  • 21-04-2020 04:50:52 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7660, 13.0420 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 5 4957 4957
Cascia PG 6 3217 8174
Poggiodomo PG 11 117 8291
Cerreto di Spoleto PG 12 1075 9366
Preci PG 13 724 10090
Vallo di Nera PG 15 364 10454
Monteleone di Spoleto PG 15 599 11053
Sellano PG 17 1079 12132
Sant'Anatolia di Narco PG 17 564 12696
Castelsantangelo sul Nera MC 17 281 12977
Scheggino PG 18 461 13438
Accumoli RI 19 667 14105
Visso MC 19 1107 15212
Cittareale RI 19 482 15694

Municipalities with at least 50000 inhabitants

An earthquake occurred to
35 Km SE of Foligno (57155 inhabitants)
39 Km NE of Terni (111501 inhabitants)
55 Km NW of L'Aquila (69753 inhabitants)
55 Km W of Teramo (54892 inhabitants)
65 Km SE of Perugia (166134 inhabitants)
86 Km E of Viterbo (67173 inhabitants)
89 Km N of Guidonia Montecelio (88673 inhabitants)
91 Km N of Tivoli (56533 inhabitants)
95 Km W of Montesilvano (53738 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 0.7 2020-04-21
02:50:52		 42.7655 13.0423 11 2020-04-21
03:04:24		 Sala Sismica INGV-Roma 78430441
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-04-21 02:50:52 ± 0.06
Latitude 42.7655 ± 0.0045
Longitude 13.0423 ± 0.0172
Depth (km) 11 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 78430441

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1399
Semi-minor axis of confidence ellipse (meter) 299
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 105
Circular confidence region, given by single value of horizontal uncertainty (meter) 1400.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 156
Number of associated phases, regardless of their use for origin computation 18
Number of defining phases 8
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.12
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.27249
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 4
Magnitude information

ML:0.7

Field Value
Value 0.7
Uncertainty 0.2
Num. used stations 4
Type of magnitude ML
Reference to an origin 78430441
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-04-21 03:04:24
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MILZ.HHZ. 2020-04-21T02:52:06.42 3.0 undecidable manual Sn -1.54 0
IV.RIBO.EHZ.01 2020-04-21T02:51:57.06 3.0 undecidable manual Sg 11.64 0
TV.SF01.EHZ. 2020-04-21T02:51:46.64 3.0 undecidable manual Sg 9.71 0
OT.OT13.EHZ. 2020-04-21T02:51:32.02 3.0 undecidable manual Sg 7.53 0
IV.EPZF.HHZ. 2020-04-21T02:51:30.36 3.0 undecidable manual Pn 1.15 0
IV.PAOL.HHZ. 2020-04-21T02:51:19.80 3.0 undecidable manual Sg 6.76 0
IV.ROSPO.HHZ. 2020-04-21T02:51:16.92 3.0 undecidable manual Sg 4.25 0
IV.FDMO.HHZ. 2020-04-21T02:51:03.20 0.3 undecidable manual S 7 30.2475 50 -0.05 98
IV.CESI.HHZ. 2020-04-21T02:51:02.76 0.3 undecidable manual S 337 28.8489 50 -0.1 97
IV.LNSS.HHZ. 2020-04-21T02:50:59.74 0.3 undecidable manual S 181 18.0708 120 -0.08 99
IV.FDMO.HHZ. 2020-04-21T02:50:58.75 0.3 undecidable manual P 7 30.2475 50 0.01 98
IV.CESI.HHZ. 2020-04-21T02:50:58.63 0.3 undecidable manual P 337 28.8489 50 0.12 96
IV.NRCA.HHZ. 2020-04-21T02:50:57.38 0.3 undecidable manual S 38 9.5793 138 -0.12 100
IV.LNSS.HHZ. 2020-04-21T02:50:56.79 0.3 undecidable manual P 181 18.0708 120 0.03 100
IV.NRCA.HHZ. 2020-04-21T02:50:55.61 0.3 undecidable manual P 38 9.5793 138 0.19 98
IV.PIGN.HHZ. 2020-04-21T02:50:53.38 3.0 positive manual Pn 1.41 0
IV.ROSPO.HHZ. 2020-04-21T02:50:53.75 3.0 negative manual P 0.58 0
IV.MIDA.HHZ. 2020-04-21T02:50:51.17 3.0 undecidable manual P 0.54 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:0.8 0.00008527211 0.0992 AML other m 2020-04-21T02:50:58.04
IV.NRCA.HHN. ML:0.8 0.00007994670500000001 0.1408 AML other m 2020-04-21T02:50:57.52
IV.LNSS.HHE. ML:0.6 0.0000367752 0.1408 AML other m 2020-04-21T02:50:59.84
IV.LNSS.HHN. ML:0.4 0.000022449835000000002 0.12 AML other m 2020-04-21T02:51:01.57
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