Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.8 on date 30-09-2021 and time 03:41:55 (UTC) in region 2 km N Preci (PG)

A magnitude ML 0.8 earthquake occured in region: 2 km N Preci (PG), on

  • 30-09-2021 03:41:55 (UTC)
  • 30-09-2021 05:41:55 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.9000, 13.0460 at 11 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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 2 724 724
Visso MC 5 1107 1831
Castelsantangelo sul Nera MC 9 281 2112
Ussita MC 9 444 2556
Sellano PG 10 1079 3635
Monte Cavallo MC 11 145 3780
Norcia PG 13 4957 8737
Cerreto di Spoleto PG 14 1075 9812
Fiordimonte MC 16 202 10014
Pieve Torina MC 16 1458 11472
Fiastra MC 18 559 12031
Acquacanina MC 18 121 12152
Bolognola MC 18 142 12294
Pievebovigliana MC 18 866 13160

Municipalities with at least 50000 inhabitants

An earthquake occurred to
29 Km E of Foligno (57155 inhabitants)
50 Km NE of Terni (111501 inhabitants)
58 Km E of Perugia (166134 inhabitants)
60 Km W of Teramo (54892 inhabitants)
68 Km NW of L'Aquila (69753 inhabitants)
89 Km SW of Ancona (100861 inhabitants)
94 Km NE of Viterbo (67173 inhabitants)
100 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
Bulletin
Rev1000 		ML 0.8 2021-09-30
03:41:55		 42.9003 13.0455 11 2022-03-30
13:04:09		 Bollettino Sismico Italiano INGV 96288161
Reviewed
Rev100 		ML 0.8 2021-09-30
03:41:55		 42.8988 13.0473 11 2021-09-30
03:48:45		 Sala Sismica INGV-Roma 96049181
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-30 03:41:55 ± 0.04
Latitude 42.9003 ± 0.0018
Longitude 13.0455 ± 0.0037
Depth (km) 11 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 96288161

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 320
Semi-minor axis of confidence ellipse (meter) 228
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 84
Circular confidence region, given by single value of horizontal uncertainty (meter) 320.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 60
Number of associated phases, regardless of their use for origin computation 24
Number of defining phases 24
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.16
Epicentral distance of station closest to the epicenter (degree) 0.08364
Epicentral distance of station farthest from the epicenter (degree) 0.36153
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 13
Magnitudes information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.3
Num. used stations 6
Type of magnitude ML
Reference to an origin 96049181
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-30 03:48:45

ML:0.8

Field Value
Value 0.8
Uncertainty 0.3
Num. used stations 6
Type of magnitude ML
Reference to an origin 96288161
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-10-06 12:23:33
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.LNSS.HNZ. 2021-09-30T03:42:07.17 0.3 undecidable manual S 181 33.0447 50 0.06 72
IV.PF6.EHZ. 2021-09-30T03:42:05.94 0.6 undecidable manual S 25 28.9488 50 -0.09 48
IV.GAVE.EHZ. 2021-09-30T03:42:05.07 0.6 undecidable manual S 208 26.1516 50 -0.21 47
IV.MML1.EHZ. 2021-09-30T03:42:04.97 0.3 undecidable manual S 346 24.3534 50 0.16 71
IV.CSP1.EHZ. 2021-09-30T03:42:04.95 0.3 undecidable manual S 31 24.8529 50 0.01 74
IV.MMO1.EHZ. 2021-09-30T03:42:04.32 0.3 undecidable manual S 90 22.8549 50 -0.08 73
IV.MOMA.HNZ. 2021-09-30T03:42:03.79 0.3 undecidable manual P 255 40.1265 50 0.36 67
IV.FDMO.HHZ. 2021-09-30T03:42:02.20 0.6 undecidable manual S 13 15.4734 125 -0.18 48
IV.LNSS.HNZ. 2021-09-30T03:42:02.29 0.1 undecidable manual P 181 33.0447 50 -0.04 96
IV.CESI.HHZ. 2021-09-30T03:42:02.44 0.3 undecidable manual S 315 16.2726 124 -0.17 72
IV.MC2.EHZ. 2021-09-30T03:42:01.70 0.3 undecidable manual S 84 11.6772 133 0.34 70
IV.GUMA.HNZ. 2021-09-30T03:42:01.42 0.6 undecidable manual P 52 29.6481 50 -0.39 45
IV.MML1.EHZ. 2021-09-30T03:42:01.02 0.3 undecidable manual P 346 24.3534 50 0.02 74
IV.CSP1.EHZ. 2021-09-30T03:42:01.12 0.3 undecidable manual P 31 24.8529 50 0.04 73
IV.PF6.EHZ. 2021-09-30T03:42:01.68 0.1 undecidable manual P 25 28.9488 50 -0.03 97
IV.GAVE.EHZ. 2021-09-30T03:42:01.27 0.3 undecidable manual P 208 26.1516 50 -0.01 98
IV.MMO1.EHZ. 2021-09-30T03:42:00.64 0.1 undecidable manual P 90 22.8549 50 -0.13 96
IT.MTCL.HGZ. 2021-09-30T03:42:00.92 0.6 undecidable manual S 340 11.0778 135 -0.27 48
IV.NRCA.HHZ. 2021-09-30T03:42:00.45 0.3 undecidable manual S 143 9.2796 140 -0.32 71
IV.MC2.EHZ. 2021-09-30T03:41:59.19 0.1 undecidable manual P 84 11.6772 133 0.18 97
IV.FDMO.HHZ. 2021-09-30T03:41:59.69 0.1 undecidable manual P 13 15.4734 125 0.09 98
IV.CESI.HHZ. 2021-09-30T03:41:59.78 0.3 undecidable manual P 315 16.2726 124 0.05 74
IT.MTCL.HGZ. 2021-09-30T03:41:58.95 0.1 undecidable manual P 340 11.0778 135 0.04 100
IV.NRCA.HHZ. 2021-09-30T03:41:58.77 0.1 undecidable manual P 143 9.2796 140 0.1 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:1.2 0.0002055 0.16 AML other m 2021-09-30T03:42:00.59
IV.NRCA.HHE. ML:1.0 0.0001275 0.42 AML other m 2021-09-30T03:42:00.64
IV.FDMO.HHN. ML:0.5 0.000029749999999999998 0.98 AML other m 2021-09-30T03:42:02.31
IV.FDMO.HHE. ML:0.8 0.0000552 0.24 AML other m 2021-09-30T03:42:02.59
IV.CESI.HHN. ML:0.7 0.00004635 1.44 AML other m 2021-09-30T03:42:02.95
IV.CESI.HHE. ML:0.5 0.000025500000000000003 0.22 AML other m 2021-09-30T03:42:02.96
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