Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.8 on date 23-01-2021 and time 11:29:43 (Italy) in region 5 km SW Roccafluvione (AP)

A magnitude ML 1.8 earthquake occured in region: 5 km SW Roccafluvione (AP), on

  • 23-01-2021 10:29:43 (UTC)
  • 23-01-2021 11:29:43 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.8310, 13.4280 at 21 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 5 2010 2010
Acquasanta Terme AP 7 2916 4926
Montegallo AP 8 523 5449
Venarotta AP 8 2066 7515
Palmiano AP 8 196 7711
Montemonaco AP 11 604 8315
Valle Castellana TE 12 977 9292
Arquata del Tronto AP 12 1178 10470
Ascoli Piceno AP 13 49407 59877
Comunanza AP 14 3166 63043
Montefortino FM 14 1178 64221
Force AP 16 1354 65575
Folignano AP 17 9241 74816
Rotella AP 18 906 75722
Montefalcone Appennino FM 18 424 76146
Amandola FM 18 3629 79775
Rocca Santa Maria TE 18 537 80312
Smerillo FM 19 365 80677
Castignano AP 20 2796 83473

Municipalities with at least 50000 inhabitants

An earthquake occurred to
30 Km NW of Teramo (54892 inhabitants)
53 Km N of L'Aquila (69753 inhabitants)
61 Km E of Foligno (57155 inhabitants)
69 Km NW of Montesilvano (53738 inhabitants)
70 Km E of Terni (111501 inhabitants)
76 Km NW of Pescara (121014 inhabitants)
81 Km NW of Chieti (51815 inhabitants)
88 Km S of Ancona (100861 inhabitants)
90 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 1.8 2021-01-23
10:29:43		 42.8313 13.4277 21 2021-07-12
16:54:56		 Bollettino Sismico Italiano INGV 86784981
Reviewed
Rev100 		ML 1.8 2021-01-23
10:29:42		 42.8328 13.4093 24 2021-01-23
10:40:53		 Sala Sismica INGV-Roma 86489531
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-23 10:29:43 ± 0.11
Latitude 42.8313 ± 0.0036
Longitude 13.4277 ± 0.0074
Depth (km) 21 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 86784981

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 618
Semi-minor axis of confidence ellipse (meter) 76
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 66
Circular confidence region, given by single value of horizontal uncertainty (meter) 620.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 139
Number of associated phases, regardless of their use for origin computation 49
Number of defining phases 30
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.41998
Number of stations at which the event was observed 33
Number of stations from which data was used for origin computation 15
Magnitudes information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.1
Num. used stations 12
Type of magnitude ML
Reference to an origin 86784981
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-03-05 15:46:53

