Earthquake with magnitude of ML 1.8 on date 20-10-2021 and time 03:52:26 (Italy) in region 6 km W Montegallo (AP)

A magnitude ML 1.8 earthquake occured in region: 6 km W Montegallo (AP), on

  • 20-10-2021 01:52:26 (UTC)
  • 20-10-2021 03:52:26 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.847, 13.257 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
Montegallo AP 6 523 523
Montemonaco AP 8 604 1127
Arquata del Tronto AP 9 1178 2305
Castelsantangelo sul Nera MC 10 281 2586
Montefortino FM 13 1178 3764
Ussita MC 15 444 4208
Norcia PG 15 4957 9165
Acquasanta Terme AP 15 2916 12081
Bolognola MC 17 142 12223
Visso MC 17 1107 13330
Accumoli RI 17 667 13997
Amandola FM 17 3629 17626
Palmiano AP 18 196 17822
Comunanza AP 18 3166 20988
Roccafluvione AP 18 2010 22998
Preci PG 18 724 23722
Venarotta AP 20 2066 25788

Municipalities with at least 50000 inhabitants

An earthquake occurred to
42 Km NW 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)
76 Km E of Perugia (166134 inhabitants)
82 Km W of Montesilvano (53738 inhabitants)
88 Km S of Ancona (100861 inhabitants)
89 Km W of Pescara (121014 inhabitants)
93 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 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 1.8 2021-10-20
01:52:26
42.8472 13.257 11 2021-10-20
02:01:00
Sala Sismica INGV-Roma 96780511
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-20 01:52:26 ± 0.08
Latitude 42.8472 ± 0.0054
Longitude 13.2570 ± 0.0098
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 96780511

