Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.0 on date 23-02-2021 and time 13:23:14 (Italy) in region 3 km NW Sellano (PG)

A magnitude ML 1.0 earthquake occured in region: 3 km NW Sellano (PG), on

  • 23-02-2021 12:23:14 (UTC)
  • 23-02-2021 13:23:14 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.91, 12.91 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
Sellano PG 3 1079 1079
Cerreto di Spoleto PG 11 1075 2154
Preci PG 12 724 2878
Monte Cavallo MC 12 145 3023
Trevi PG 13 8469 11492
Campello sul Clitunno PG 15 2442 13934
Visso MC 15 1107 15041
Vallo di Nera PG 16 364 15405
Foligno PG 17 57155 72560
Serravalle di Chienti MC 18 1070 73630
Pieve Torina MC 19 1458 75088
Ussita MC 19 444 75532

Municipalities with at least 50000 inhabitants

An earthquake occurred to
17 Km E of Foligno (57155 inhabitants)
45 Km NE of Terni (111501 inhabitants)
47 Km E of Perugia (166134 inhabitants)
71 Km W of Teramo (54892 inhabitants)
74 Km NW of L'Aquila (69753 inhabitants)
86 Km NE of Viterbo (67173 inhabitants)
93 Km SW of Ancona (100861 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100 		ML 1.0 2021-02-23
12:23:14		 42.91 12.91 10 2021-02-23
12:32:14		 Sala Sismica INGV-Roma 87408651
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-02-23 12:23:14 ± 0.08
Latitude 42.91 ± 0.00
Longitude 12.91 ± 0.01
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 87408651

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 677
Semi-minor axis of confidence ellipse (meter) 276
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 111
Circular confidence region, given by single value of horizontal uncertainty (meter) 680
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 114
Number of associated phases, regardless of their use for origin computation 30
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.24
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.43887
Number of stations at which the event was observed 22
Number of stations from which data was used for origin computation 8
Magnitude information

ML:1

Field Value
Value 1
Uncertainty 0.2
Num. used stations 10
Type of magnitude ML
Reference to an origin 87408651
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-02-23 12:32:14
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.EUCT.HNZ. 2021-02-23T12:24:58.39 3.0 undecidable manual Sg 15.05 0
IV.CADC.HNZ. 2021-02-23T12:24:51.81 3.0 undecidable manual Sg 15.79 0
IV.SPS2.HHZ. 2021-02-23T12:24:36.82 3.0 positive manual Pg 16.98 0
IV.ESCV.HHZ. 2021-02-23T12:24:31.34 3.0 positive manual Pn -0.3 0
IV.USI.HHZ. 2021-02-23T12:24:18.53 3.0 negative manual Pn 3.32 0
IV.TREM.HHZ. 2021-02-23T12:24:17.71 3.0 undecidable manual Sn 1.57 0
IV.SARZ.HHZ. 2021-02-23T12:24:14.42 3.0 undecidable manual Pg 12.38 0
IV.BRSN.EHZ. 2021-02-23T12:23:55.73 3.0 undecidable manual Sg 1.2 0
IV.MNTV.EHZ. 2021-02-23T12:23:54.69 3.0 undecidable manual Pn 2.81 0
IV.MTMR.EHZ. 2021-02-23T12:23:51.97 3.0 negative manual Pn -1.59 0
TV.SF04.EHZ. 2021-02-23T12:23:37.29 3.0 undecidable manual S -0.72 0
IV.EL6.EHZ. 2021-02-23T12:23:30.32 0.3 undecidable manual S 19 0.4389 50 0.4 65
IV.MNTT.EHZ. 2021-02-23T12:23:26.70 3.0 negative manual Pg 1.1 0
IV.CSP1.EHZ. 2021-02-23T12:23:24.95 0.6 undecidable manual S 51 0.2815 50 -0.32 46
IV.MOMA.HNZ. 2021-02-23T12:23:24.41 0.3 undecidable manual S 246 0.2698 50 -0.5 66
IV.APEC.HHZ. 2021-02-23T12:23:23.87 3.0 undecidable manual Pg -0.32 0
IV.GAVE.EHZ. 2021-02-23T12:23:23.30 0.3 undecidable manual S 182 0.2221 112 -0.09 73
IV.EL6.EHZ. 2021-02-23T12:23:22.81 1.0 undecidable manual P 19 0.4389 50 -0.46 22
IV.FDMO.HHZ. 2021-02-23T12:23:21.64 0.6 undecidable manual S 47 0.1808 116 -0.28 47
IV.NRCA.HHZ. 2021-02-23T12:23:21.89 0.6 undecidable manual S 118 0.1727 117 0.23 48
IV.COR1.EHZ. 2021-02-23T12:23:21.77 3.0 undecidable manual P -4.17 0
IV.CSP1.EHZ. 2021-02-23T12:23:20.39 0.6 negative manual P 51 0.2815 50 -0.19 47
IV.MOMA.HNZ. 2021-02-23T12:23:20.87 0.1 undecidable manual P 246 0.2698 50 0.5 88
IV.GAVE.EHZ. 2021-02-23T12:23:19.45 0.1 positive manual P 182 0.2221 112 -0.05 98
IT.MTCL.HGZ. 2021-02-23T12:23:19.38 0.3 undecidable manual S 41 0.1052 130 -0.09 75
IV.CESI.HHZ. 2021-02-23T12:23:18.96 0.6 undecidable manual S 360 0.0908 134 -0.09 50
IV.FDMO.HHZ. 2021-02-23T12:23:18.53 0.6 positive manual P 47 0.1808 116 -0.12 49
IV.NRCA.HHZ. 2021-02-23T12:23:18.58 0.1 negative manual P 118 0.1727 117 0.08 98
IV.CESI.HHZ. 2021-02-23T12:23:17.07 0.1 positive manual P 360 0.0908 134 0.07 100
IT.MTCL.HGZ. 2021-02-23T12:23:17.35 0.1 undecidable manual P 41 0.1052 130 0.12 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CESI.HHN. ML:1 0.000127 0.1 AML other m 2021-02-23T12:23:19.10
IV.CESI.HHE. ML:0.8 8.925E-5 0.16 AML other m 2021-02-23T12:23:19.09
IV.FDMO.HHE. ML:1 7.775E-5 1.26 AML other m 2021-02-23T12:23:21.10
IV.FDMO.HHN. ML:1 8.23E-5 0.16 AML other m 2021-02-23T12:23:21.81
IV.NRCA.HHN. ML:0.8 4.885E-5 0.12 AML other m 2021-02-23T12:23:22.83
IV.NRCA.HHE. ML:0.7 4.085E-5 1.2 AML other m 2021-02-23T12:23:23.28
IV.GAVE.EHE. ML:1.1 8.0926345E-5 0.1216 AML other m 2021-02-23T12:23:23.96
IV.GAVE.EHN. ML:1 5.4282575E-5 0.1216 AML other m 2021-02-23T12:23:24.09
IV.CSP1.EHE. ML:1.2 7.1094265E-5 0.2176 AML other m 2021-02-23T12:23:25.49
IV.CSP1.EHN. ML:1.3 8.493448E-5 0.32 AML other m 2021-02-23T12:23:25.08
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download