ML:1.8

Field Value
Value 1.8
Uncertainty 0.1
Num. used stations 12
Type of magnitude ML
Reference to an origin 86489531
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-01-23 10:40:53
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ERC.EHZ. 2021-01-23T10:31:17.57 3.0 undecidable manual Sn -5.96 0
IV.CELB.HHZ. 2021-01-23T10:31:04.98 3.0 undecidable manual Sg 15.82 0
IV.CET2.HHZ. 2021-01-23T10:30:47.62 3.0 undecidable manual Sn -3.92 0
IV.TDS.HHZ. 2021-01-23T10:30:47.34 3.0 undecidable manual Sn -4.58 0
IV.AGLI.HHZ. 2021-01-23T10:30:42.46 3.0 positive manual Pg 18.73 0
IV.CPGN.EHZ. 2021-01-23T10:30:40.24 3.0 undecidable manual Sg 12.3 0
IV.TRIF.CHZ. 2021-01-23T10:30:39.68 3.0 undecidable manual Sn -0.01 0
GU.GRAM.HHZ. 2021-01-23T10:30:39.70 3.0 positive manual Pg 19.58 0
IV.SERS.HHZ. 2021-01-23T10:30:36.08 3.0 undecidable manual Pg 14.76 0
IV.BRSN.EHZ. 2021-01-23T10:30:36.00 3.0 undecidable manual Sn -1.78 0
IV.PCN.EHZ. 2021-01-23T10:30:33.09 3.0 undecidable manual Pn 6.28 0
IV.GIZZ.HHZ. 2021-01-23T10:30:29.11 3.0 negative manual Pg 9.25 0
IV.TRIF.CHZ. 2021-01-23T10:30:20.96 3.0 undecidable manual Pg 15.18 0
IV.IST3.HNZ. 2021-01-23T10:30:17.28 3.0 undecidable manual Pn -1.85 0
IV.T0110.HHZ. 2021-01-23T10:30:04.30 3.0 undecidable manual Sg 0.75 0
IV.RIBO.EHZ.01 2021-01-23T10:30:04.69 3.0 undecidable manual Pn 0.64 0
IT.OPI.HGZ. 2021-01-23T10:30:03.48 3.0 undecidable manual Sn -2.48 0
IV.CESI.HHZ. 2021-01-23T10:29:58.92 0.6 undecidable manual S 295 46.62 107 0.45 43
IV.GIGS.HHE. 2021-01-23T10:29:57.86 0.3 undecidable manual S 164 43.623 108 0.17 69
IV.RM33.EHZ. 2021-01-23T10:29:57.12 0.6 undecidable manual S 206 39.7269 110 0.4 44
IV.MURB.HHZ. 2021-01-23T10:29:56.68 3.0 undecidable manual Pn 2.47 0
IV.FDMO.HHZ. 2021-01-23T10:29:55.60 0.6 undecidable manual S 310 35.8419 113 -0.14 47
IV.CAMP.HHE. 2021-01-23T10:29:55.30 0.3 undecidable manual S 183 32.8449 115 0.28 69
IV.CSP1.EHZ. 2021-01-23T10:29:55.33 0.6 undecidable manual S 328 34.1436 114 0 48
IV.GUMA.HHE. 2021-01-23T10:29:54.00 0.6 undecidable manual S 344 26.751 121 0.42 45
IV.SAP2.EHZ. 2021-01-23T10:29:54.81 0.6 undecidable manual S 356 29.5482 118 0.58 42
IV.TERO.HHE. 2021-01-23T10:29:53.63 0.6 undecidable manual S 148 27.2505 121 -0.07 48
IV.NRCA.HHZ. 2021-01-23T10:29:53.07 0.6 undecidable manual S 271 25.4523 123 -0.23 47
IV.T1299.HNE. 2021-01-23T10:29:53.74 0.6 undecidable manual S 208 24.8529 123 0.58 43
IV.MF5.EHZ. 2021-01-23T10:29:52.02 0.6 undecidable manual S 9 17.5713 135 0.38 46
IV.SMA1.EHZ. 2021-01-23T10:29:52.97 0.3 undecidable manual S 199 23.4543 125 0.11 73
IV.GIGS.HHE. 2021-01-23T10:29:51.21 0.3 undecidable manual P 164 43.623 108 -0.34 67
IV.CESI.HHZ. 2021-01-23T10:29:51.72 0.6 undecidable manual P 295 46.62 107 -0.28 45
IV.RM33.EHZ. 2021-01-23T10:29:50.86 0.3 undecidable manual P 206 39.7269 110 -0.13 70
IV.FDMO.HHZ. 2021-01-23T10:29:50.09 0.3 undecidable manual P 310 35.8419 113 -0.34 68
IV.MTRA.HNZ. 2021-01-23T10:29:50.17 0.3 undecidable manual S 197 8.6802 155 -0.09 74
IV.MMO1.EHZ. 2021-01-23T10:29:50.35 0.6 undecidable manual S 313 11.1777 149 -0.23 48
IV.CAMP.HHE. 2021-01-23T10:29:49.86 0.3 undecidable manual P 183 32.8449 115 -0.14 71
IV.T1299.HNE. 2021-01-23T10:29:49.02 0.3 undecidable manual P 208 24.8529 123 0.09 73
IV.CSP1.EHZ. 2021-01-23T10:29:49.94 0.3 undecidable manual P 328 34.1436 114 -0.24 70
IV.GUMA.HHE. 2021-01-23T10:29:49.12 0.3 undecidable manual P 344 26.751 121 -0.06 73
IV.TERO.HHE. 2021-01-23T10:29:49.20 0.3 undecidable manual P 148 27.2505 121 -0.04 73
IV.SAP2.EHZ. 2021-01-23T10:29:49.73 0.3 undecidable manual P 356 29.5482 118 0.18 70
IV.NRCA.HHZ. 2021-01-23T10:29:48.79 0.1 undecidable manual P 271 25.4523 123 -0.22 94
IV.MF5.EHZ. 2021-01-23T10:29:48.09 0.3 undecidable manual P 9 17.5713 135 0.03 74
IV.SMA1.EHZ. 2021-01-23T10:29:48.72 0.1 undecidable manual P 199 23.4543 125 -0.04 98
IV.MTRA.HNZ. 2021-01-23T10:29:47.20 0.1 undecidable manual P 197 8.6802 155 -0.06 100
IV.MMO1.EHZ. 2021-01-23T10:29:47.29 0.1 undecidable manual P 313 11.1777 149 -0.15 98
IV.MIDA.HHZ. 2021-01-23T10:29:46.94 3.0 negative manual P -0.24 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MTRA.EHN. ML:1.9 0.0005655 0.16 AML other m 2021-01-23T10:29:50.33
IV.MTRA.HNN. ML:1.9 0.0005729999999999999 0.16 AML other m 2021-01-23T10:29:50.25
IV.MTRA.HNE. ML:1.8 0.0005335000000000001 0.2 AML other m 2021-01-23T10:29:50.31
IV.MTRA.EHE. ML:1.8 0.00051 0.2 AML other m 2021-01-23T10:29:50.31
IV.SMA1.EHN. ML:1.8 0.00031 0.24 AML other m 2021-01-23T10:29:53.14
IV.SMA1.EHE. ML:1.8 0.00029049999999999996 0.3 AML other m 2021-01-23T10:29:53.40
IV.NRCA.HHN. ML:1.9 0.000345 0.34 AML other m 2021-01-23T10:29:53.42
IV.NRCA.HNN. ML:1.9 0.0003635 0.68 AML other m 2021-01-23T10:29:53.93
IV.NRCA.HHE. ML:1.7 0.000249 0.74 AML other m 2021-01-23T10:29:54.42
IV.NRCA.HNE. ML:1.8 0.0002735 0.42 AML other m 2021-01-23T10:29:55.28
IV.CESI.HHN. ML:1.6 0.00011125000000000001 0.42 AML other m 2021-01-23T10:29:59.60
IV.CESI.HHE. ML:1.7 0.0001229 0.42 AML other m 2021-01-23T10:30:38.03
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