Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 11-04-2021 and time 23:27:02 (UTC) in region 3 km W Preci (PG)

A magnitude ML 1.1 earthquake occured in region: 3 km W Preci (PG), on

  • 11-04-2021 23:27:02 (UTC)
  • 12-04-2021 01:27:02 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8750, 13.0020 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
Preci PG 3 724 724
Sellano PG 6 1079 1803
Cerreto di Spoleto PG 9 1075 2878
Visso MC 10 1107 3985
Norcia PG 12 4957 8942
Castelsantangelo sul Nera MC 13 281 9223
Monte Cavallo MC 13 145 9368
Ussita MC 14 444 9812
Vallo di Nera PG 16 364 10176
Cascia PG 17 3217 13393
Poggiodomo PG 19 117 13510
Campello sul Clitunno PG 19 2442 15952
Pieve Torina MC 19 1458 17410
Fiordimonte MC 20 202 17612

Municipalities with at least 50000 inhabitants

An earthquake occurred to
26 Km E of Foligno (57155 inhabitants)
45 Km NE of Terni (111501 inhabitants)
56 Km E of Perugia (166134 inhabitants)
62 Km W of Teramo (54892 inhabitants)
67 Km NW of L'Aquila (69753 inhabitants)
89 Km NE of Viterbo (67173 inhabitants)
93 Km SW of Ancona (100861 inhabitants)
100 Km N of Guidonia Montecelio (88673 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 2021-04-11
23:27:02		 42.8747 13.0022 11 2021-04-11
23:44:48		 Sala Sismica INGV-Roma 89023571
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-11 23:27:02 ± 0.07
Latitude 42.8747 ± 0.0027
Longitude 13.0022 ± 0.0049
Depth (km) 11 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 89023571

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 314
Semi-minor axis of confidence ellipse (meter) 230
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 269
Circular confidence region, given by single value of horizontal uncertainty (meter) 310.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 127
Number of associated phases, regardless of their use for origin computation 10
Number of defining phases 10
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.15
Epicentral distance of station closest to the epicenter (degree) 0.09173
Epicentral distance of station farthest from the epicenter (degree) 0.23922
Number of stations at which the event was observed 5
Number of stations from which data was used for origin computation 5
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 10
Type of magnitude ML
Reference to an origin 89023571
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-11 23:44:48
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MMO1.EHZ. 2021-04-11T23:27:11.73 0.3 undecidable manual S 84 26.5512 50 -0.1 72
IV.GAVE.EHZ. 2021-04-11T23:27:10.46 0.1 undecidable manual S 204 22.0668 115 -0.16 95
IV.FDMO.HHZ. 2021-04-11T23:27:09.55 0.3 undecidable manual S 21 19.2696 118 -0.2 71
IV.CESI.HHZ. 2021-04-11T23:27:08.85 0.1 undecidable manual S 331 16.4724 122 -0.07 98
IV.NRCA.HHZ. 2021-04-11T23:27:07.18 0.1 undecidable manual S 117 10.1787 136 -0.03 100
IV.GAVE.EHZ. 2021-04-11T23:27:07.10 0.1 undecidable manual P 204 22.0668 115 0.06 97
IV.MMO1.EHZ. 2021-04-11T23:27:07.76 0.1 undecidable manual P 84 26.5512 50 0.02 97
IV.CESI.HHZ. 2021-04-11T23:27:06.21 0.1 undecidable manual P 331 16.4724 122 0.15 96
IV.FDMO.HHZ. 2021-04-11T23:27:06.63 0.3 negative manual P 21 19.2696 118 0.1 73
IV.NRCA.HHZ. 2021-04-11T23:27:05.26 0.1 undecidable manual P 117 10.1787 136 0.19 97
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:1.3 0.000242 0.08 AML other m 2021-04-11T23:27:07.52
IV.NRCA.HHE. ML:1.2 0.00017340495 0.1024 AML other m 2021-04-11T23:27:07.61
IV.FDMO.HHN. ML:1.0 0.0000828 0.18 AML other m 2021-04-11T23:27:09.89
IV.FDMO.HHE. ML:1.3 0.00015970703 0.1792 AML other m 2021-04-11T23:27:09.83
IV.GAVE.EHN. ML:1.1 0.00008210539 0.2176 AML other m 2021-04-11T23:27:10.74
IV.GAVE.EHE. ML:1.1 0.0000908 0.98 AML other m 2021-04-11T23:27:11.27
IV.NRCA.HNE. ML:1.2 0.00017828930500000001 0.1024 AML other m 2021-04-11T23:27:07.62
IV.NRCA.HNN. ML:1.3 0.00022053330000000002 0.0768 AML other m 2021-04-11T23:27:07.56
IV.CESI.HHE. ML:0.8 0.000052699095000000005 0.1024 AML other m 2021-04-11T23:27:09.22
IV.CESI.HHN. ML:1.1 0.000101718585 0.2304 AML other m 2021-04-11T23:27:09.18
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