INGVCENTRO​NAZIONALE​TERREMOTI
Sala Sismica

Earthquake with magnitude of ML 1.1 on date 21-09-2018 and time 05:41:04 (Italy) in region 5 km W Nocera Umbra (PG)

A magnitude ML 1.1 earthquake occured in region: 5 km W Nocera Umbra (PG), on

  • 21-09-2018 03:41:04 (UTC)
  • 21-09-2018 05:41:04 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.12, 12.73 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
Nocera Umbra PG 5 5839 5839
Valtopina PG 7 1398 7237
Assisi PG 11 28299 35536
Valfabbrica PG 11 3389 38925
Gualdo Tadino PG 13 15208 54133
Spello PG 15 8645 62778
Bastia Umbra PG 16 21874 84652
Fiuminata MC 18 1402 86054
Sefro MC 18 422 86476
Serravalle di Chienti MC 19 1070 87546
Cannara PG 19 4305 91851
Foligno PG 19 57155 149006
Fossato di Vico PG 19 2840 151846

Municipalities with at least 50000 inhabitants

An earthquake occurred to
19 Km N of Foligno (57155 inhabitants)
28 Km E of Perugia (166134 inhabitants)
63 Km N of Terni (111501 inhabitants)
79 Km E of Arezzo (99543 inhabitants)
83 Km S of Fano (60888 inhabitants)
84 Km SW of Ancona (100861 inhabitants)
89 Km S of Pesaro (94582 inhabitants)
94 Km NE of Viterbo (67173 inhabitants)
95 Km NW of Teramo (54892 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
Rev 100 ML 1.1 2018-09-21
03:41:04
43.12 12.73 10 2018-09-21
03:45:10
Sala Sismica INGV-Roma 61166521
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2018-09-21 03:41:04 ± 0.04
Latitude 43.12 ± 0.00
Longitude 12.73 ± 0.00
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 61166521

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 201
Semi-minor axis of confidence ellipse (meter) 178
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 28
Circular confidence region, given by single value of horizontal uncertainty (meter) 200
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 98
Number of associated phases, regardless of their use for origin computation 15
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.11
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.27249
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 6
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 61166521
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2018-09-21 03:45:10
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.PIEI.HHZ. 2018-09-21T03:41:20.44 3.0 undecidable manual S -0.11 0
IV.ATPI.EHZ. 2018-09-21T03:41:19.68 3.0 undecidable manual S 0.18 0
IV.FDMO.HHZ. 2018-09-21T03:41:15.36 0.1 undecidable manual S 109 0.2725 50 0.05 96
IV.MURB.HHZ. 2018-09-21T03:41:13.40 0.1 undecidable manual S 312 0.2068 114 0.15 95
IV.CESI.HHZ. 2018-09-21T03:41:12.12 0.1 undecidable manual S 134 0.1718 118 0.06 98
IV.NRCA.HHZ. 2018-09-21T03:41:12.93 3.0 negative manual P -0.06 0
IV.MML1.HNZ. 2018-09-21T03:41:12.09 0.1 undecidable manual S 93 0.1736 118 -0.02 98
IV.FOSV.EHZ. 2018-09-21T03:41:11.92 0.1 undecidable manual S 7 0.1718 118 -0.13 96
IV.FDMO.HHZ. 2018-09-21T03:41:10.63 0.1 undecidable manual P 109 0.2725 50 -0.14 94
IV.MML1.HNZ. 2018-09-21T03:41:09.04 0.1 undecidable manual P 93 0.1736 118 0.12 96
IV.ASSB.HHZ. 2018-09-21T03:41:09.57 0.3 undecidable manual S 214 0.098 133 -0.15 73
IV.MURB.HHZ. 2018-09-21T03:41:09.58 0.1 undecidable manual P 312 0.2068 114 0 98
IV.FOSV.EHZ. 2018-09-21T03:41:08.87 0.1 undecidable manual P 7 0.1718 118 -0.01 99
IV.CESI.HHZ. 2018-09-21T03:41:08.94 0.6 negative manual P 134 0.1718 118 0.05 49
IV.ASSB.HHZ. 2018-09-21T03:41:07.55 0.1 positive manual P 214 0.098 133 0.01 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ASSB.HHN. ML:1.3 0.000222 0.26 AML other m 2018-09-21T03:41:09.76
IV.ASSB.HHE. ML:1.1 0.000156 0.42 AML other m 2018-09-21T03:41:09.69
IV.FOSV.EHE. ML:1.3 0.0001465 0.26 AML other m 2018-09-21T03:41:12.03
IV.FOSV.EHN. ML:1.2 0.0001125 0.14 AML other m 2018-09-21T03:41:12.19
IV.CESI.HHE. ML:0.8 4.885E-5 0.18 AML other m 2018-09-21T03:41:12.53
IV.CESI.HHN. ML:0.8 5.065E-5 0.96 AML other m 2018-09-21T03:41:12.83
IV.MURB.HHE. ML:1.4 0.0001515 1.48 AML other m 2018-09-21T03:41:13.84
IV.MURB.HHN. ML:1.2 9.485E-5 0.62 AML other m 2018-09-21T03:41:14.66
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