Earthquake with magnitude of Md 3.4 on date 20-05-1985 and time 12:03:02 (Italy) in region 4 km W Ocre (AQ)

A magnitude Md 3.4 earthquake occured in region: 4 km W Ocre (AQ), on

  • 20-05-1985 10:03:02 (UTC)
  • 20-05-1985 12:03:02 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.29, 13.42 at 11 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
Ocre AQ 4 1167 1167
Fossa AQ 5 721 1888
Lucoli AQ 7 1011 2899
L'Aquila AQ 7 69753 72652
Rocca di Cambio AQ 8 533 73185
Sant'Eusanio Forconese AQ 8 394 73579
Villa Sant'Angelo AQ 10 424 74003
Tornimparte AQ 10 3187 77190
Poggio Picenze AQ 10 1136 78326
San Demetrio ne' Vestini AQ 11 1854 80180
Rocca di Mezzo AQ 12 1526 81706
Fagnano Alto AQ 13 418 82124
Barisciano AQ 14 1828 83952
Prata d'Ansidonia AQ 15 496 84448
Fontecchio AQ 16 369 84817
Scoppito AQ 17 3727 88544
Ovindoli AQ 19 1227 89771
Borgorose RI 19 4591 94362
San Pio delle Camere AQ 19 661 95023
Santo Stefano di Sessanio AQ 19 111 95134
Pizzoli AQ 20 4326 99460
Tione degli Abruzzi AQ 20 310 99770
Massa d'Albe AQ 20 1476 101246

Municipalities with at least 50000 inhabitants

An earthquake occurred to
7 Km S of L'Aquila (69753 inhabitants)
47 Km SW of Teramo (54892 inhabitants)
62 Km W of Chieti (51815 inhabitants)
63 Km NE of Tivoli (56533 inhabitants)
65 Km W of Montesilvano (53738 inhabitants)
66 Km E of Guidonia Montecelio (88673 inhabitants)
68 Km W of Pescara (121014 inhabitants)
71 Km E of Terni (111501 inhabitants)
86 Km NE of Velletri (53303 inhabitants)
89 Km NE of Roma (2864731 inhabitants)
95 Km SE of Foligno (57155 inhabitants)
100 Km NE of Aprilia (73446 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 3.4 1985-05-20
10:03:02
42.29 13.43 11 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 6749
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-05-20 10:03:02 ± 0.651
Latitude 42.29 ± 0.03
Longitude 13.43 ± 0.09
Depth (km) 11 ± 5 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 6749

Uncertainty

Field Value
Preferred uncertainty description horizontal uncertainty
Semi-major axis of confidence ellipse (meter)
Semi-minor axis of confidence ellipse (meter)
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi)
Circular confidence region, given by single value of horizontal uncertainty (meter) 7979.2
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 141
Number of associated phases, regardless of their use for origin computation 8
Number of defining phases 8
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.6
Epicentral distance of station closest to the epicenter (degree) 0.00057
Epicentral distance of station farthest from the epicenter (degree) 0.00834
Number of stations at which the event was observed 5
Number of stations from which data was used for origin computation 5
Magnitude information

Md:3.4

Field Value
Value 3.4
Uncertainty
Num. used stations 1
Type of magnitude Md
Reference to an origin 6749
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:11:03
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.CM2.Z. 1985-05-20T10:03:35.20 10.0 undecidable manual SG 347 0.0083 1.21 0.2
--.ALP.Z. 1985-05-20T10:03:21.41 10.0 undecidable manual SG 11 0.0045 1.05 0.4
--.CM2.Z. 1985-05-20T10:03:19.50 10.0 undecidable manual PG 347 0.0083 -1.1 1
--.SD1.Z. 1985-05-20T10:03:16.10 10.0 undecidable manual PG? 153 0.0057 0.69 0.4
--.MNS.Z. 1985-05-20T10:03:15.00 10.0 undecidable manual PG? 280 0.005 1.23 0.2
--.ALP.Z. 1985-05-20T10:03:12.62 10.0 positive manual PG 11 0.0045 -0.11 3.4
--.AQU.Z. 1985-05-20T10:03:07.00 10.0 undecidable manual SG 345 0.0006 0.18 0.7
--.AQU.Z. 1985-05-20T10:03:05.00 10.0 undecidable manual PG 345 0.0006 0.08 1.7
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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