Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 20-04-2020 and time 23:14:43 (UTC) in region 2 km NW Cascia (PG)

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

  • 20-04-2020 23:14:43 (UTC)
  • 21-04-2020 01:14:43 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7340, 13.0080 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
Cascia PG 2 3217 3217
Poggiodomo PG 6 117 3334
Norcia PG 10 4957 8291
Monteleone di Spoleto PG 10 599 8890
Cerreto di Spoleto PG 12 1075 9965
Vallo di Nera PG 13 364 10329
Sant'Anatolia di Narco PG 14 564 10893
Scheggino PG 15 461 11354
Preci PG 16 724 12078
Cittareale RI 18 482 12560
Sellano PG 19 1079 13639
Leonessa RI 19 2435 16074

Municipalities with at least 50000 inhabitants

An earthquake occurred to
35 Km SE of Foligno (57155 inhabitants)
35 Km NE of Terni (111501 inhabitants)
53 Km NW of L'Aquila (69753 inhabitants)
58 Km W of Teramo (54892 inhabitants)
65 Km SE of Perugia (166134 inhabitants)
82 Km E of Viterbo (67173 inhabitants)
85 Km N of Guidonia Montecelio (88673 inhabitants)
87 Km N of Tivoli (56533 inhabitants)
97 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 1.1 2020-04-20
23:14:43		 42.7338 13.0077 10 2020-04-20
23:19:21		 Sala Sismica INGV-Roma 78424441
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-04-20 23:14:43 ± 0.04
Latitude 42.7338 ± 0.0018
Longitude 13.0077 ± 0.0037
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 78424441

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 291
Semi-minor axis of confidence ellipse (meter) 161
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 108
Circular confidence region, given by single value of horizontal uncertainty (meter) 290.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 115
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.09
Epicentral distance of station closest to the epicenter (degree) 0.12680
Epicentral distance of station farthest from the epicenter (degree) 0.38581
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 6
Type of magnitude ML
Reference to an origin 78424441
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-04-20 23:19:21
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CSP1.EHZ. 2020-04-20T23:14:57.79 0.6 undecidable manual S 22 42.8238 50 0.02 48
IV.FDMO.HHZ. 2020-04-20T23:14:55.38 0.6 undecidable manual S 11 34.2435 50 -0.08 48
IV.CESI.HHZ. 2020-04-20T23:14:54.67 0.3 undecidable manual S 344 31.2465 50 0 73
IV.MMO1.EHZ. 2020-04-20T23:14:54.72 0.6 undecidable manual S 55 31.8459 50 -0.11 48
IV.SMA1.EHZ. 2020-04-20T23:14:54.13 0.6 undecidable manual S 113 29.0487 50 0.04 49
IV.ARRO.EHZ. 2020-04-20T23:14:53.10 0.6 undecidable manual S 229 26.1516 50 -0.22 47
IV.CSP1.EHZ. 2020-04-20T23:14:52.18 1.0 undecidable manual P 22 42.8238 50 0.35 22
IV.FDMO.HHZ. 2020-04-20T23:14:50.54 1.0 positive manual P 11 34.2435 50 0.04 24
IV.CESI.HHZ. 2020-04-20T23:14:50.10 0.3 negative manual P 344 31.2465 50 0.06 73
IV.MMO1.EHZ. 2020-04-20T23:14:50.13 0.6 undecidable manual P 55 31.8459 50 0 49
IV.ARRO.EHZ. 2020-04-20T23:14:49.43 1.0 positive manual P 229 26.1516 50 0.17 24
IV.NRCA.HHZ. 2020-04-20T23:14:49.57 0.6 undecidable manual S 38 14.0748 126 -0.22 48
IV.SMA1.EHZ. 2020-04-20T23:14:49.71 1.0 negative manual P 113 29.0487 50 0 25
IV.LNSS.HHZ. 2020-04-20T23:14:49.95 0.6 undecidable manual S 170 14.7741 125 -0.04 50
IV.NRCA.HHZ. 2020-04-20T23:14:47.30 0.1 positive manual P 38 14.0748 126 0.07 100
IV.LNSS.HHZ. 2020-04-20T23:14:47.39 0.1 positive manual P 170 14.7741 125 0.05 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:1.2 0.00016049999999999997 0.12 AML other m 2020-04-20T23:14:49.83
IV.NRCA.HHE. ML:1.6 0.00035499999999999996 0.16 AML other m 2020-04-20T23:14:49.84
IV.LNSS.HHE. ML:1.1 0.00011945 0.54 AML other m 2020-04-20T23:14:50.29
IV.LNSS.HHN. ML:1.0 0.0001003 0.48 AML other m 2020-04-20T23:14:50.34
IV.FDMO.HHN. ML:0.8 0.000025349999999999996 1.68 AML other m 2020-04-20T23:14:56.86
IV.FDMO.HHE. ML:1.1 0.000049000000000000005 1.16 AML other m 2020-04-20T23:14:56.04
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