Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.2 on date 21-01-2021 and time 22:12:17 (UTC) in region 6 km N Acquasanta Terme (AP)

A magnitude ML 1.2 earthquake occured in region: 6 km N Acquasanta Terme (AP), on

  • 21-01-2021 22:12:17 (UTC)
  • 21-01-2021 23:12:17 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.8220, 13.4060 at 21 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.

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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
Acquasanta Terme AP 6 2916 2916
Montegallo AP 6 523 3439
Roccafluvione AP 7 2010 5449
Palmiano AP 10 196 5645
Venarotta AP 10 2066 7711
Arquata del Tronto AP 10 1178 8889
Montemonaco AP 11 604 9493
Valle Castellana TE 12 977 10470
Montefortino FM 14 1178 11648
Ascoli Piceno AP 15 49407 61055
Comunanza AP 15 3166 64221
Force AP 17 1354 65575
Rocca Santa Maria TE 18 537 66112
Amandola FM 18 3629 69741
Folignano AP 19 9241 78982
Montefalcone Appennino FM 19 424 79406
Accumoli RI 19 667 80073
Rotella AP 20 906 80979

Municipalities with at least 50000 inhabitants

An earthquake occurred to
30 Km NW of Teramo (54892 inhabitants)
52 Km N of L'Aquila (69753 inhabitants)
59 Km E of Foligno (57155 inhabitants)
68 Km E of Terni (111501 inhabitants)
70 Km W of Montesilvano (53738 inhabitants)
77 Km NW of Pescara (121014 inhabitants)
82 Km NW of Chieti (51815 inhabitants)
89 Km E of Perugia (166134 inhabitants)
89 Km S of Ancona (100861 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
Reviewed
Rev100 		ML 1.2 2021-01-21
22:12:17		 42.8223 13.4055 21 2021-01-21
22:20:40		 Sala Sismica INGV-Roma 86440561
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-21 22:12:17 ± 0.12
Latitude 42.8223 ± 0.0027
Longitude 13.4055 ± 0.0049
Depth (km) 21 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 86440561

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 459
Semi-minor axis of confidence ellipse (meter) 75
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 71
Circular confidence region, given by single value of horizontal uncertainty (meter) 460.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 131
Number of associated phases, regardless of their use for origin computation 22
Number of defining phases 18
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.17
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.31656
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 9
Magnitude information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.2
Num. used stations 11
Type of magnitude ML
Reference to an origin 86440561
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-01-21 22:20:40
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.PTRJ.HHZ. 2021-01-21T22:12:43.60 3.0 undecidable manual Pn 0.39 0
IV.BARO.EHZ. 2021-01-21T22:12:37.13 3.0 undecidable manual Pg 0.76 0
IV.FDMO.HHZ. 2021-01-21T22:12:30.18 0.1 undecidable manual S 313 35.1426 113 -0.14 96
IV.SAP2.EHZ. 2021-01-21T22:12:29.45 0.1 undecidable manual S 359 30.4473 117 0.26 93
IV.MURB.HHZ. 2021-01-21T22:12:29.69 3.0 undecidable manual Pg -0.27 0
IV.TERO.HHZ. 2021-01-21T22:12:28.55 0.1 undecidable manual S 144 27.4503 120 0.07 99
IV.GUMA.HHE. 2021-01-21T22:12:28.58 0.1 undecidable manual S 348 27.2505 120 0.13 96
IV.SMA1.EHZ. 2021-01-21T22:12:27.62 0.3 undecidable manual S 195 22.0668 127 0.34 71
IV.NRCA.HHZ. 2021-01-21T22:12:27.87 0.1 undecidable manual S 273 23.754 125 0.22 96
IV.MF5.EHE. 2021-01-21T22:12:26.80 0.1 undecidable manual S 13 18.87 132 0.17 97
IV.MMO1.EHZ. 2021-01-21T22:12:25.01 0.1 undecidable manual S 323 10.6782 150 -0.23 97
IV.GUMA.HHE. 2021-01-21T22:12:24.00 0.6 undecidable manual P 348 27.2505 120 0 49
IV.MTRA.EHZ. 2021-01-21T22:12:24.78 0.1 undecidable manual S 186 7.2927 158 -0.06 100
IV.FDMO.HHZ. 2021-01-21T22:12:24.80 1.0 negative manual P 313 35.1426 113 -0.28 23
IV.SAP2.EHZ. 2021-01-21T22:12:24.40 0.3 undecidable manual P 359 30.4473 117 -0.03 74
IV.NRCA.HHZ. 2021-01-21T22:12:23.46 0.1 negative manual P 273 23.754 125 -0.08 98
IV.TERO.HHZ. 2021-01-21T22:12:23.83 0.6 undecidable manual P 144 27.4503 120 -0.19 48
IV.SMA1.EHZ. 2021-01-21T22:12:23.37 0.1 negative manual P 195 22.0668 127 0.04 99
IV.GAVE.EHZ. 2021-01-21T22:12:22.19 3.0 undecidable manual P -3.73 0
IV.MF5.EHE. 2021-01-21T22:12:22.79 0.1 undecidable manual P 13 18.87 132 -0.16 98
IV.MTRA.EHZ. 2021-01-21T22:12:21.89 0.3 negative manual P 186 7.2927 158 -0.03 76
IV.MMO1.EHZ. 2021-01-21T22:12:21.87 0.6 undecidable manual P 323 10.6782 150 -0.28 48
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SMA1.EHN. ML:1.3 0.000097068105 0.2176 AML other m 2021-01-21T22:12:27.85
IV.SMA1.EHE. ML:1.2 0.0000837 0.14 AML other m 2021-01-21T22:12:28.00
IV.NRCA.HHN. ML:1.2 0.000082 1.58 AML other m 2021-01-21T22:12:28.03
IV.NRCA.HHE. ML:1.1 0.0000552 0.14 AML other m 2021-01-21T22:12:28.03
IV.MTRA.EHE. ML:1.3 0.00015688055 0.1536 AML other m 2021-01-21T22:12:25.02
IV.MTRA.EHN. ML:1.2 0.00012761275 0.1664 AML other m 2021-01-21T22:12:24.93
IV.MTRA.HNN. ML:1.4 0.00017416019999999999 0.2176 AML other m 2021-01-21T22:12:25.34
IV.TERO.HHE. ML:0.7 0.000018510974999999998 0.1408 AML other m 2021-01-21T22:12:28.69
IV.TERO.HNN. ML:1.5 0.000149333025 0.5888 AML other m 2021-01-21T22:12:30.62
IV.FDMO.HHE. ML:0.9 0.000031584815000000004 0.1152 AML other m 2021-01-21T22:12:30.98
IV.FDMO.HHN. ML:0.9 0.00003089084 0.2048 AML other m 2021-01-21T22:12:30.39
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