Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.0 on date 09-04-2021 and time 20:44:55 (Italy) in region 5 km N Preci (PG)

A magnitude ML 1.0 earthquake occured in region: 5 km N Preci (PG), on

  • 09-04-2021 18:44:55 (UTC)
  • 09-04-2021 20:44:55 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.9200, 13.0270 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 5 724 724
Visso MC 5 1107 1831
Monte Cavallo MC 9 145 1976
Sellano PG 9 1079 3055
Ussita MC 10 444 3499
Castelsantangelo sul Nera MC 11 281 3780
Pieve Torina MC 14 1458 5238
Fiordimonte MC 14 202 5440
Cerreto di Spoleto PG 14 1075 6515
Norcia PG 15 4957 11472
Pievebovigliana MC 17 866 12338
Fiastra MC 17 559 12897
Acquacanina MC 17 121 13018
Serravalle di Chienti MC 18 1070 14088
Muccia MC 18 915 15003
Bolognola MC 18 142 15145

Municipalities with at least 50000 inhabitants

An earthquake occurred to
27 Km E of Foligno (57155 inhabitants)
51 Km NE of Terni (111501 inhabitants)
56 Km E of Perugia (166134 inhabitants)
63 Km W of Teramo (54892 inhabitants)
70 Km NW of L'Aquila (69753 inhabitants)
87 Km SW of Ancona (100861 inhabitants)
94 Km NE of Viterbo (67173 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 2021-04-09
18:44:55		 42.9202 13.0268 11 2021-04-09
18:50:33		 Sala Sismica INGV-Roma 88948881
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-09 18:44:55 ± 0.06
Latitude 42.9202 ± 0.0036
Longitude 13.0268 ± 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 88948881

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 454
Semi-minor axis of confidence ellipse (meter) 276
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 52
Circular confidence region, given by single value of horizontal uncertainty (meter) 450.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 110
Number of associated phases, regardless of their use for origin computation 13
Number of defining phases 13
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) 0.04497
Epicentral distance of station farthest from the epicenter (degree) 0.24731
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:1.0

Field Value
Value 1.0
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 88948881
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-09 18:50:33
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MC2.EHZ. 2021-04-09T18:45:01.21 0.6 undecidable manual S 94 13.1757 128 0.35 47
IV.CSP1.EHZ. 2021-04-09T18:45:00.14 0.6 undecidable manual P 37 23.8539 50 -0.05 49
IV.GAVE.EHZ. 2021-04-09T18:45:00.80 0.3 positive manual P 203 27.4503 50 0.05 73
IV.CESI.HHZ. 2021-04-09T18:45:00.90 0.6 undecidable manual S 313 13.6752 127 -0.09 49
IV.NRCA.HHZ. 2021-04-09T18:45:00.28 0.6 undecidable manual S 143 11.9769 131 -0.25 48
IV.MMO1.EHZ. 2021-04-09T18:45:00.19 0.3 undecidable manual P 95 24.4533 50 -0.1 72
IV.FDMO.HHZ. 2021-04-09T18:45:00.87 0.6 undecidable manual S 21 13.7751 127 -0.16 48
IV.NRCA.HHZ. 2021-04-09T18:44:58.18 0.1 undecidable manual P 143 11.9769 131 -0.02 100
IV.FDMO.HHZ. 2021-04-09T18:44:58.51 0.3 positive manual P 21 13.7751 127 0.02 75
IV.MC2.EHZ. 2021-04-09T18:44:58.54 1.0 negative manual P 94 13.1757 128 0.15 24
IV.FEMA.HNN. 2021-04-09T18:44:58.92 0.6 undecidable manual S 22 4.995 154 -0.12 50
IV.CESI.HHZ. 2021-04-09T18:44:58.63 0.3 positive manual P 313 13.6752 127 0.17 73
IV.FEMA.HNN. 2021-04-09T18:44:57.43 0.3 undecidable manual P 22 4.995 154 0.09 75
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:1.1 0.00015177150000000002 0.1664 AML other m 2021-04-09T18:45:00.41
IV.NRCA.HHE. ML:1.0 0.00010206859500000001 0.1024 AML other m 2021-04-09T18:45:00.96
IV.CESI.HHE. ML:0.7 0.0000477 0.1 AML other m 2021-04-09T18:45:01.03
IV.FDMO.HHE. ML:1.1 0.00011891388499999999 0.2432 AML other m 2021-04-09T18:45:00.99
IV.CESI.HHN. ML:0.8 0.0000645 0.16 AML other m 2021-04-09T18:45:01.27
IV.FDMO.HHN. ML:0.7 0.00004760867 0.1152 AML other m 2021-04-09T18:45:01.45
IV.NRCA.HNN. ML:1.2 0.00017796920499999998 0.7296 AML other m 2021-04-09T18:45:05.22
IV.CESI.HNN. ML:1.1 0.00011881684000000001 0.3584 AML other m 2021-04-09T18:45:15.47
IV.GAVE.EHE. ML:1.0 0.00005465021 0.1664 AML other m 2021-04-09T18:45:05.62
IV.GAVE.EHN. ML:0.8 0.00003348827 0.2176 AML other m 2021-04-09T18:45:05.69
IV.GAVE.HNE. ML:1.4 0.00014392915 0.6656 AML other m 2021-04-09T18:45:02.65
IV.GAVE.HNN. ML:1.6 0.00019959186 0.6144 AML other m 2021-04-09T18:45:33.23
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