Earthquake with magnitude of ML 1.1 on date 18-09-2021 and time 04:33:12 (Italy) in region 7 km NW Sellano (PG)

A magnitude ML 1.1 earthquake occured in region: 7 km NW Sellano (PG), on

  • 18-09-2021 02:33:12 (UTC)
  • 18-09-2021 04:33:12 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.924, 12.856 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.

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 7 1079 1079
Trevi PG 10 8469 9548
Cerreto di Spoleto PG 13 1075 10623
Foligno PG 13 57155 67778
Campello sul Clitunno PG 13 2442 70220
Monte Cavallo MC 14 145 70365
Preci PG 16 724 71089
Montefalco PG 17 5679 76768
Spello PG 17 8645 85413
Vallo di Nera PG 17 364 85777
Valtopina PG 17 1398 87175
Serravalle di Chienti MC 18 1070 88245
Castel Ritaldi PG 19 3278 91523
Visso MC 19 1107 92630

Municipalities with at least 50000 inhabitants

An earthquake occurred to
13 Km E of Foligno (57155 inhabitants)
43 Km E of Perugia (166134 inhabitants)
44 Km NE of Terni (111501 inhabitants)
75 Km W of Teramo (54892 inhabitants)
78 Km NW of L'Aquila (69753 inhabitants)
83 Km NE of Viterbo (67173 inhabitants)
94 Km SW of Ancona (100861 inhabitants)
99 Km SE of Arezzo (99543 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web 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 1.1 2021-09-18
02:33:12
42.9243 12.8557 10 2021-09-18
02:39:24
Sala Sismica INGV-Roma 95564481
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-18 02:33:12 ± 0.06
Latitude 42.9243 ± 0.0027
Longitude 12.8557 ± 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 95564481

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 297
Semi-minor axis of confidence ellipse (meter) 259
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 199
Circular confidence region, given by single value of horizontal uncertainty (meter) 300
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 69
Number of associated phases, regardless of their use for origin computation 24
Number of defining phases 24
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.22
Epicentral distance of station closest to the epicenter (degree) 0.08813
Epicentral distance of station farthest from the epicenter (degree) 0.41549
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 12
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 16
Type of magnitude ML
Reference to an origin 95564481
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-18 02:39:24
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.MURB.HHZ. 2021-09-18T02:33:28.20 0.1 undecidable manual S 325 0.4155 50 0.83 76
IV.MMO1.EHZ. 2021-09-18T02:33:25.36 0.1 undecidable manual S 94 0.3453 50 0.07 96
IV.CSP1.EHZ. 2021-09-18T02:33:24.08 0.1 undecidable manual S 57 0.3049 50 -0.01 98
IV.SNTG.HHZ. 2021-09-18T02:33:24.67 0.1 undecidable manual S 11 0.3363 50 -0.34 91
IV.ATCC.EHZ. 2021-09-18T02:33:23.95 0.1 undecidable manual S 329 0.3049 50 -0.12 96
IV.MOMA.HHZ. 2021-09-18T02:33:22.23 0.1 undecidable manual S 240 0.241 50 0.03 99
IV.MML1.EHZ. 2021-09-18T02:33:21.08 0.1 undecidable manual S 24 0.2068 113 0.1 98
IV.NRCA.HHZ. 2021-09-18T02:33:21.08 0.1 undecidable manual S 116 0.2104 113 0 100
IV.GAVE.EHZ. 2021-09-18T02:33:21.88 0.1 undecidable manual S 173 0.2338 111 -0.05 99
IV.MURB.HHZ. 2021-09-18T02:33:20.90 0.6 undecidable manual P 325 0.4155 50 -0.1 47
IV.FDMO.HHZ. 2021-09-18T02:33:20.63 0.1 undecidable manual S 56 0.2032 114 -0.21 96
IV.MMO1.EHZ. 2021-09-18T02:33:19.93 1.0 negative manual P 94 0.3453 50 0.13 24
IV.CSP1.EHZ. 2021-09-18T02:33:19.03 0.1 undecidable manual P 57 0.3049 50 -0.08 97
IV.ASSB.HHZ. 2021-09-18T02:33:19.97 0.1 undecidable manual S 309 0.1862 115 -0.28 95
IV.SNTG.HHZ. 2021-09-18T02:33:19.42 0.6 positive manual P 11 0.3363 50 -0.22 47
IV.MOMA.HHZ. 2021-09-18T02:33:18.15 0.6 positive manual P 240 0.241 50 0.13 48
IV.ATCC.EHZ. 2021-09-18T02:33:18.89 0.3 positive manual P 329 0.3049 50 -0.21 71
IV.GAVE.EHZ. 2021-09-18T02:33:17.81 0.1 undecidable manual P 173 0.2338 111 -0.05 99
IV.FDMO.HHZ. 2021-09-18T02:33:17.15 0.6 positive manual P 56 0.2032 114 -0.08 49
IV.CESI.HHZ. 2021-09-18T02:33:17.38 0.1 undecidable manual S 24 0.0881 135 0.27 97
IV.MML1.EHZ. 2021-09-18T02:33:17.20 0.6 positive manual P 24 0.2068 113 -0.11 49
IV.NRCA.HHZ. 2021-09-18T02:33:17.49 0.1 undecidable manual P 116 0.2104 113 0.12 98
IV.ASSB.HHZ. 2021-09-18T02:33:16.76 0.1 positive manual P 309 0.1862 115 -0.13 98
IV.CESI.HHZ. 2021-09-18T02:33:15.38 0.1 undecidable manual P 24 0.0881 135 0.3 96
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CESI.HHN. ML:1.6 0.0004615 0.36 AML other m 2021-09-18T02:33:17.58
IV.CESI.HHE. ML:1.3 0.0002585 0.28 AML other m 2021-09-18T02:33:17.60
IV.ASSB.HHN. ML:1.1 8.385E-5 0.26 AML other m 2021-09-18T02:33:20.23
IV.ASSB.HHE. ML:1 7.605E-5 1.04 AML other m 2021-09-18T02:33:20.36
IV.FDMO.HHN. ML:0.8 4.205E-5 0.54 AML other m 2021-09-18T02:33:20.93
IV.MML1.EHN. ML:0.7 3.31E-5 0.72 AML other m 2021-09-18T02:33:21.31
IV.NRCA.HHE. ML:1 6.155E-5 0.06 AML other m 2021-09-18T02:33:21.38
IV.FDMO.HHE. ML:0.8 4.6E-5 0.76 AML other m 2021-09-18T02:33:21.65
IV.NRCA.HHN. ML:1 6.855E-5 1.54 AML other m 2021-09-18T02:33:21.07
IV.MML1.EHE. ML:0.8 4.225E-5 1.5 AML other m 2021-09-18T02:33:22.02
IV.GAVE.EHN. ML:1.2 8.185E-5 0.4 AML other m 2021-09-18T02:33:22.37
IV.GAVE.EHE. ML:1.3 0.000106 1.06 AML other m 2021-09-18T02:33:22.46
IV.MURB.HHN. ML:1.2 4.79E-5 1.48 AML other m 2021-09-18T02:33:28.15
IV.ARVD.HHN. ML:0.9 1.675E-5 0.56 AML other m 2021-09-18T02:33:28.46
IV.MURB.HHE. ML:1.3 6.06E-5 0.22 AML other m 2021-09-18T02:33:28.85
IV.ARVD.HHE. ML:1 2.06E-5 0.5 AML other m 2021-09-18T02:33:36.38
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