Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 25-01-2021 and time 17:08:34 (UTC) in region 5 km SW Roccafluvione (AP)

A magnitude ML 1.6 earthquake occured in region: 5 km SW Roccafluvione (AP), on

  • 25-01-2021 17:08:34 (UTC)
  • 25-01-2021 18:08:34 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.8350, 13.4260 at 23 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 13 977 9292
Arquata del Tronto AP 13 1178 10470
Ascoli Piceno AP 13 49407 59877
Comunanza AP 14 3166 63043
Montefortino FM 14 1178 64221
Force AP 15 1354 65575
Folignano AP 17 9241 74816
Amandola FM 17 3629 78445
Montefalcone Appennino FM 17 424 78869
Rotella AP 17 906 79775
Rocca Santa Maria TE 19 537 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)
54 Km N of L'Aquila (69753 inhabitants)
60 Km E of Foligno (57155 inhabitants)
69 Km NW of Montesilvano (53738 inhabitants)
71 Km E of Terni (111501 inhabitants)
77 Km NW of Pescara (121014 inhabitants)
81 Km NW of Chieti (51815 inhabitants)
87 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 1.6 2021-01-25
17:08:34		 42.8353 13.4257 23 2021-07-12
16:54:58		 Bollettino Sismico Italiano INGV 87036391
Reviewed
Rev100 		ML 1.5 2021-01-25
17:08:34		 42.8312 13.4128 22 2021-01-25
17:20:36		 Sala Sismica INGV-Roma 86569341
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-25 17:08:34 ± 0.16
Latitude 42.8353 ± 0.0045
Longitude 13.4257 ± 0.0098
Depth (km) 23 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 87036391

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 690
Semi-minor axis of confidence ellipse (meter) 495
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 241
Circular confidence region, given by single value of horizontal uncertainty (meter) 690.0
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 26
Number of defining phases 25
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) 0.41729
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 13
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 16
Type of magnitude ML
Reference to an origin 87036391
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-02-11 08:28:17

