Earthquake with magnitude of ML 0.9 on date 18-10-2021 and time 23:11:23 (Italy) in region 3 km E Sellano (PG)

A magnitude ML 0.9 earthquake occured in region: 3 km E Sellano (PG), on

  • 18-10-2021 21:11:23 (UTC)
  • 18-10-2021 23:11:23 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.884, 12.97 at 11 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 4 1079 1079
Preci PG 6 724 1803
Cerreto di Spoleto PG 8 1075 2878
Visso MC 11 1107 3985
Monte Cavallo MC 13 145 4130
Norcia PG 14 4957 9087
Castelsantangelo sul Nera MC 15 281 9368
Vallo di Nera PG 15 364 9732
Ussita MC 15 444 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)
44 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 earthquake resentment in the area, expressed in terms of intensity on the MCS scale (Mercalli-Cancani-Sieberg). Intensities are determined using data from questionnaires collected on the website http://www.hsit.it. The intensities shown are determined considering all the reports received from each municipality, and are all the more reliable the greater the number of questionnaires. The collected data are subjected to an automatic statistical filter, but are not checked individually. In particular, intensities greater than or equal to the VI degree of the MCS or EMS scale require on-site verification by specialized personnel. The black star is the epicenter of the earthquake that occurred. This map is updated every time citizens fill out new questionnaires. The number of questionnaires processed to obtain this map, the date and time of the last update are shown at the top right.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
ML 0.9 2021-10-18
21:11:23
42.8838 12.9697 11 2021-10-18
21:17:09
Sala Sismica INGV-Roma 96736641
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-18 21:11:23 ± 0.05
Latitude 42.8838 ± 0.0018
Longitude 12.9697 ± 0.0049
Depth (km) 11 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 96736641

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 379
Semi-minor axis of confidence ellipse (meter) 127
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 265
Circular confidence region, given by single value of horizontal uncertainty (meter) 380
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 143
Number of associated phases, regardless of their use for origin computation 17
Number of defining phases 15
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.14
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.28598
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 8
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.1
Num. used stations 10
Type of magnitude ML
Reference to an origin 96736641
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-18 21:17:09
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.SACS.HHZ. 2021-10-18T21:11:52.64 3.0 undecidable manual S 0.89 0
IV.SACS.HHZ. 2021-10-18T21:11:39.79 3.0 undecidable manual P 0.33 0
IV.LNSS.HHZ. 2021-10-18T21:11:34.61 0.6 undecidable manual S 170 0.286 50 0.08 48
IV.MMO1.EHZ. 2021-10-18T21:11:33.90 0.3 undecidable manual S 86 0.2617 50 0.06 73
IV.MML1.EHZ. 2021-10-18T21:11:32.81 0.1 undecidable manual S 0 0.2293 50 -0.06 98
IV.GAVE.EHZ. 2021-10-18T21:11:31.95 0.3 undecidable manual S 196 0.1996 50 -0.03 75
IV.FDMO.HHZ. 2021-10-18T21:11:31.09 0.3 undecidable manual S 29 0.1754 50 -0.17 73
IV.NRCA.HHZ. 2021-10-18T21:11:29.35 0.3 undecidable manual S 115 0.1169 130 -0.18 73
IV.CESI.HHZ. 2021-10-18T21:11:29.91 0.3 undecidable manual S 339 0.1304 127 -0.01 76
IV.MMO1.EHZ. 2021-10-18T21:11:29.63 0.1 undecidable manual P 86 0.2617 50 0.12 97
IV.LNSS.HHZ. 2021-10-18T21:11:29.78 0.1 undecidable manual P 170 0.286 50 -0.14 96
IV.MML1.EHZ. 2021-10-18T21:11:28.96 1.0 undecidable manual P 0 0.2293 50 0 25
IV.GAVE.EHZ. 2021-10-18T21:11:28.44 0.1 undecidable manual P 196 0.1996 50 0 100
IV.MC2.EHZ. 2021-10-18T21:11:28.54 1.0 negative manual P 80 0.1628 50 0.72 21
IV.FDMO.HHZ. 2021-10-18T21:11:27.98 0.1 undecidable manual P 29 0.1754 50 -0.05 100
IV.NRCA.HHZ. 2021-10-18T21:11:27.07 0.3 positive manual P 115 0.1169 130 0.04 76
IV.CESI.HHZ. 2021-10-18T21:11:27.37 0.1 positive manual P 339 0.1304 127 0.12 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:1 9.95E-5 0.56 AML other m 2021-10-18T21:11:29.71
IV.NRCA.HHE. ML:1 9.32E-5 0.16 AML other m 2021-10-18T21:11:29.75
IV.CESI.HHE. ML:0.7 4.675E-5 1.8 AML other m 2021-10-18T21:11:29.94
IV.CESI.HHN. ML:1 0.0001016 1.68 AML other m 2021-10-18T21:11:30.11
IV.FDMO.HHE. ML:1.1 8.57E-5 0.14 AML other m 2021-10-18T21:11:31.24
IV.FDMO.HHN. ML:0.8 4.94E-5 0.14 AML other m 2021-10-18T21:11:31.35
IV.GAVE.EHE. ML:0.8 4.395E-5 0.28 AML other m 2021-10-18T21:11:32.41
IV.GAVE.EHN. ML:1 6.335E-5 0.16 AML other m 2021-10-18T21:11:32.58
IV.MML1.EHE. ML:0.8 3.935E-5 0.18 AML other m 2021-10-18T21:11:33.12
IV.MML1.EHN. ML:0.7 2.9E-5 0.16 AML other m 2021-10-18T21:11:33.28
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