Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 24-09-2020 and time 11:53:14 (UTC) in region 2 km S Spello (PG)

A magnitude ML 1.1 earthquake occured in region: 2 km S Spello (PG), on

  • 24-09-2020 11:53:14 (UTC)
  • 24-09-2020 13:53:14 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.9750, 12.6660 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
Spello PG 2 8645 8645
Foligno PG 4 57155 65800
Bevagna PG 6 5081 70881
Cannara PG 7 4305 75186
Montefalco PG 9 5679 80865
Gualdo Cattaneo PG 11 6155 87020
Assisi PG 12 28299 115319
Valtopina PG 12 1398 116717
Trevi PG 13 8469 125186
Bastia Umbra PG 14 21874 147060
Bettona PG 15 4367 151427
Castel Ritaldi PG 17 3278 154705
Giano dell'Umbria PG 17 3846 158551
Nocera Umbra PG 18 5839 164390
Campello sul Clitunno PG 19 2442 166832
Torgiano PG 20 6725 173557
Deruta PG 20 9669 183226

Municipalities with at least 50000 inhabitants

An earthquake occurred to
4 Km NW of Foligno (57155 inhabitants)
27 Km SE of Perugia (166134 inhabitants)
46 Km N of Terni (111501 inhabitants)
77 Km NE of Viterbo (67173 inhabitants)
84 Km SE of Arezzo (99543 inhabitants)
92 Km NW of L'Aquila (69753 inhabitants)
92 Km W of Teramo (54892 inhabitants)
99 Km SW of Ancona (100861 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 2020-09-24
11:53:14		 42.9747 12.6658 10 2020-09-24
12:05:02		 Sala Sismica INGV-Roma 83196341
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-09-24 11:53:14 ± 0.05
Latitude 42.9747 ± 0.0027
Longitude 12.6658 ± 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 83196341

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 281
Semi-minor axis of confidence ellipse (meter) 260
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 299
Circular confidence region, given by single value of horizontal uncertainty (meter) 280.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 153
Number of associated phases, regardless of their use for origin computation 18
Number of defining phases 12
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) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.41099
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 8
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 83196341
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-09-24 12:05:02
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.RIBO.EHZ.01 2020-09-24T11:53:44.52 3.0 undecidable manual S -0.93 0
IV.APEC.HHZ. 2020-09-24T11:53:26.29 3.0 undecidable manual S 0.33 0
IT.TRN1.HGZ. 2020-09-24T11:53:24.90 3.0 undecidable manual P 0.71 0
IV.CPGN.EHZ. 2020-09-24T11:53:23.57 3.0 undecidable manual P -0.19 0
IV.CSP1.EHZ. 2020-09-24T11:53:22.61 1.0 positive manual P 73 45.621 50 0.01 24
IV.ATCC.EHZ. 2020-09-24T11:53:22.91 0.1 undecidable manual S 355 23.4543 113 0.06 98
IT.GNU.HGN. 2020-09-24T11:53:21.76 0.3 undecidable manual S 202 20.4684 116 -0.16 73
IV.CESI.HHZ. 2020-09-24T11:53:21.63 0.1 undecidable manual S 80 19.6692 117 -0.03 100
IV.GAVE.HNZ. 2020-09-24T11:53:21.22 0.1 undecidable manual P 149 36.4413 50 0.03 97
IV.FDMO.HHZ. 2020-09-24T11:53:20.77 1.0 negative manual P 79 34.8429 50 -0.17 24
IV.FOSV.EHZ. 2020-09-24T11:53:19.42 3.0 undecidable manual P 2.39 0
IT.MTCL.HGE. 2020-09-24T11:53:19.61 0.3 undecidable manual P 85 27.1506 50 -0.14 72
IV.ATCC.EHZ. 2020-09-24T11:53:19.07 0.1 undecidable manual P 355 23.4543 113 -0.05 99
IV.MOMA.HHZ. 2020-09-24T11:53:18.49 3.0 undecidable manual P -1.26 0
IV.ASSB.HHZ. 2020-09-24T11:53:18.24 0.1 undecidable manual S 356 7.5813 143 -0.12 100
IT.GNU.HGN. 2020-09-24T11:53:18.78 0.3 undecidable manual P 202 20.4684 116 0.2 72
IV.CESI.HHZ. 2020-09-24T11:53:18.57 0.1 undecidable manual P 80 19.6692 117 0.14 97
IV.ASSB.HHZ. 2020-09-24T11:53:16.61 0.3 undecidable manual P 356 7.5813 143 0.09 75
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ASSB.HHE. ML:1.1 0.000175 0.18 AML other m 2020-09-24T11:53:18.45
IV.ASSB.HHN. ML:1.2 0.0002065 1 AML other m 2020-09-24T11:53:18.29
IV.MOMA.HHE. ML:0.9 0.0000597 0.4 AML other m 2020-09-24T11:53:22.39
IV.MOMA.HHN. ML:0.9 0.00005885 0.38 AML other m 2020-09-24T11:53:22.76
IV.ATCC.EHN. ML:0.9 0.00005525 1.58 AML other m 2020-09-24T11:53:23.15
IV.ATCC.EHE. ML:1.1 0.000077 1.34 AML other m 2020-09-24T11:53:23.02
IV.APEC.HHE. ML:1.6 0.00007305 0.48 AML other m 2020-09-24T11:53:26.98
IV.APEC.HHN. ML:1.5 0.000055849999999999996 0.08 AML other m 2020-09-24T11:53:27.00
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