Earthquake with magnitude of ML 0.5 on date 20-09-2020 and time 23:13:47 (Italy) in region 5 km W Sellano (PG)

A magnitude ML 0.5 earthquake occured in region: 5 km W Sellano (PG), on

  • 20-09-2020 21:13:47 (UTC)
  • 20-09-2020 23:13:47 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.87, 12.87 at 13 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.

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 5 1079 1079
Cerreto di Spoleto PG 7 1075 2154
Campello sul Clitunno PG 9 2442 4596
Trevi PG 10 8469 13065
Vallo di Nera PG 11 364 13429
Preci PG 14 724 14153
Sant'Anatolia di Narco PG 16 564 14717
Foligno PG 16 57155 71872
Castel Ritaldi PG 17 3278 75150
Monte Cavallo MC 17 145 75295
Montefalco PG 18 5679 80974
Scheggino PG 18 461 81435
Spoleto PG 19 38218 119653
Poggiodomo PG 19 117 119770
Visso MC 19 1107 120877

Municipalities with at least 50000 inhabitants

An earthquake occurred to
16 Km SE of Foligno (57155 inhabitants)
39 Km NE of Terni (111501 inhabitants)
47 Km SE of Perugia (166134 inhabitants)
72 Km NW of L'Aquila (69753 inhabitants)
72 Km W of Teramo (54892 inhabitants)
80 Km NE of Viterbo (67173 inhabitants)
98 Km N of Guidonia Montecelio (88673 inhabitants)
98 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 0.5 2020-09-20
21:13:47
42.87 12.87 13 2020-09-20
21:20:14
Sala Sismica INGV-Roma 83080041
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-09-20 21:13:47 ± 0.07
Latitude 42.87 ± 0.00
Longitude 12.87 ± 0.01
Depth (km) 13 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 83080041

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 563
Semi-minor axis of confidence ellipse (meter) 187
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 270
Circular confidence region, given by single value of horizontal uncertainty (meter) 560
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 79
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) 0.18
Epicentral distance of station closest to the epicenter (degree) 0.1358
Epicentral distance of station farthest from the epicenter (degree) 0.23023
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitude information

ML:0.5

Field Value
Value 0.5
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 83080041
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-09-20 21:20:14
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.FDMO.HHZ. 2020-09-20T21:13:57.14 0.3 undecidable manual S 44 0.2293 100 0.04 75
IV.ASSB.HHZ. 2020-09-20T21:13:56.95 0.3 undecidable manual S 318 0.2302 100 -0.17 73
IV.GAVE.EHZ. 2020-09-20T21:13:55.61 0.1 undecidable manual S 174 0.1799 105 -0.08 100
IV.NRCA.HNE. 2020-09-20T21:13:55.71 0.3 undecidable manual S 102 0.1835 105 -0.07 76
IT.MTCL.HGE. 2020-09-20T21:13:54.72 0.3 undecidable manual S 38 0.1547 111 -0.25 73
IV.CESI.HHZ. 2020-09-20T21:13:54.59 0.3 undecidable manual S 11 0.1358 116 0.15 75
IV.ASSB.HHZ. 2020-09-20T21:13:53.34 0.6 undecidable manual P 318 0.2302 100 0.16 50
IV.FDMO.HHZ. 2020-09-20T21:13:53.28 0.3 undecidable manual P 44 0.2293 100 0.11 75
IV.NRCA.HNE. 2020-09-20T21:13:52.44 0.3 undecidable manual P 102 0.1835 105 0.03 76
IV.MOMA.HHN. 2020-09-20T21:13:52.99 0.6 undecidable manual P 253 0.2293 100 -0.18 48
IV.GAVE.EHZ. 2020-09-20T21:13:52.53 0.3 negative manual P 174 0.1799 105 0.18 75
IT.MTCL.HGE. 2020-09-20T21:13:52.01 0.3 undecidable manual P 38 0.1547 111 0.07 76
IV.CESI.HHZ. 2020-09-20T21:13:51.85 0.1 positive manual P 11 0.1358 116 0.21 99
IV.FEMA.HNE. 2020-09-20T21:13:51.48 0.6 undecidable manual P 56 0.1601 109 -0.55 45
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CESI.HHE. ML:0.5 2.417868E-5 0.1024 AML other m 2020-09-20T21:13:54.81
IV.CESI.HHN. ML:0.6 3.1197295E-5 0.1408 AML other m 2020-09-20T21:13:54.00
IV.GAVE.EHE. ML:1 5.9752365E-5 0.1536 AML other m 2020-09-20T21:13:56.80
IV.GAVE.EHN. ML:1 6.425633E-5 0.1536 AML other m 2020-09-20T21:13:56.70
IV.FDMO.HHE. ML:0.3 1.1845448E-5 0.1792 AML other m 2020-09-20T21:13:58.24
IV.FDMO.HHN. ML:0.3 1.0286728E-5 0.1536 AML other m 2020-09-20T21:13:57.81
IV.ASSB.HHE. ML:0.4 1.480508E-5 0.1792 AML other m 2020-09-20T21:13:57.52
IV.ASSB.HHN. ML:0.7 2.685565E-5 0.2176 AML other m 2020-09-20T21:13:57.45
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