Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.8 on date 23-01-2021 and time 15:13:12 (Italy) in region 1 km S Fagnano Alto (AQ)

A magnitude ML 1.8 earthquake occured in region: 1 km S Fagnano Alto (AQ), on

  • 23-01-2021 14:13:12 (UTC)
  • 23-01-2021 15:13:12 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.25, 13.58 at 8 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
Fagnano Alto AQ 1 418 418
Fontecchio AQ 3 369 787
Villa Sant'Angelo AQ 4 424 1211
Prata d'Ansidonia AQ 4 496 1707
San Demetrio ne' Vestini AQ 5 1854 3561
Sant'Eusanio Forconese AQ 6 394 3955
Rocca di Mezzo AQ 6 1526 5481
Tione degli Abruzzi AQ 7 310 5791
Rocca di Cambio AQ 7 533 6324
Caporciano AQ 8 230 6554
San Pio delle Camere AQ 8 661 7215
Poggio Picenze AQ 9 1136 8351
Fossa AQ 9 721 9072
Barisciano AQ 9 1828 10900
Ocre AQ 10 1167 12067
Carapelle Calvisio AQ 11 87 12154
Castelvecchio Calvisio AQ 12 153 12307
Santo Stefano di Sessanio AQ 12 111 12418
Navelli AQ 13 554 12972
Calascio AQ 13 137 13109
Secinaro AQ 13 359 13468
Ovindoli AQ 14 1227 14695
Acciano AQ 14 327 15022
Capestrano AQ 16 884 15906
Gagliano Aterno AQ 17 254 16160
Collepietro AQ 17 237 16397
Molina Aterno AQ 17 386 16783
San Benedetto in Perillis AQ 17 113 16896
Ofena AQ 18 506 17402
Castelvecchio Subequo AQ 18 982 18384
Castel del Monte AQ 18 413 18797
Celano AQ 18 11017 29814
Aielli AQ 19 1475 31289
L'Aquila AQ 19 69753 101042
Villa Santa Lucia degli Abruzzi AQ 19 123 101165
Castel di Ieri AQ 20 303 101468

Municipalities with at least 50000 inhabitants

An earthquake occurred to
19 Km SE of L'Aquila (69753 inhabitants)
47 Km S of Teramo (54892 inhabitants)
50 Km W of Chieti (51815 inhabitants)
56 Km SW of Montesilvano (53738 inhabitants)
58 Km W of Pescara (121014 inhabitants)
72 Km E of Tivoli (56533 inhabitants)
75 Km E of Guidonia Montecelio (88673 inhabitants)
84 Km E of Terni (111501 inhabitants)
91 Km NE of Velletri (53303 inhabitants)
98 Km E of Roma (2864731 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100 		ML 1.8 2021-01-23
14:13:12		 42.25 13.58 8 2021-01-23
14:39:08		 Sala Sismica INGV-Roma 86499531
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-23 14:13:12 ± 0.1
Latitude 42.25 ± 0.01
Longitude 13.58 ± 0.01
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 86499531

