Earthquake with magnitude of ML 1.3 on date 20-10-2021 and time 05:09:41 (UTC) in region 6 km W Montegallo (AP)

A magnitude ML 1.3 earthquake occured in region: 6 km W Montegallo (AP), on

  • 20-10-2021 05:09:41 (UTC)
  • 20-10-2021 07:09:41 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.844, 13.258 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
Montegallo AP 6 523 523
Arquata del Tronto AP 8 1178 1701
Montemonaco AP 9 604 2305
Castelsantangelo sul Nera MC 10 281 2586
Montefortino FM 13 1178 3764
Norcia PG 15 4957 8721
Acquasanta Terme AP 15 2916 11637
Ussita MC 15 444 12081
Accumoli RI 17 667 12748
Visso MC 17 1107 13855
Bolognola MC 17 142 13997
Amandola FM 17 3629 17626
Palmiano AP 18 196 17822
Roccafluvione AP 18 2010 19832
Comunanza AP 18 3166 22998
Preci PG 18 724 23722
Venarotta AP 20 2066 25788

Municipalities with at least 50000 inhabitants

An earthquake occurred to
42 Km W of Teramo (54892 inhabitants)
47 Km E of Foligno (57155 inhabitants)
56 Km N of L'Aquila (69753 inhabitants)
59 Km NE of Terni (111501 inhabitants)
77 Km E of Perugia (166134 inhabitants)
82 Km W of Montesilvano (53738 inhabitants)
89 Km S of Ancona (100861 inhabitants)
89 Km W of Pescara (121014 inhabitants)
92 Km NW of Chieti (51815 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 1.3 2021-10-20
05:09:41
42.8437 13.2585 11 2021-10-20
05:18:46
Sala Sismica INGV-Roma 96786411
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-20 05:09:41 ± 0.08
Latitude 42.8437 ± 0.0072
Longitude 13.2585 ± 0.0086
Depth (km) 11 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 96786411

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 918
Semi-minor axis of confidence ellipse (meter) 458
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 320
Circular confidence region, given by single value of horizontal uncertainty (meter) 920
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 119
Number of associated phases, regardless of their use for origin computation 34
Number of defining phases 12
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
Epicentral distance of station farthest from the epicenter (degree) 0.28868
Number of stations at which the event was observed 27
Number of stations from which data was used for origin computation 6
Magnitude information

