INGVCENTRO​NAZIONALE​TERREMOTI
Sala Sismica

Earthquake with magnitude of ML 0.8 on date 18-04-2017 and time 08:45:50 (Italy) in region E Villavallelonga (AQ)

A magnitude ML 0.8 earthquake occured in region: E Villavallelonga (AQ), on

  • 18-04-2017 06:45:50 (UTC)
  • 18-04-2017 08:45:50 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 41.87, 13.63 at 13 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Villavallelonga AQ 0 919 919
Collelongo AQ 4 1233 2152
Lecce nei Marsi AQ 9 1702 3854
Balsorano AQ 9 3569 7423
San Vincenzo Valle Roveto AQ 10 2347 9770
Ortucchio AQ 10 1860 11630
Gioia dei Marsi AQ 11 1989 13619
Bisegna AQ 12 223 13842
Trasacco AQ 13 6246 20088
Civita d'Antino AQ 13 979 21067
Pescosolido FR 13 1555 22622
Morino AQ 14 1448 24070
Pescasseroli AQ 15 2203 26273
Campoli Appennino FR 15 1725 27998
San Benedetto dei Marsi AQ 16 3909 31907
Sora FR 16 26144 58051
Ortona dei Marsi AQ 17 542 58593
Luco dei Marsi AQ 17 6079 64672
Civitella Roveto AQ 18 3268 67940
Pescina AQ 18 4133 72073
Broccostella FR 18 2741 74814
Villalago AQ 19 568 75382
Opi AQ 19 420 75802
Canistro AQ 20 995 76797

Municipalities with at least 50000 inhabitants

An earthquake occurred to
57 Km SE of L'Aquila (69753 inhabitants)
70 Km E of Tivoli (56533 inhabitants)
70 Km SW of Chieti (51815 inhabitants)
73 Km E of Velletri (53303 inhabitants)
75 Km NE of Latina (125985 inhabitants)
76 Km E of Guidonia Montecelio (88673 inhabitants)
82 Km SW of Pescara (121014 inhabitants)
84 Km SW of Montesilvano (53738 inhabitants)
87 Km E of Aprilia (73446 inhabitants)
88 Km S of Teramo (54892 inhabitants)
95 Km E of Roma (2864731 inhabitants)
95 Km NE of Anzio (54211 inhabitants)
96 Km E of Pomezia (62966 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
Rev 1000 Md 1.1
ML 0.8
2017-04-18
06:45:50
41.87 13.63 13 2018-01-10
09:56:12
Bollettino Sismico Italiano INGV 44139571
Rev 100 Md 1.1
ML 0.8
2017-04-18
06:45:50
41.87 13.63 13 2017-04-18
21:54:14
Sala Sismica INGV-Roma 44068501
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2017-04-18 06:45:50 ± 0.06
Latitude 41.87 ± 0.00
Longitude 13.63 ± 0.00
Depth (km) 13 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 44139571

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 393
Semi-minor axis of confidence ellipse (meter) 184
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 338
Circular confidence region, given by single value of horizontal uncertainty (meter) 390
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 103
Number of associated phases, regardless of their use for origin computation 17
Number of defining phases 14
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
Epicentral distance of station farthest from the epicenter (degree) 0.44876
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 7
Magnitudes information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.2
Num. used stations 3
Type of magnitude ML
Reference to an origin 44068501
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2017-04-18 21:54:14

ML:0.8

Field Value
Value 0.8
Uncertainty 0.2
Num. used stations 2
Type of magnitude ML
Reference to an origin 44139571
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2017-04-20 16:11:52

Md:1.1

Field Value
Value 1.1
Uncertainty 0.5
Num. used stations 2
Type of magnitude Md
Reference to an origin 44068501
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2017-04-18 21:54:14

Md:1.1

Field Value
Value 1.1
Uncertainty 0.5
Num. used stations 2
Type of magnitude Md
Reference to an origin 44139571
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2017-04-20 16:11:52
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
OX.VARN.HHZ. 2017-04-18T06:47:42.61 3.0 undecidable manual Sn -3.16 0
IV.ZONE.HHZ. 2017-04-18T06:47:14.36 3.0 undecidable manual Pg 17.450001 0
IV.MGR.HNZ. 2017-04-18T06:46:16.35 3.0 negative manual Pg 2.97 0
IV.LPEL.HHE. 2017-04-18T06:46:05.90 1.0 undecidable manual S 66 0.4488 93 -0.3 22
IV.CERA.HNN. 2017-04-18T06:46:04.91 0.6 undecidable manual S 133 0.3957 94 0.25 44
IV.INTR.HHZ. 2017-04-18T06:46:00.43 0.3 undecidable manual S 55 0.2491 98 0.1 71
IV.LPEL.HHE. 2017-04-18T06:45:59.80 1.0 undecidable manual P 66 0.4488 93 0.26 22
IV.PTQR.HHE. 2017-04-18T06:45:59.86 0.3 undecidable manual S 312 0.2293 99 0.11 71
IV.GUAR.HHN. 2017-04-18T06:45:59.93 1.0 undecidable manual S 253 0.2473 98 -0.35 22
IV.LRP.HHZ. 2017-04-18T06:45:59.46 0.3 undecidable manual S 188 0.223 100 -0.1 71
IV.CERA.HNN. 2017-04-18T06:45:58.29 0.6 undecidable manual P 133 0.3957 94 -0.36 43
IV.GUAR.HHN. 2017-04-18T06:45:56.21 0.6 undecidable manual P 253 0.2473 98 0.09 47
IV.INTR.HHZ. 2017-04-18T06:45:56.00 0.1 positive manual P 55 0.2491 98 -0.15 93
IV.PTQR.HHE. 2017-04-18T06:45:55.80 0.1 undecidable manual P 312 0.2293 99 -0.01 96
IV.LRP.HHZ. 2017-04-18T06:45:55.87 0.1 undecidable manual P 188 0.223 100 0.16 93
IV.VVLD.HHZ. 2017-04-18T06:45:54.80 0.3 undecidable manual S 287 0.0054 177 -0.03 75
IV.VVLD.HHZ. 2017-04-18T06:45:53.03 0.1 negative manual P 287 0.0054 177 0.05 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.INTR.HNE. ML:0 3.2856435E-8 1.7376 AML other m 2017-04-18T06:46:01.12
IV.INTR.HHE. ML:0.6 1.8454575E-5 0.3808 AML other m 2017-04-18T06:46:00.73
IV.INTR.HHN. ML:0.9 4.0368855E-5 0.3392 AML other m 2017-04-18T06:46:00.71
IV.INTR.HNN. ML:0 4.2375335E-8 0 AML other m 2017-04-18T06:46:00.75
IV.PAOL.HNE. ML:0 0.001309 0.92 AML other m 2017-04-18T06:46:15.93
IV.PAOL.HNN. ML:0 0.00172 0.88 AML other m 2017-04-18T06:46:15.93
IV.VVLD.HHN. ML:0.9 0.000111 1.66 AML other m 2017-04-18T06:45:55.88
IV.VVLD.HHE. ML:1 0.00012568965 0.2592 AML other m 2017-04-18T06:45:54.98
IV.VVLD.HHZ. Md:0.7 6 END duration s
IV.INTR.HHZ. Md:1.4 12 END duration s
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