Earthquake with magnitude of ML 0.8 on date 18-10-2021 and time 22:39:39 (Italy) in region 3 km E Sellano (PG)

A magnitude ML 0.8 earthquake occured in region: 3 km E Sellano (PG), on

  • 18-10-2021 20:39:39 (UTC)
  • 18-10-2021 22:39:39 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.886, 12.97 at 12 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 3 1079 1079
Preci PG 6 724 1803
Cerreto di Spoleto PG 8 1075 2878
Visso MC 11 1107 3985
Monte Cavallo MC 12 145 4130
Norcia PG 14 4957 9087
Castelsantangelo sul Nera MC 15 281 9368
Ussita MC 15 444 9812
Vallo di Nera PG 16 364 10176
Campello sul Clitunno PG 17 2442 12618
Trevi PG 18 8469 21087
Cascia PG 19 3217 24304
Pieve Torina MC 19 1458 25762
Poggiodomo PG 19 117 25879
Fiordimonte MC 20 202 26081
Sant'Anatolia di Narco PG 20 564 26645

Municipalities with at least 50000 inhabitants

An earthquake occurred to
23 Km E of Foligno (57155 inhabitants)
45 Km NE of Terni (111501 inhabitants)
53 Km E of Perugia (166134 inhabitants)
65 Km W of Teramo (54892 inhabitants)
69 Km NW of L'Aquila (69753 inhabitants)
88 Km NE of Viterbo (67173 inhabitants)
93 Km SW of Ancona (100861 inhabitants)
100 Km N of Guidonia Montecelio (88673 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 2021-10-18
20:39:39
42.8857 12.9695 12 2021-10-18
20:45:35
Sala Sismica INGV-Roma 96736171
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-18 20:39:39 ± 0.05
Latitude 42.8857 ± 0.0018
Longitude 12.9695 ± 0.0037
Depth (km) 12 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 96736171

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 248
Semi-minor axis of confidence ellipse (meter) 158
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 231
Circular confidence region, given by single value of horizontal uncertainty (meter) 250
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 109
Number of associated phases, regardless of their use for origin computation 20
Number of defining phases 18
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.1
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.27609
Number of stations at which the event was observed 11
Number of stations from which data was used for origin computation 9
Magnitude information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.2
Num. used stations 12
Type of magnitude ML
Reference to an origin 96736171
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-18 20:45:35
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.SACS.HHZ. 2021-10-18T20:40:07.32 3.0 undecidable manual S 0.25 0
IV.CSP1.EHZ. 2021-10-18T20:39:49.81 0.6 undecidable manual S 40 0.268 94 0.05 48
IV.ASSB.HHZ. 2021-10-18T20:39:49.90 0.3 undecidable manual S 305 0.2761 93 -0.09 71
IV.MML1.EHZ. 2021-10-18T20:39:48.64 0.6 undecidable manual S 0 0.2275 95 0.08 49
IV.GAVE.EHZ. 2021-10-18T20:39:47.78 0.6 undecidable manual S 196 0.2014 96 0 49
IV.MC2.EHZ. 2021-10-18T20:39:46.06 3.0 negative manual P 2.55 0
IV.FDMO.HHZ. 2021-10-18T20:39:46.82 0.6 undecidable manual S 30 0.1736 99 -0.15 48
IV.ASSB.HHZ. 2021-10-18T20:39:45.43 0.6 undecidable manual P 305 0.2761 93 -0.06 48
IV.NRCA.HHZ. 2021-10-18T20:39:45.13 0.6 undecidable manual S 116 0.1178 115 -0.26 48
IV.CESI.HHZ. 2021-10-18T20:39:45.65 0.6 undecidable manual S 338 0.1286 111 -0.02 49
IV.CSP1.EHZ. 2021-10-18T20:39:45.38 0.6 positive manual P 40 0.268 94 0.02 49
IT.MTCL.HGZ. 2021-10-18T20:39:44.92 0.6 undecidable manual S 11 0.1106 118 -0.26 47
IV.GAVE.EHZ. 2021-10-18T20:39:44.25 0.6 positive manual P 196 0.2014 96 0.04 49
IV.FEMA.HNZ. 2021-10-18T20:39:44.83 0.3 undecidable manual S 38 0.0962 124 0 75
IV.MML1.EHZ. 2021-10-18T20:39:44.63 1.0 positive manual P 0 0.2275 95 -0.03 24
IV.FDMO.HHZ. 2021-10-18T20:39:43.76 0.3 positive manual P 30 0.1736 99 0.01 75
IV.CESI.HHZ. 2021-10-18T20:39:43.11 0.1 positive manual P 338 0.1286 111 0.12 99
IV.NRCA.HHZ. 2021-10-18T20:39:42.81 0.3 positive manual P 116 0.1178 115 -0.02 75
IT.MTCL.HGZ. 2021-10-18T20:39:42.70 0.1 undecidable manual P 11 0.1106 118 -0.01 100
IV.FEMA.HNZ. 2021-10-18T20:39:42.73 0.1 undecidable manual P 38 0.0962 124 0.22 97
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:0.9 7.37E-5 0.58 AML other m 2021-10-18T20:39:45.47
IV.NRCA.HHE. ML:0.9 8.075E-5 0.18 AML other m 2021-10-18T20:39:45.43
IV.CESI.HHN. ML:1 9.4E-5 1.9 AML other m 2021-10-18T20:39:45.98
IV.CESI.HHE. ML:0.7 4.54E-5 1.12 AML other m 2021-10-18T20:39:46.79
IV.FDMO.HHE. ML:1 6.915E-5 1.84 AML other m 2021-10-18T20:39:46.00
IV.FDMO.HHN. ML:0.7 3.955E-5 0.16 AML other m 2021-10-18T20:39:47.10
IV.GAVE.EHE. ML:0.9 5.51E-5 1.66 AML other m 2021-10-18T20:39:48.85
IV.GAVE.EHN. ML:1.1 7.48E-5 0.16 AML other m 2021-10-18T20:39:48.25
IV.MML1.EHE. ML:0.7 2.78E-5 0.16 AML other m 2021-10-18T20:39:48.96
IV.MML1.EHN. ML:0.6 2.34E-5 1.84 AML other m 2021-10-18T20:39:49.03
IV.ASSB.HHE. ML:0.6 1.7794205E-5 0.1792 AML other m 2021-10-18T20:39:50.11
IV.ASSB.HHN. ML:0.5 1.38539495E-5 0.0512 AML other m 2021-10-18T20:39:50.16
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