ML:1.3

Field Value
Value 1.3
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 96786411
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-20 05:18:46
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.GIZZ.HHZ. 2021-10-20T05:11:20.21 3.0 undecidable manual Sn -9.99 0
IV.SCHR.EHZ. 2021-10-20T05:11:06.74 3.0 undecidable manual Sg 2.03 0
IV.NOCI.HHZ. 2021-10-20T05:11:01.22 3.0 undecidable manual Sg -5.16 0
IV.IMTC.HHZ. 2021-10-20T05:10:45.72 3.0 undecidable manual Sg 7.07 0
IV.CADC.EHZ. 2021-10-20T05:10:37.58 3.0 undecidable manual Pg 3.12 0
IV.SENA.HHZ. 2021-10-20T05:10:34.68 3.0 undecidable manual Pn -3.05 0
IV.BRSN.EHZ. 2021-10-20T05:10:31.80 3.0 undecidable manual Sg -3.43 0
IV.GRIS.EHZ. 2021-10-20T05:10:29.48 3.0 undecidable manual Pg -1.06 0
IV.SBPO.HNZ. 2021-10-20T05:10:27.95 3.0 negative manual Pg 2.81 0
IV.SGG.HHZ. 2021-10-20T05:10:27.30 3.0 undecidable manual Sg 2.93 0
IV.CPGN.EHZ. 2021-10-20T05:10:25.84 3.0 undecidable manual Sg 2.22 0
IV.SGO.HHZ. 2021-10-20T05:10:16.75 3.0 positive manual Pg -1.16 0
IV.PZUN.HHZ. 2021-10-20T05:10:16.48 3.0 positive manual Pg -3.18 0
IV.NOCI.HHZ. 2021-10-20T05:10:12.78 3.0 negative manual Pn -9.99 0
IV.SRES.HHZ. 2021-10-20T05:10:11.92 3.0 undecidable manual Sn -1.97 0
IX.RSF3.HHZ.02 2021-10-20T05:09:59.98 3.0 undecidable manual Pn -9.99 0
IV.LNSS.HHZ. 2021-10-20T05:09:52.93 0.3 undecidable manual S 214 0.2887 50 0.23 69
IT.FOPC.HGZ. 2021-10-20T05:09:51.73 3.0 positive manual Pg -0.93 0
IV.MF5.EHZ. 2021-10-20T05:09:50.32 0.3 undecidable manual S 46 0.2059 50 0.08 73
IV.SMA1.EHZ. 2021-10-20T05:09:50.97 0.3 undecidable manual S 165 0.2203 50 0.31 69
IV.LNSS.HHZ. 2021-10-20T05:09:47.60 0.6 negative manual P 214 0.2887 50 -0.38 45
IV.NRCA.HHZ. 2021-10-20T05:09:47.02 0.3 undecidable manual S 265 0.1061 132 0.02 75
IV.GUMA.HHZ. 2021-10-20T05:09:46.38 3.0 positive manual Pg 0.6 0
IV.SMA1.EHZ. 2021-10-20T05:09:46.43 0.6 positive manual P 165 0.2203 50 -0.38 46
IV.MMO1.EHZ. 2021-10-20T05:09:46.31 0.1 undecidable manual S 42 0.0746 142 0.14 98
IV.MC2.EHZ. 2021-10-20T05:09:46.70 0.3 undecidable manual S 323 0.0845 138 0.29 71
IV.CSP1.EHZ. 2021-10-20T05:09:46.43 3.0 positive manual Pg -1.03 0
IV.MF5.EHZ. 2021-10-20T05:09:46.37 0.6 negative manual P 46 0.2059 50 -0.19 47
IV.MML1.EHZ. 2021-10-20T05:09:45.75 3.0 positive manual P -4.53 0
IV.RM33.EHZ. 2021-10-20T05:09:45.50 3.0 undecidable manual Pn 0
IV.MC2.EHZ. 2021-10-20T05:09:44.30 0.1 undecidable manual P 323 0.0845 138 -0.05 100
IV.NRCA.HHZ. 2021-10-20T05:09:44.54 0.1 negative manual P 265 0.1061 132 -0.15 98
IV.MMO1.EHZ. 2021-10-20T05:09:44.03 0.1 undecidable manual P 42 0.0746 142 -0.18 98
IV.FDMO.HHZ. 2021-10-20T05:09:43.46 3.0 positive manual P -4.75 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:1.4 0.0002985 0.08 AML other m 2021-10-20T05:09:47.16
IV.NRCA.HHE. ML:1.3 0.0002345 1.24 AML other m 2021-10-20T05:09:47.11
IV.FDMO.HHN. ML:1.1 7.385E-5 1.78 AML other m 2021-10-20T05:09:50.95
IV.FDMO.HHE. ML:0.8 4.055E-5 1.78 AML other m 2021-10-20T05:09:50.98
IV.GUMA.HHE. ML:1.1 7.37E-5 0.2 AML other m 2021-10-20T05:09:50.72
IV.GUMA.HHN. ML:1.1 6.925E-5 0.5 AML other m 2021-10-20T05:09:53.23
IV.SRES.HHN. ML:1.9 0.00010085 1.6 AML other m 2021-10-20T05:10:03.08
IV.SRES.HHE. ML:1.9 9.105E-5 0.38 AML other m 2021-10-20T05:10:04.60
IV.CPGN.HNN. ML:3.2 0.0009605 0.42 AML other m 2021-10-20T05:10:06.59
IV.CPGN.HNE. ML:3 0.000625 0.4 AML other m 2021-10-20T05:10:06.78
IV.PZUN.HHN. ML:3.5 0.0003345 0.06 AML other m 2021-10-20T05:10:33.47
IV.PZUN.HHE. ML:3.3 0.000206 0.32 AML other m 2021-10-20T05:10:34.57
IV.SCHR.EHN. ML:2.7 3.66E-5 0.08 AML other m 2021-10-20T05:11:27.00
IV.SCHR.EHE. ML:2.7 3.46E-5 0.06 AML other m 2021-10-20T05:11:31.52
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