Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.0 on date 23-08-2020 and time 05:14:16 (Italy) in region 5 km NW Preci (PG)

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

  • 23-08-2020 03:14:16 (UTC)
  • 23-08-2020 05:14:16 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.9170, 13.0140 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 5 724 724
Visso MC 6 1107 1831
Sellano PG 8 1079 2910
Monte Cavallo MC 9 145 3055
Ussita MC 11 444 3499
Castelsantangelo sul Nera MC 12 281 3780
Cerreto di Spoleto PG 13 1075 4855
Pieve Torina MC 15 1458 6313
Fiordimonte MC 15 202 6515
Norcia PG 15 4957 11472
Pievebovigliana MC 17 866 12338
Fiastra MC 18 559 12897
Serravalle di Chienti MC 18 1070 13967
Acquacanina MC 18 121 14088
Muccia MC 19 915 15003
Bolognola MC 19 142 15145

Municipalities with at least 50000 inhabitants

An earthquake occurred to
26 Km E of Foligno (57155 inhabitants)
50 Km NE of Terni (111501 inhabitants)
55 Km E of Perugia (166134 inhabitants)
63 Km W of Teramo (54892 inhabitants)
70 Km NW of L'Aquila (69753 inhabitants)
88 Km SW of Ancona (100861 inhabitants)
93 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
Bulletin
Rev1000 		ML 1.0 2020-08-23
03:14:16		 42.917 13.0142 11 2020-11-19
12:37:06		 Bollettino Sismico Italiano INGV 84666501
Reviewed
Rev100 		ML 1.0 2020-08-23
03:14:16		 42.9153 13.0152 11 2020-08-23
03:17:58		 Sala Sismica INGV-Roma 82248541
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-08-23 03:14:16 ± 0.04
Latitude 42.9170 ± 0.0018
Longitude 13.0142 ± 0.0049
Depth (km) 11 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 84666501

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 370
Semi-minor axis of confidence ellipse (meter) 160
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 260
Circular confidence region, given by single value of horizontal uncertainty (meter) 370.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 95
Number of associated phases, regardless of their use for origin computation 29
Number of defining phases 26
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) 0.52341
Number of stations at which the event was observed 16
Number of stations from which data was used for origin computation 13
Magnitudes information

ML:1.0

Field Value
Value 1.0
Uncertainty 0.1
Num. used stations 8
Type of magnitude ML
Reference to an origin 84666501
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-11-12 11:19:18

ML:1.0

Field Value
Value 1.0
Uncertainty 0.1
Num. used stations 8
Type of magnitude ML
Reference to an origin 82248541
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-08-23 03:17:58
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.VAGA.HHZ. 2020-08-23T03:15:13.04 3.0 undecidable manual Sg 1.09 0
IV.CIGN.HHZ. 2020-08-23T03:14:47.60 3.0 undecidable manual Pn -2.08 0
IV.LAV9.HHZ. 2020-08-23T03:14:40.05 3.0 undecidable manual P -1.05 0
IV.TERO.HHZ. 2020-08-23T03:14:34.80 0.6 undecidable manual S 124 58.0974 90 0.26 43
IV.ATCC.EHZ. 2020-08-23T03:14:30.87 0.6 undecidable manual S 315 42.5241 90 0.48 43
IV.SNTG.HHZ. 2020-08-23T03:14:29.22 0.6 undecidable manual S 351 37.9287 90 0.04 48
IV.ASSB.HHZ. 2020-08-23T03:14:27.44 0.6 undecidable manual S 296 32.0457 90 -0.16 47
IV.GAVE.EHZ. 2020-08-23T03:14:26.12 0.6 undecidable manual S 201 26.751 90 -0.07 48
IV.TERO.HHZ. 2020-08-23T03:14:26.81 0.3 undecidable manual P 124 58.0974 90 -0.14 67
IV.CSP1.EHZ. 2020-08-23T03:14:25.69 0.6 undecidable manual S 39 24.753 90 0.03 49
IV.MMO1.EHZ. 2020-08-23T03:14:25.65 0.3 undecidable manual S 94 25.4523 90 -0.19 70
IV.ATCC.EHZ. 2020-08-23T03:14:24.54 0.1 undecidable manual P 315 42.5241 90 -0.01 94
IV.SNTG.HHZ. 2020-08-23T03:14:23.74 0.1 undecidable manual P 351 37.9287 90 -0.12 93
IV.FDMO.HHN. 2020-08-23T03:14:22.65 0.6 undecidable manual S 24 14.4744 90 -0.27 47
IV.NRCA.HHZ. 2020-08-23T03:14:22.14 0.3 undecidable manual S 139 12.2766 105 -0.2 72
IV.MC2.EHZ. 2020-08-23T03:14:22.98 0.6 undecidable manual S 92 14.1747 91 0.14 48
IV.CESI.HHZ. 2020-08-23T03:14:22.34 0.6 undecidable manual S 318 13.1757 97 -0.23 47
IV.GAVE.EHZ. 2020-08-23T03:14:22.13 0.3 undecidable manual P 201 26.751 90 0 73
IV.ASSB.HHZ. 2020-08-23T03:14:22.80 0.3 undecidable manual P 296 32.0457 90 -0.14 70
IV.CSP1.EHZ. 2020-08-23T03:14:21.78 0.1 undecidable manual P 39 24.753 90 -0.05 96
IV.MMO1.EHZ. 2020-08-23T03:14:21.94 0.3 undecidable manual P 94 25.4523 90 0.01 73
IV.FEMA.HNE. 2020-08-23T03:14:21.03 0.6 undecidable manual S 30 5.7942 143 0.1 50
IT.MTCL.HGZ. 2020-08-23T03:14:21.22 0.3 undecidable manual S 352 8.5803 127 -0.24 71
IV.FDMO.HHN. 2020-08-23T03:14:20.32 0.1 undecidable manual P 24 14.4744 90 0.08 98
IV.MC2.EHZ. 2020-08-23T03:14:20.43 0.3 undecidable manual P 92 14.1747 91 0.23 71
IV.CESI.HHZ. 2020-08-23T03:14:20.17 0.1 negative manual P 318 13.1757 97 0.13 97
IT.MTCL.HGZ. 2020-08-23T03:14:19.43 0.1 undecidable manual P 352 8.5803 127 0.03 100
IV.NRCA.HHZ. 2020-08-23T03:14:19.91 0.1 undecidable manual P 139 12.2766 105 0 100
IV.FEMA.HNE. 2020-08-23T03:14:19.36 0.3 undecidable manual P 30 5.7942 143 0.27 72
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:1.0 0.000112 0.1 AML other m 2020-08-23T03:14:22.22
IV.NRCA.HHE. ML:0.9 0.00009005 0.14 AML other m 2020-08-23T03:14:22.43
IV.CESI.HHE. ML:0.9 0.0000767 0.16 AML other m 2020-08-23T03:14:22.69
IV.CESI.HHN. ML:1.2 0.000153 0.1 AML other m 2020-08-23T03:14:22.87
IV.GAVE.EHN. ML:0.9 0.0000401 0.2 AML other m 2020-08-23T03:14:26.33
IV.GAVE.EHE. ML:1.0 0.00006025 0.16 AML other m 2020-08-23T03:14:26.49
IV.ASSB.HHN. ML:0.9 0.00003375 0.16 AML other m 2020-08-23T03:14:27.76
IV.ASSB.HHE. ML:0.9 0.00003565 0.18 AML other m 2020-08-23T03:14:27.71
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