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 908
Semi-minor axis of confidence ellipse (meter) 444
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 306
Circular confidence region, given by single value of horizontal uncertainty (meter) 910
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 31
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.23
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.29138
Number of stations at which the event was observed 24
Number of stations from which data was used for origin computation 6
Magnitude information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.4
Num. used stations 48
Type of magnitude ML
Reference to an origin 96780511
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-20 02:01:00
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.PIEI.HHZ. 2021-10-20T01:52:54.65 3.0 undecidable manual S -3.26 0
IV.NARO.HHZ. 2021-10-20T01:52:45.13 3.0 undecidable manual P -0.49 0
IV.ATPI.EHZ. 2021-10-20T01:52:44.57 3.0 negative manual P -0.31 0
IV.PIEI.HHZ. 2021-10-20T01:52:44.44 3.0 undecidable manual P -0.4 0
IV.FRON.EHZ. 2021-10-20T01:52:42.90 3.0 negative manual P -0.23 0
IV.ATFO.HHZ. 2021-10-20T01:52:41.85 3.0 positive manual P -0.3 0
IV.MURB.HHZ. 2021-10-20T01:52:41.14 3.0 positive manual P -0.24 0
IV.MNTT.EHZ. 2021-10-20T01:52:41.82 3.0 undecidable manual S 0.59 0
IV.ARVD.HHZ. 2021-10-20T01:52:41.97 3.0 negative manual P 0.36 0
IV.SSFR.HHZ. 2021-10-20T01:52:41.38 3.0 undecidable manual P -0.06 0
IV.MOMA.HHZ. 2021-10-20T01:52:40.50 3.0 positive manual P 1.84 0
IV.CING.HHZ. 2021-10-20T01:52:40.34 3.0 undecidable manual P 1.57 0
IV.FOSV.EHZ. 2021-10-20T01:52:39.29 3.0 positive manual P -0.16 0
IV.EL6.EHZ. 2021-10-20T01:52:39.22 3.0 positive manual P 1.18 0
IV.ATCC.EHZ. 2021-10-20T01:52:39.14 3.0 positive manual P -0.13 0
IV.LNSS.HHZ. 2021-10-20T01:52:38.38 0.3 undecidable manual S 213 0.2914 50 0.52 65
IV.ASSB.HHZ. 2021-10-20T01:52:37.96 3.0 positive manual P 0.21 0
IV.SNTG.HHZ. 2021-10-20T01:52:37.83 3.0 negative manual P 0.48 0
IV.MF5.EHZ. 2021-10-20T01:52:35.53 0.3 undecidable manual S 46 0.2041 50 0.26 70
IV.GUMA.HHZ. 2021-10-20T01:52:35.86 0.3 undecidable manual S 15 0.223 50 0.04 73
IV.SMA1.EHZ. 2021-10-20T01:52:35.80 0.3 undecidable manual S 165 0.2239 50 -0.06 73
IV.CESI.HHZ. 2021-10-20T01:52:35.36 3.0 positive manual P 1.59 0
IV.TERO.HHZ. 2021-10-20T01:52:33.79 3.0 undecidable manual P -3.08 0
IV.NRCA.HHZ. 2021-10-20T01:52:32.30 0.3 undecidable manual S 263 0.1052 133 0.1 74
IV.LNSS.HHZ. 2021-10-20T01:52:32.83 0.1 undecidable manual P 213 0.2914 50 -0.31 91
IV.SMA1.EHZ. 2021-10-20T01:52:31.66 1.0 positive manual P 165 0.2239 50 -0.32 23
IV.MF5.EHZ. 2021-10-20T01:52:31.61 1.0 negative manual P 46 0.2041 50 -0.03 24
IV.MMO1.EHZ. 2021-10-20T01:52:31.52 0.3 undecidable manual S 44 0.0728 143 0.17 73
IV.GUMA.HHZ. 2021-10-20T01:52:31.62 0.3 positive manual P 15 0.223 50 -0.34 68
IV.MMO1.EHZ. 2021-10-20T01:52:29.34 0.1 undecidable manual P 44 0.0728 143 -0.04 100
IV.NRCA.HHZ. 2021-10-20T01:52:29.80 0.1 undecidable manual P 263 0.1052 133 -0.07 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:1.2 0.0001565 0.16 AML other m 2021-10-20T01:52:32.37
IV.NRCA.HHN. ML:1.2 0.000194 0.08 AML other m 2021-10-20T01:52:32.42