ML:1.5

Field Value
Value 1.5
Uncertainty 0.2
Num. used stations 16
Type of magnitude ML
Reference to an origin 86569341
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-01-25 17:20:36
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CESI.HHE. 2021-01-25T17:08:50.33 0.6 undecidable manual S 294 46.3203 109 0.54 43
IV.GAVE.EHZ. 2021-01-25T17:08:49.69 3.0 undecidable manual S -0.37 0
IV.LNSS.HHZ. 2021-01-25T17:08:48.81 0.6 undecidable manual S 231 40.626 112 0.44 44
IV.FDMO.HHZ. 2021-01-25T17:08:47.09 0.6 undecidable manual S 309 35.4423 116 0 49
IV.CSP1.EHZ. 2021-01-25T17:08:46.83 0.6 undecidable manual S 328 33.6441 117 0.16 47
IV.CAMP.HHE. 2021-01-25T17:08:46.82 0.6 undecidable manual S 182 33.2445 117 0.25 47
IV.TERO.HHZ. 2021-01-25T17:08:45.37 0.6 undecidable manual S 148 27.6501 123 0.08 49
IV.NRCA.HHZ. 2021-01-25T17:08:44.55 0.6 undecidable manual S 270 25.3524 126 -0.22 47
IV.SMA1.EHZ. 2021-01-25T17:08:44.43 0.3 undecidable manual S 198 23.8539 128 -0.03 74
IV.T1299.HNN. 2021-01-25T17:08:44.96 0.6 undecidable manual S 208 25.1526 126 0.22 48
IV.MF5.EHZ. 2021-01-25T17:08:43.58 0.6 undecidable manual S 9 17.1717 138 0.44 46
IV.LNSS.HHZ. 2021-01-25T17:08:42.50 0.3 undecidable manual P 231 40.626 112 0.02 72
IV.CESI.HHE. 2021-01-25T17:08:42.53 0.6 undecidable manual P 294 46.3203 109 -0.77 39
IV.MTRA.EHZ. 2021-01-25T17:08:41.65 0.6 undecidable manual S 195 9.0798 156 -0.3 48
IV.FDMO.HHZ. 2021-01-25T17:08:41.63 0.3 undecidable manual P 309 35.4423 116 -0.11 72
IV.MMO1.EHZ. 2021-01-25T17:08:41.90 0.3 undecidable manual S 312 10.6782 152 -0.25 72
IV.CAMP.HHE. 2021-01-25T17:08:41.04 0.6 undecidable manual P 182 33.2445 117 -0.4 45
IV.CSP1.EHZ. 2021-01-25T17:08:41.40 0.3 undecidable manual P 328 33.6441 117 -0.09 72
IV.SMA1.EHZ. 2021-01-25T17:08:40.23 0.3 undecidable manual P 198 23.8539 128 0.01 75
IV.T1299.HNN. 2021-01-25T17:08:40.49 0.3 undecidable manual P 208 25.1526 126 0.11 73
IV.NRCA.HHZ. 2021-01-25T17:08:40.30 0.6 undecidable manual P 270 25.3524 126 -0.1 49
IV.GUMA.HNN. 2021-01-25T17:08:40.78 0.6 undecidable manual P 344 26.2515 125 0.26 47
IV.TERO.HHZ. 2021-01-25T17:08:40.63 0.6 undecidable manual P 148 27.6501 123 -0.07 49
IV.MF5.EHZ. 2021-01-25T17:08:39.59 0.3 positive manual P 9 17.1717 138 0.13 74
IV.MTRA.EHZ. 2021-01-25T17:08:38.70 0.6 undecidable manual P 195 9.0798 156 -0.07 50
IV.MMO1.EHZ. 2021-01-25T17:08:38.79 0.1 positive manual P 312 10.6782 152 -0.1 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MTRA.EHE. ML:1.7 0.00030824030000000004 0.0768 AML other m 2021-01-25T17:08:41.77
IV.MTRA.EHN. ML:1.8 0.00038266655000000006 0.1664 AML other m 2021-01-25T17:08:41.74
IV.SMA1.EHN. ML:1.6 0.0002055 0.24 AML other m 2021-01-25T17:08:44.75
IV.SMA1.EHE. ML:1.6 0.000189 0.14 AML other m 2021-01-25T17:08:44.96
IV.NRCA.HHN. ML:1.7 0.0002335 0.14 AML other m 2021-01-25T17:08:44.92
IV.NRCA.HHE. ML:1.5 0.000137927415 0.064 AML other m 2021-01-25T17:08:44.92
IV.TERO.HHE. ML:1.0 0.00004007306 0.2048 AML other m 2021-01-25T17:08:46.39
IV.CSP1.EHN. ML:1.6 0.00015106943 1.8208 AML other m 2021-01-25T17:08:46.98
IV.FDMO.HHN. ML:1.2 0.000061933035 0.192 AML other m 2021-01-25T17:08:47.39
IV.FDMO.HHE. ML:1.3 0.000066172865 0.1152 AML other m 2021-01-25T17:08:47.90
IV.LNSS.HHN. ML:1.7 0.00014334517999999998 1.7824 AML other m 2021-01-25T17:08:49.03
IV.LNSS.HHE. ML:1.4 0.0000807139 0.128 AML other m 2021-01-25T17:08:49.68
IV.MTRA.HNE. ML:1.7 0.00029901974999999996 0.1792 AML other m 2021-01-25T17:08:42.48
IV.MTRA.HNN. ML:1.8 0.00038832665 0.1536 AML other m 2021-01-25T17:08:41.74
IV.NRCA.HNN. ML:1.7 0.00023612840000000003 0.1152 AML other m 2021-01-25T17:08:45.72
IV.NRCA.HNE. ML:1.6 0.0001530093 0.2432 AML other m 2021-01-25T17:08:45.12
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