Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.0 on date 17-08-2021 and time 07:41:17 (Italy) in region 4 km NW Preci (PG)

A magnitude ML 1.0 earthquake occured in region: 4 km NW Preci (PG), on

  • 17-08-2021 05:41:17 (UTC)
  • 17-08-2021 07:41:17 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.9020, 12.9960 at 11 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 4 724 724
Sellano PG 6 1079 1803
Visso MC 8 1107 2910
Monte Cavallo MC 10 145 3055
Cerreto di Spoleto PG 11 1075 4130
Ussita MC 13 444 4574
Castelsantangelo sul Nera MC 13 281 4855
Norcia PG 15 4957 9812
Pieve Torina MC 17 1458 11270
Fiordimonte MC 17 202 11472
Vallo di Nera PG 18 364 11836
Pievebovigliana MC 19 866 12702
Serravalle di Chienti MC 19 1070 13772
Fiastra MC 20 559 14331
Campello sul Clitunno PG 20 2442 16773

Municipalities with at least 50000 inhabitants

An earthquake occurred to
25 Km E of Foligno (57155 inhabitants)
47 Km NE of Terni (111501 inhabitants)
54 Km E of Perugia (166134 inhabitants)
64 Km W of Teramo (54892 inhabitants)
70 Km NW of L'Aquila (69753 inhabitants)
90 Km SW of Ancona (100861 inhabitants)
91 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 2021-08-17
05:41:17		 42.9025 12.9962 11 2021-08-17
05:49:31		 Sala Sismica INGV-Roma 94284551
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-17 05:41:17 ± 0.1
Latitude 42.9025 ± 0.0036
Longitude 12.9962 ± 0.0098
Depth (km) 11 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 94284551

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 813
Semi-minor axis of confidence ellipse (meter) 295
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 107
Circular confidence region, given by single value of horizontal uncertainty (meter) 810.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 186
Number of associated phases, regardless of their use for origin computation 13
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) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.24282
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 5
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 94284551
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-17 05:49:31
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.TOLF.HHZ. 2021-08-17T05:41:54.87 3.0 undecidable manual S 0.08 0
IV.SACS.HHZ. 2021-08-17T05:41:44.23 3.0 undecidable manual S -0.13 0
IV.NARO.HHZ. 2021-08-17T05:41:42.84 3.0 undecidable manual S -0.6 0
IV.CSP1.EHZ. 2021-08-17T05:41:26.62 0.3 undecidable manual S 39 26.9508 50 -0.11 73
IV.GAVE.EHZ. 2021-08-17T05:41:26.19 0.1 undecidable manual S 200 24.753 50 0.05 99
IV.MC2.EHZ. 2021-08-17T05:41:23.79 0.3 undecidable manual S 86 15.6732 125 0.16 74
IV.FDMO.HHZ. 2021-08-17T05:41:23.78 0.3 undecidable manual S 26 16.5723 123 -0.11 75
IV.NRCA.HHZ. 2021-08-17T05:41:22.40 0.3 undecidable manual S 128 12.2766 131 -0.29 72
IV.GAVE.EHZ. 2021-08-17T05:41:22.24 0.1 undecidable manual P 200 24.753 50 -0.04 100
IV.CSP1.EHZ. 2021-08-17T05:41:22.63 0.1 undecidable manual P 39 26.9508 50 0 100
IV.FDMO.HHZ. 2021-08-17T05:41:21.09 0.6 positive manual P 26 16.5723 123 0.1 50
IV.MC2.EHZ. 2021-08-17T05:41:21.03 0.1 undecidable manual P 86 15.6732 125 0.19 98
IV.NRCA.HHZ. 2021-08-17T05:41:20.32 0.6 undecidable manual P 128 12.2766 131 0.03 51
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:0.7 0.000056107210000000005 0.0992 AML other m 2021-08-17T05:41:22.46
IV.NRCA.HHE. ML:0.9 0.000084846015 0.0992 AML other m 2021-08-17T05:41:23.14
IV.FDMO.HHN. ML:0.9 0.0000746 0.14 AML other m 2021-08-17T05:41:24.09
IV.FDMO.HHE. ML:1.1 0.0001022 1.88 AML other m 2021-08-17T05:41:24.04
IV.NRCA.HNE. ML:1.0 0.000092803095 0.1184 AML other m 2021-08-17T05:41:23.14
IV.NRCA.HNN. ML:1.1 0.000125678815 0.9408 AML other m 2021-08-17T05:41:20.14
IV.GAVE.EHE. ML:0.7 0.0000321601 0.1408 AML other m 2021-08-17T05:41:26.70
IV.GAVE.EHN. ML:0.7 0.000029512295 0.1984 AML other m 2021-08-17T05:41:26.34
IV.GAVE.HNE. ML:1.3 0.0001253936 0.8576 AML other m 2021-08-17T05:41:30.91
IV.GAVE.HNN. ML:1.5 0.00020336094999999998 1.0688 AML other m 2021-08-17T05:41:34.60
IV.CSP1.EHE. ML:1.4 0.000120611895 1.8432 AML other m 2021-08-17T05:41:34.93
IV.CSP1.EHN. ML:1.3 0.00011118473 1.68 AML other m 2021-08-17T05:41:36.81
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