Earthquake with magnitude of ML 0.8 on date 18-09-2021 and time 04:50:33 (Italy) in region 2 km SE Visso (MC)

A magnitude ML 0.8 earthquake occured in region: 2 km SE Visso (MC), on

  • 18-09-2021 02:50:33 (UTC)
  • 18-09-2021 04:50:33 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.922, 13.112 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
Visso MC 2 1107 1107
Ussita MC 3 444 1551
Castelsantangelo sul Nera MC 5 281 1832
Preci PG 8 724 2556
Monte Cavallo MC 12 145 2701
Bolognola MC 12 142 2843
Fiordimonte MC 13 202 3045
Acquacanina MC 13 121 3166
Fiastra MC 13 559 3725
Norcia PG 14 4957 8682
Pieve Torina MC 15 1458 10140
Sellano PG 15 1079 11219
Pievebovigliana MC 16 866 12085
Montemonaco AP 18 604 12689
Muccia MC 19 915 13604
Montefortino FM 19 1178 14782
Cerreto di Spoleto PG 20 1075 15857
Sarnano MC 20 3264 19121

Municipalities with at least 50000 inhabitants

An earthquake occurred to
33 Km E of Foligno (57155 inhabitants)
55 Km NE of Terni (111501 inhabitants)
57 Km NW of Teramo (54892 inhabitants)
62 Km E of Perugia (166134 inhabitants)
68 Km NW of L'Aquila (69753 inhabitants)
84 Km SW of Ancona (100861 inhabitants)
96 Km W of Montesilvano (53738 inhabitants)
100 Km NE of Viterbo (67173 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 0.8 2021-09-18
02:50:33
42.922 13.1123 10 2021-09-18
02:56:08
Sala Sismica INGV-Roma 95564671
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-18 02:50:33 ± 0.13
Latitude 42.9220 ± 0.0045
Longitude 13.1123 ± 0.0074
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 95564671

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 468
Semi-minor axis of confidence ellipse (meter) 464
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 61
Circular confidence region, given by single value of horizontal uncertainty (meter) 470
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 84
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) 0.27
Epicentral distance of station closest to the epicenter (degree) 0.05666
Epicentral distance of station farthest from the epicenter (degree) 0.27969
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitude information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.3
Num. used stations 4
Type of magnitude ML
Reference to an origin 95564671
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-18 02:56:08
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.GAVE.EHZ. 2021-09-18T02:50:44.86 0.1 undecidable manual S 215 0.2797 50 0.32 92
IV.CSP1.EHZ. 2021-09-18T02:50:41.03 0.1 undecidable manual S 22 0.1826 115 -0.16 97
IV.MMO1.EHZ. 2021-09-18T02:50:40.14 0.1 undecidable manual S 98 0.1583 118 -0.22 97
IV.CESI.HHZ. 2021-09-18T02:50:40.76 0.1 undecidable manual S 299 0.1727 116 -0.1 99
IV.FDMO.HHZ. 2021-09-18T02:50:39.18 0.1 undecidable manual S 351 0.116 126 0.21 97
IV.GAVE.EHZ. 2021-09-18T02:50:39.24 1.0 undecidable manual P 215 0.2797 50 -0.6 21
IV.CESI.HHZ. 2021-09-18T02:50:37.58 1.0 positive manual P 299 0.1727 116 -0.14 24
IV.CSP1.EHZ. 2021-09-18T02:50:37.75 0.6 negative manual P 22 0.1826 115 -0.16 49
IV.MC2.EHZ. 2021-09-18T02:50:37.96 0.1 undecidable manual S 101 0.0567 146 0.58 90
IV.MMO1.EHZ. 2021-09-18T02:50:37.21 0.6 negative manual P 98 0.1583 118 -0.22 48
IV.NRCA.HHZ. 2021-09-18T02:50:37.88 0.1 undecidable manual S 179 0.0881 134 -0.27 97
IV.NRCA.HHZ. 2021-09-18T02:50:36.04 0.1 positive manual P 179 0.0881 134 -0.12 100
IV.FDMO.HHZ. 2021-09-18T02:50:36.57 0.6 undecidable manual P 351 0.116 126 -0.05 50
IV.MC2.EHZ. 2021-09-18T02:50:35.89 0.1 negative manual P 101 0.0567 146 0.18 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:1.2 0.0001905 1.84 AML other m 2021-09-18T02:50:37.02
IV.NRCA.HHE. ML:0.9 0.00011325 1.2 AML other m 2021-09-18T02:50:38.02
IV.FDMO.HHN. ML:0.5 3.405E-5 0.48 AML other m 2021-09-18T02:50:39.41
IV.FDMO.HHE. ML:0.6 4.115E-5 0.76 AML other m 2021-09-18T02:50:39.40
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