Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 18-05-2020 and time 09:46:43 (Italy) in region 6 km E Norcia (PG)

A magnitude ML 1.1 earthquake occured in region: 6 km E Norcia (PG), on

  • 18-05-2020 07:46:43 (UTC)
  • 18-05-2020 09:46:43 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7780, 13.1690 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 6 4957 4957
Arquata del Tronto AP 11 1178 6135
Accumoli RI 11 667 6802
Castelsantangelo sul Nera MC 13 281 7083
Cascia PG 14 3217 10300
Montegallo AP 15 523 10823
Preci PG 16 724 11547
Cittareale RI 18 482 12029
Visso MC 18 1107 13136
Ussita MC 19 444 13580
Montemonaco AP 19 604 14184
Amatrice RI 19 2657 16841
Acquasanta Terme AP 20 2916 19757

Municipalities with at least 50000 inhabitants

An earthquake occurred to
43 Km E of Foligno (57155 inhabitants)
46 Km W of Teramo (54892 inhabitants)
49 Km NE of Terni (111501 inhabitants)
51 Km NW of L'Aquila (69753 inhabitants)
73 Km SE of Perugia (166134 inhabitants)
85 Km W of Montesilvano (53738 inhabitants)
92 Km W of Pescara (121014 inhabitants)
94 Km NE of Guidonia Montecelio (88673 inhabitants)
95 Km NW of Chieti (51815 inhabitants)
95 Km NE of Tivoli (56533 inhabitants)
96 Km E of Viterbo (67173 inhabitants)
98 Km SW of Ancona (100861 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 2020-05-18
07:46:43		 42.7778 13.1688 10 2020-05-18
07:55:00		 Sala Sismica INGV-Roma 79274201
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-05-18 07:46:43 ± 0.06
Latitude 42.7778 ± 0.0036
Longitude 13.1688 ± 0.0049
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 79274201

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 480
Semi-minor axis of confidence ellipse (meter) 183
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 226
Circular confidence region, given by single value of horizontal uncertainty (meter) 480.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 180
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) 0.13
Epicentral distance of station closest to the epicenter (degree) 0.06835
Epicentral distance of station farthest from the epicenter (degree) 0.35523
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 0.1
Num. used stations 5
Type of magnitude ML
Reference to an origin 79274201
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-05-18 07:55:00
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.TERO.HHZ. 2020-05-18T07:46:56.71 0.6 undecidable manual S 116 39.4272 50 -0.17 47
IV.CESI.HHZ. 2020-05-18T07:46:55.12 0.6 undecidable manual S 320 33.1446 50 -0.08 48
IV.CSP1.EHZ. 2020-05-18T07:46:55.82 0.3 undecidable manual S 5 34.9428 50 0.12 72
IV.FDMO.HHZ. 2020-05-18T07:46:53.99 0.3 undecidable manual S 347 29.4483 50 -0.23 71
IV.TERO.HHZ. 2020-05-18T07:46:51.34 0.1 undecidable manual P 116 39.4272 50 0.01 97
IV.MMO1.EHZ. 2020-05-18T07:46:51.13 0.6 undecidable manual S 44 18.6702 119 0.01 50
IV.SMA1.EHZ. 2020-05-18T07:46:51.94 0.6 undecidable manual S 140 21.2676 116 0.02 50
IV.MTRA.EHZ. 2020-05-18T07:46:50.97 0.3 undecidable manual S 97 18.6702 119 -0.17 73
IV.CESI.HHZ. 2020-05-18T07:46:50.35 0.1 positive manual P 320 33.1446 50 0 98
IV.CSP1.EHZ. 2020-05-18T07:46:50.72 0.3 undecidable manual P 5 34.9428 50 0.08 72
IV.FDMO.HHZ. 2020-05-18T07:46:49.91 0.3 undecidable manual P 347 29.4483 50 0.12 72
IV.SMA1.EHZ. 2020-05-18T07:46:48.53 0.6 positive manual P 140 21.2676 116 0.07 49
IV.MTRA.EHZ. 2020-05-18T07:46:48.09 0.6 undecidable manual P 97 18.6702 119 0.08 50
IV.MMO1.EHZ. 2020-05-18T07:46:48.21 0.6 undecidable manual P 44 18.6702 119 0.22 48
IV.NRCA.HNZ. 2020-05-18T07:46:47.84 0.6 undecidable manual S 324 7.5813 144 -0.34 48
IV.NRCA.HNZ. 2020-05-18T07:46:46.43 0.1 negative manual P 324 7.5813 144 0.13 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MTRA.EHE. ML:1.2 0.00011615 0.4 AML other m 2020-05-18T07:46:51.24
IV.MTRA.EHN. ML:1.2 0.00012555 0.22 AML other m 2020-05-18T07:46:51.42
IV.SMA1.EHE. ML:1.0 0.00007445 1.48 AML other m 2020-05-18T07:46:55.00
IV.CESI.HHE. ML:1.2 0.000060450000000000006 0.22 AML other m 2020-05-18T07:46:55.31
IV.RM33.EHN. ML:0.9 0.000034099999999999995 0.82 AML other m 2020-05-18T07:46:55.53
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