Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.0 on date 20-02-2021 and time 12:08:21 (UTC) in region 1 km W Preci (PG)

A magnitude ML 1.0 earthquake occured in region: 1 km W Preci (PG), on

  • 20-02-2021 12:08:21 (UTC)
  • 20-02-2021 13:08:21 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.8820, 13.0300 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 1 724 724
Visso MC 7 1107 1831
Sellano PG 8 1079 2910
Castelsantangelo sul Nera MC 10 281 3191
Norcia PG 11 4957 8148
Ussita MC 11 444 8592
Cerreto di Spoleto PG 12 1075 9667
Monte Cavallo MC 13 145 9812
Fiordimonte MC 18 202 10014
Pieve Torina MC 18 1458 11472
Cascia PG 18 3217 14689
Vallo di Nera PG 18 364 15053

Municipalities with at least 50000 inhabitants

An earthquake occurred to
28 Km E of Foligno (57155 inhabitants)
47 Km NE of Terni (111501 inhabitants)
58 Km E of Perugia (166134 inhabitants)
60 Km W of Teramo (54892 inhabitants)
66 Km NW of L'Aquila (69753 inhabitants)
91 Km SW of Ancona (100861 inhabitants)
92 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 2021-02-20
12:08:21		 42.8823 13.0297 11 2021-02-20
12:17:42		 Sala Sismica INGV-Roma 87320381
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-02-20 12:08:21 ± 0.05
Latitude 42.8823 ± 0.0027
Longitude 13.0297 ± 0.0037
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 87320381

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 336
Semi-minor axis of confidence ellipse (meter) 315
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 63
Circular confidence region, given by single value of horizontal uncertainty (meter) 340.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 93
Number of associated phases, regardless of their use for origin computation 18
Number of defining phases 18
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.18
Epicentral distance of station closest to the epicenter (degree) 0.07914
Epicentral distance of station farthest from the epicenter (degree) 0.44966
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 9
Magnitude information

ML:1.0

Field Value
Value 1.0
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 87320381
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-02-20 12:17:42
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.EL6.EHZ. 2021-02-20T12:08:38.17 0.3 undecidable manual S 7 49.9167 50 0.59 62
IV.ASSB.HHZ. 2021-02-20T12:08:33.58 0.3 undecidable manual S 301 34.9428 50 -0.01 73
IV.CSP1.EHZ. 2021-02-20T12:08:31.47 0.3 undecidable manual S 31 27.2505 50 -0.06 73
IV.EL6.EHZ. 2021-02-20T12:08:30.87 0.1 undecidable manual P 7 49.9167 50 -0.01 95
IV.GAVE.EHZ. 2021-02-20T12:08:30.71 0.3 undecidable manual S 208 23.754 50 0.1 73
IV.MMO1.EHZ. 2021-02-20T12:08:30.51 0.3 undecidable manual S 85 24.2535 50 -0.21 71
IV.CESI.HHZ. 2021-02-20T12:08:28.66 0.3 undecidable manual S 323 16.9719 122 -0.05 75
IV.FDMO.HHZ. 2021-02-20T12:08:28.72 0.3 undecidable manual S 15 17.7711 121 -0.22 72
IV.ASSB.HHZ. 2021-02-20T12:08:28.41 0.1 undecidable manual P 301 34.9428 50 -0.17 94
IV.CSP1.EHZ. 2021-02-20T12:08:27.31 0.1 undecidable manual P 31 27.2505 50 -0.08 97
IV.MC2.EHZ. 2021-02-20T12:08:27.94 0.3 undecidable manual S 76 13.3755 129 0.25 72
IV.GAVE.EHZ. 2021-02-20T12:08:26.87 0.1 undecidable manual P 208 23.754 50 0.01 99
IV.MMO1.EHZ. 2021-02-20T12:08:26.80 0.1 undecidable manual P 85 24.2535 50 -0.12 97
IV.NRCA.HHZ. 2021-02-20T12:08:26.43 0.3 undecidable manual S 128 8.7801 141 -0.13 75
IV.MC2.EHZ. 2021-02-20T12:08:25.33 0.1 undecidable manual P 76 13.3755 129 0.15 98
IV.CESI.HHZ. 2021-02-20T12:08:25.83 0.1 positive manual P 323 16.9719 122 0.06 99
IV.FDMO.HHZ. 2021-02-20T12:08:25.80 0.1 undecidable manual P 15 17.7711 121 -0.09 99
IV.NRCA.HHZ. 2021-02-20T12:08:24.62 0.1 undecidable manual P 128 8.7801 141 0.1 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:1.5 0.000452 0.38 AML other m 2021-02-20T12:08:26.56
IV.NRCA.HHN. ML:1.4 0.00035299999999999996 0.1 AML other m 2021-02-20T12:08:26.83
IV.CESI.HHN. ML:1.2 0.000131 1.86 AML other m 2021-02-20T12:08:28.00
IV.FDMO.HHE. ML:1.0 0.0000882 1.82 AML other m 2021-02-20T12:08:28.04
IV.CESI.HHE. ML:1.0 0.00007664999999999999 1.48 AML other m 2021-02-20T12:08:29.23
IV.FDMO.HHN. ML:0.8 0.000052000000000000004 1.32 AML other m 2021-02-20T12:08:29.90
IV.ASSB.HHE. ML:0.7 0.000022100000000000002 0.28 AML other m 2021-02-20T12:08:34.19
IV.ASSB.HHN. ML:0.8 0.00002655 0.78 AML other m 2021-02-20T12:08:34.93
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