Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 01-02-2021 and time 05:15:59 (UTC) in region 4 km E Valtopina (PG)

A magnitude ML 1.1 earthquake occured in region: 4 km E Valtopina (PG), on

  • 01-02-2021 05:15:59 (UTC)
  • 01-02-2021 06:15:59 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.0520, 12.8020 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
Valtopina PG 4 1398 1398
Nocera Umbra PG 7 5839 7237
Spello PG 12 8645 15882
Serravalle di Chienti MC 13 1070 16952
Foligno PG 13 57155 74107
Assisi PG 15 28299 102406
Sefro MC 16 422 102828
Monte Cavallo MC 17 145 102973
Fiuminata MC 19 1402 104375
Cannara PG 19 4305 108680
Trevi PG 20 8469 117149
Gualdo Tadino PG 20 15208 132357

Municipalities with at least 50000 inhabitants

An earthquake occurred to
13 Km NE of Foligno (57155 inhabitants)
34 Km E of Perugia (166134 inhabitants)
56 Km N of Terni (111501 inhabitants)
86 Km NW of Teramo (54892 inhabitants)
86 Km SW of Ancona (100861 inhabitants)
88 Km SE of Arezzo (99543 inhabitants)
90 Km S of Fano (60888 inhabitants)
91 Km NE of Viterbo (67173 inhabitants)
92 Km NW of L'Aquila (69753 inhabitants)
96 Km S of Pesaro (94582 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 1.1 2021-02-01
05:15:59		 43.0518 12.8023 10 2021-02-01
06:17:39		 Sala Sismica INGV-Roma 86754251
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-02-01 05:15:59 ± 0.06
Latitude 43.0518 ± 0.0045
Longitude 12.8023 ± 0.0037
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 86754251

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 476
Semi-minor axis of confidence ellipse (meter) 166
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 196
Circular confidence region, given by single value of horizontal uncertainty (meter) 480.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 143
Number of associated phases, regardless of their use for origin computation 14
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.12
Epicentral distance of station closest to the epicenter (degree) 0.08813
Epicentral distance of station farthest from the epicenter (degree) 0.35253
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.0
Num. used stations 2
Type of magnitude ML
Reference to an origin 86754251
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-02-01 06:17:39
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.EL6.EHZ. 2021-02-01T05:16:13.39 0.6 undecidable manual S 38 39.1275 50 0.31 45
IV.CSP1.EHZ. 2021-02-01T05:16:11.41 0.6 undecidable manual S 82 32.9448 50 -0.01 48
IV.FDMO.HHZ. 2021-02-01T05:16:08.46 0.3 undecidable manual S 94 23.1546 113 -0.2 71
IV.ATCC.EHZ. 2021-02-01T05:16:07.61 0.6 undecidable manual S 318 19.7691 117 0.02 49
IV.EL6.EHZ. 2021-02-01T05:16:07.37 0.1 undecidable manual P 38 39.1275 50 -0.15 93
IV.MML1.HNZ. 2021-02-01T05:16:06.20 0.6 undecidable manual S 63 15.3735 123 -0.05 49
IV.CSP1.EHZ. 2021-02-01T05:16:06.46 0.3 undecidable manual P 82 32.9448 50 -0.09 71
IV.ASSB.HHZ. 2021-02-01T05:16:05.10 0.6 undecidable manual S 265 11.6772 130 -0.13 49
IV.ATCC.EHZ. 2021-02-01T05:16:04.33 0.1 undecidable manual P 318 19.7691 117 -0.02 99
IV.CESI.HHZ. 2021-02-01T05:16:04.79 0.6 undecidable manual S 122 9.7791 135 0.04 50
IV.FDMO.HHZ. 2021-02-01T05:16:04.99 0.3 undecidable manual P 94 23.1546 113 0.03 73
IV.ASSB.HHZ. 2021-02-01T05:16:03.01 0.1 undecidable manual P 265 11.6772 130 0.03 100
IV.MML1.HNZ. 2021-02-01T05:16:03.63 0.1 undecidable manual P 63 15.3735 123 0.06 99
IV.CESI.HHZ. 2021-02-01T05:16:02.89 0.1 negative manual P 122 9.7791 135 0.19 97
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ASSB.HHE. ML:1.1 0.00014450000000000002 0.14 AML other m 2021-02-01T05:16:05.51
IV.ASSB.HHN. ML:1.1 0.00013350000000000002 0.12 AML other m 2021-02-01T05:16:05.49
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