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 761
Semi-minor axis of confidence ellipse (meter) 325
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 61
Circular confidence region, given by single value of horizontal uncertainty (meter) 760
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 64
Number of associated phases, regardless of their use for origin computation 38
Number of defining phases 24
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.37
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.53869
Number of stations at which the event was observed 29
Number of stations from which data was used for origin computation 15
Magnitude information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.1
Num. used stations 4
Type of magnitude ML
Reference to an origin 86499531
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-01-23 14:39:08
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.EUCT.HNZ. 2021-01-23T14:15:02.68 3.0 undecidable manual Sn -1.2 0
IV.MSRU.HHZ. 2021-01-23T14:14:30.23 3.0 undecidable manual Pg 14.91 0
MN.TUE.HHZ. 2021-01-23T14:14:28.92 3.0 negative manual Pn 3.82 0
IV.SCIAC.HHZ. 2021-01-23T14:14:24.82 3.0 negative manual Pn 2.67 0
IV.CELB.HHZ. 2021-01-23T14:14:23.15 3.0 undecidable manual Sn 2.47 0
IV.FVI.HHZ. 2021-01-23T14:14:23.09 3.0 undecidable manual Pg 9.41 0
IV.JOPP.HHZ. 2021-01-23T14:14:14.84 3.0 undecidable manual Pn 2.36 0
IV.IST3.HNZ. 2021-01-23T14:14:14.10 3.0 positive manual Pg 6.69 0
OT.OT13.EHZ. 2021-01-23T14:14:07.26 3.0 undecidable manual Sn -1.42 0
IV.MTMR.EHZ. 2021-01-23T14:14:04.75 3.0 undecidable manual Sn 0.84 0
MN.TRI.HHZ. 2021-01-23T14:14:02.37 3.0 positive manual Pg 1.33 0
TV.SF04.EHZ. 2021-01-23T14:13:54.39 3.0 undecidable manual Sg -1.19 0
IV.FIR.HHZ. 2021-01-23T14:13:49.47 3.0 undecidable manual Pg 4.09 0
IV.BSSO.HHZ. 2021-01-23T14:13:29.97 3.0 undecidable manual P -0.91 0
IV.SMA1.EHE. 2021-01-23T14:13:28.69 0.6 undecidable manual S 335 0.4227 50 0.94 37
IV.INTR.HHZ. 2021-01-23T14:13:25.38 0.6 undecidable manual S 134 0.3381 50 0.15 48
IV.CAMP.HHE. 2021-01-23T14:13:24.99 0.6 undecidable manual S 337 0.3139 50 0.45 45
IV.PTQR.HHZ. 2021-01-23T14:13:23.41 0.6 undecidable manual S 210 0.2608 106 0.84 40
IV.LNSS.HHZ. 2021-01-23T14:13:23.22 0.3 undecidable manual P 312 0.5324 50 0.19 69
IV.VCEL.EHN. 2021-01-23T14:13:22.45 0.6 undecidable manual S 53 0.2437 107 0.51 45
IV.POFI.HHZ. 2021-01-23T14:13:22.85 0.3 undecidable manual P 169 0.5387 50 -0.28 68
IV.RM33.EHZ. 2021-01-23T14:13:20.39 0.3 undecidable manual P 314 0.375 50 0.06 73
IV.SMA1.EHE. 2021-01-23T14:13:20.83 0.3 undecidable manual P 335 0.4227 50 -0.32 69
IV.GIGS.HHE. 2021-01-23T14:13:20.05 0.6 undecidable manual S 359 0.2059 110 -0.51 46
IV.VVLD.HHN. 2021-01-23T14:13:20.14 0.3 undecidable manual P 175 0.3786 50 -0.26 70
MN.AQU.HHN. 2021-01-23T14:13:19.44 0.6 undecidable manual S 310 0.1664 114 0.29 48
IV.TERO.HHE. 2021-01-23T14:13:19.78 0.3 undecidable manual P 3 0.3759 50 -0.57 65
IV.FIAM.HNE. 2021-01-23T14:13:19.75 0.3 undecidable manual P 274 0.3417 50 -0.01 74
IV.INTR.HHZ. 2021-01-23T14:13:19.31 0.1 undecidable manual P 134 0.3381 50 -0.39 92
IV.T0110.HHZ. 2021-01-23T14:13:19.37 0.6 undecidable manual S 97 0.1475 117 0.87 40
IV.PTQR.HHZ. 2021-01-23T14:13:18.14 0.3 undecidable manual P 210 0.2608 106 -0.02 76
IV.CAMP.HHE. 2021-01-23T14:13:18.90 0.3 undecidable manual P 337 0.3139 50 -0.39 69
IV.VCEL.EHN. 2021-01-23T14:13:18.24 0.3 undecidable manual P 53 0.2437 107 0.44 69
MN.AQU.HHN. 2021-01-23T14:13:16.82 0.3 undecidable manual P 310 0.1664 114 0.63 66
IV.GIGS.HHE. 2021-01-23T14:13:16.83 0.1 undecidable manual P 359 0.2059 110 -0.17 99
IV.T0110.HHZ. 2021-01-23T14:13:15.97 0.1 undecidable manual P 97 0.1475 117 0.16 100
IV.FAGN.HHZ. 2021-01-23T14:13:13.51 0.1 undecidable manual P 13 0.0189 166 -0.32 99
IV.FAGN.HHZ. 2021-01-23T14:13:13.97 0.6 undecidable manual S 13 0.0189 166 -1.11 37
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FAGN.HHE. ML:0 0.03025 0.22 AML other m 2021-01-23T14:13:14.76
IV.FAGN.HHN. ML:0 0.03605 1.26 AML other m 2021-01-23T14:13:15.68
IV.T0110.HHE. ML:1.8 0.000635 1.58 AML other m 2021-01-23T14:13:21.82
IV.T0110.HHN. ML:2 0.0009335 0.9 AML other m 2021-01-23T14:13:21.56
IV.RM33.EHN. ML:1.7 0.000154 1.24 AML other m 2021-01-23T14:13:31.29
IV.RM33.EHE. ML:1.8 0.000201 0.84 AML other m 2021-01-23T14:13:31.85
IV.MTMR.EHN. ML:3.9 0.0024965 0.42 AML other m 2021-01-23T14:13:45.63
IV.MTMR.EHE. ML:3.8 0.002185 0.42 AML other m 2021-01-23T14:14:33.83
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download