IV.FDMO.HHE. ML:2.3 0.001115 1.8 AML other m 2021-10-20T01:52:37.08
IV.FEMA.HNN. ML:2.3 0.001265 1.18 AML other m 2021-10-20T01:52:37.16
IV.FDMO.HHN. ML:2.2 0.0009765 0.12 AML other m 2021-10-20T01:52:37.35
IV.FEMA.HNE. ML:2.3 0.001345 0.4 AML other m 2021-10-20T01:52:37.19
IV.CESI.HHN. ML:2.8 0.00271 0.14 AML other m 2021-10-20T01:52:37.62
IV.CESI.HHE. ML:2.7 0.001965 0.14 AML other m 2021-10-20T01:52:37.55
IV.CESI.HNN. ML:2.8 0.002565 0.14 AML other m 2021-10-20T01:52:37.63
IV.CESI.HNE. ML:2.6 0.001665 0.14 AML other m 2021-10-20T01:52:37.56
IV.MML1.EHN. ML:2.2 0.000603 0.48 AML other m 2021-10-20T01:52:38.00
IV.MML1.HNN. ML:2.2 0.0005935 1.28 AML other m 2021-10-20T01:52:38.00
IV.MML1.EHE. ML:2.3 0.000701 0.98 AML other m 2021-10-20T01:52:38.22
IV.MML1.HNE. ML:2.2 0.00066 0.98 AML other m 2021-10-20T01:52:38.22
IV.CSP1.EHN. ML:2.4 0.001385 1.04 AML other m 2021-10-20T01:52:40.81
IV.CSP1.EHE. ML:2.5 0.00159 0.4 AML other m 2021-10-20T01:52:40.39
IV.SNTG.HHE. ML:1.8 0.0001615 0.14 AML other m 2021-10-20T01:52:42.15
IV.ASSB.HHN. ML:1.9 0.000175 0.2 AML other m 2021-10-20T01:52:42.49
IV.GUMA.HNN. ML:1.8 0.0004065 0.24 AML other m 2021-10-20T01:52:42.81
IV.SNTG.HHN. ML:1.8 0.000164 1.06 AML other m 2021-10-20T01:52:42.18
IV.GUMA.HNE. ML:1.6 0.0002625 1 AML other m 2021-10-20T01:52:42.27
IV.GUMA.HHE. ML:1.9 0.000521 0.22 AML other m 2021-10-20T01:52:42.78
IV.ASSB.HHE. ML:1.8 0.000135 0.46 AML other m 2021-10-20T01:52:42.55
IV.GUMA.HHN. ML:1.8 0.0003565 0.2 AML other m 2021-10-20T01:52:42.81
IV.ATCC.EHE. ML:1.6 7.015E-5 0.44 AML other m 2021-10-20T01:52:44.75
IV.FOSV.EHE. ML:1.6 6.755E-5 1.64 AML other m 2021-10-20T01:52:44.05
IV.EL6.EHE. ML:1.9 0.000182 0.12 AML other m 2021-10-20T01:52:45.04
IV.ATCC.EHN. ML:1.6 7.795E-5 0.12 AML other m 2021-10-20T01:52:45.28
IV.EL6.EHN. ML:2 0.000209 0.18 AML other m 2021-10-20T01:52:45.47
IV.FOSV.EHN. ML:1.6 7.35E-5 0.94 AML other m 2021-10-20T01:52:45.10
IV.CING.HHN. ML:1.4 5.06E-5 1.42 AML other m 2021-10-20T01:52:47.16
IV.CING.HHE. ML:1.6 8.11E-5 1.3 AML other m 2021-10-20T01:52:47.82
IV.LNSS.HHN. ML:1.2 6.52E-5 0.28 AML other m 2021-10-20T01:52:47.56
IV.LNSS.HHE. ML:1.3 7.795E-5 0.2 AML other m 2021-10-20T01:52:47.58
IV.MOMA.HHN. ML:1.4 6.1E-5 1.08 AML other m 2021-10-20T01:52:47.29
IV.MOMA.HHE. ML:1.6 0.00010085 0.22 AML other m 2021-10-20T01:52:47.92
IV.MURB.HHN. ML:1.7 7.155E-5 0.82 AML other m 2021-10-20T01:52:49.40
IV.SSFR.HHN. ML:1.8 9.025E-5 1.28 AML other m 2021-10-20T01:52:49.66
IV.MURB.HHE. ML:1.7 6.955E-5 0.24 AML other m 2021-10-20T01:52:49.84
IV.ARVD.HHE. ML:1.4 3.84E-5 0.18 AML other m 2021-10-20T01:52:50.37
IV.SSFR.HHE. ML:1.8 9.255E-5 0.18 AML other m 2021-10-20T01:52:50.88
IV.ARVD.HHN. ML:1.3 3.25E-5 0.48 AML other m 2021-10-20T01:52:51.25
IV.FRON.EHN. ML:1.5 4.025E-5 0.14 AML other m 2021-10-20T01:52:51.77
IV.MNTT.EHE. ML:1.6 0.00015 0.56 AML other m 2021-10-20T01:52:52.08
IV.FRON.EHE. ML:1.3 2.555E-5 1.18 AML other m 2021-10-20T01:52:52.85
IV.MNTT.EHN. ML:1.5 0.0001147 0.32 AML other m 2021-10-20T01:52:53.88
IV.PIEI.HHE. ML:1.3 1.915E-5 0.14 AML other m 2021-10-20T01:52:55.03
IV.PIEI.HHN. ML:1.2 1.529E-5 0.48 AML other m 2021-10-20T01:52:56.32
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