Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 26-10-2020 and time 21:22:28 (Italy) in region 3 km E Roccafluvione (AP)

A magnitude ML 1.1 earthquake occured in region: 3 km E Roccafluvione (AP), on

  • 26-10-2020 20:22:28 (UTC)
  • 26-10-2020 21:22:28 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.8580, 13.5080 at 19 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Roccafluvione AP 3 2010 2010
Venarotta AP 3 2066 4076
Ascoli Piceno AP 6 49407 53483
Palmiano AP 6 196 53679
Folignano AP 11 9241 62920
Rotella AP 12 906 63826
Force AP 12 1354 65180
Acquasanta Terme AP 13 2916 68096
Castignano AP 13 2796 70892
Valle Castellana TE 14 977 71869
Comunanza AP 14 3166 75035
Appignano del Tronto AP 14 1785 76820
Montegallo AP 14 523 77343
Montedinove AP 14 488 77831
Maltignano AP 15 2401 80232
Montefalcone Appennino FM 15 424 80656
Montemonaco AP 15 604 81260
Civitella del Tronto TE 16 5116 86376
Montefortino FM 17 1178 87554
Montalto delle Marche AP 17 2122 89676
Castel di Lama AP 17 8634 98310
Smerillo FM 17 365 98675
Offida AP 17 5058 103733
Sant'Egidio alla Vibrata TE 17 9811 113544
Montelparo FM 18 778 114322
Santa Vittoria in Matenano FM 18 1330 115652
Amandola FM 19 3629 119281
Castorano AP 19 2380 121661
Rocca Santa Maria TE 19 537 122198
Ancarano TE 19 1857 124055
Arquata del Tronto AP 20 1178 125233
Colli del Tronto AP 20 3668 128901
Monte Rinaldo FM 20 379 129280

Municipalities with at least 50000 inhabitants

An earthquake occurred to
27 Km NW of Teramo (54892 inhabitants)
57 Km N of L'Aquila (69753 inhabitants)
65 Km NW of Montesilvano (53738 inhabitants)
66 Km E of Foligno (57155 inhabitants)
72 Km NW of Pescara (121014 inhabitants)
78 Km E of Terni (111501 inhabitants)
78 Km NW of Chieti (51815 inhabitants)
85 Km S of Ancona (100861 inhabitants)
95 Km E of Perugia (166134 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000 		ML 1.1 2020-10-26
20:22:28		 42.8577 13.5077 19 2021-02-26
14:56:19		 Bollettino Sismico Italiano INGV 87181531
Reviewed
Rev100 		ML 1.2 2020-10-26
20:22:28		 42.8587 13.5125 20 2020-10-26
20:27:34		 Sala Sismica INGV-Roma 84162641
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-10-26 20:22:28 ± 0.12
Latitude 42.8577 ± 0.0027
Longitude 13.5077 ± 0.0074
Depth (km) 19 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 87181531

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 500
Semi-minor axis of confidence ellipse (meter) 322
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 103
Circular confidence region, given by single value of horizontal uncertainty (meter) 500.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 104
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 15
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.15
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.41009
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 9
Magnitudes information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 7
Type of magnitude ML
Reference to an origin 87181531
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-02-15 13:18:20

ML:1.2

Field Value
Value 1.2
Uncertainty 0.2
Num. used stations 7
Type of magnitude ML
Reference to an origin 84162641
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-10-26 20:27:34
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ARVD.HHZ. 2020-10-26T20:22:44.42 3.0 negative manual P 0.19 0
IV.SMA1.EHZ. 2020-10-26T20:22:39.47 0.3 undecidable manual S 209 28.8489 114 0.25 70
IV.TERO.HHZ. 2020-10-26T20:22:38.74 0.3 undecidable manual S 163 27.2505 116 -0.08 73
IV.MNTT.EHZ. 2020-10-26T20:22:37.90 0.3 undecidable manual S 17 23.754 120 -0.11 72
IV.MTRA.HNZ. 2020-10-26T20:22:36.12 0.6 undecidable manual S 219 14.3745 137 0.08 50
IV.MF5.EHZ. 2020-10-26T20:22:36.16 0.3 undecidable manual S 345 14.9739 136 0.01 75
IV.MMO1.EHZ. 2020-10-26T20:22:36.23 0.1 undecidable manual S 288 15.3735 135 0 99
IV.RM33.EHZ. 2020-10-26T20:22:36.59 0.6 undecidable manual P 212 45.5211 104 -0.56 42
IV.NRCA.HHZ. 2020-10-26T20:22:35.25 0.3 undecidable manual P 265 32.1456 111 0.07 72
IV.SMA1.EHZ. 2020-10-26T20:22:34.73 0.1 undecidable manual P 209 28.8489 114 0.01 97
IV.MNTT.EHZ. 2020-10-26T20:22:34.22 0.3 undecidable manual P 17 23.754 120 0.2 71
IV.TERO.HHZ. 2020-10-26T20:22:34.39 0.3 undecidable manual P 163 27.2505 116 -0.1 73
IV.OFFI.HHZ. 2020-10-26T20:22:33.30 0.3 undecidable manual P 59 16.7721 132 0.15 72
IV.MF5.EHZ. 2020-10-26T20:22:32.91 0.3 undecidable manual P 345 14.9739 136 -0.04 75
IV.MMO1.EHZ. 2020-10-26T20:22:32.93 0.3 undecidable manual P 288 15.3735 135 -0.06 74
IV.MTRA.HNZ. 2020-10-26T20:22:32.90 0.1 undecidable manual P 219 14.3745 137 0.01 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.TERO.HNE. ML:1.3 0.000097981785 0.0768 AML other m 2020-10-26T20:22:38.92
IV.TERO.HHN. ML:1.0 0.000045576925 0.064 AML other m 2020-10-26T20:22:39.01
IV.TERO.HHE. ML:1.2 0.00008220051 0.064 AML other m 2020-10-26T20:22:39.01
IV.SMA1.EHN. ML:0.9 0.000035650149999999996 0.1152 AML other m 2020-10-26T20:22:39.78
IV.NRCA.HHN. ML:1.3 0.000073081035 1.9104 AML other m 2020-10-26T20:22:41.97
IV.NRCA.HHE. ML:1.3 0.00008464373 0.0896 AML other m 2020-10-26T20:22:41.17
IV.SMA1.EHE. ML:0.8 0.000030236085000000002 0.2944 AML other m 2020-10-26T20:22:41.52
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