Earthquake with magnitude of Md 2.5 on date 25-02-1985 and time 21:10:54 (Italy) in region 11 km SW Crognaleto (TE)

A magnitude Md 2.5 earthquake occured in region: 11 km SW Crognaleto (TE), on

  • 25-02-1985 20:10:54 (UTC)
  • 25-02-1985 21:10:54 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.46, 13.43 at 16 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
Crognaleto TE 11 1297 1297
Pizzoli AQ 11 4326 5623
Campotosto AQ 12 542 6165
Barete AQ 12 737 6902
L'Aquila AQ 12 69753 76655
Capitignano AQ 13 665 77320
Pietracamela TE 13 271 77591
Fano Adriano TE 14 296 77887
Montereale AQ 17 2581 80468
Cagnano Amiterno AQ 17 1369 81837
Scoppito AQ 17 3727 85564
Poggio Picenze AQ 18 1136 86700
Fossa AQ 19 721 87421
Cortino TE 19 656 88077
Isola del Gran Sasso d'Italia TE 20 4773 92850
Ocre AQ 20 1167 94017
Barisciano AQ 20 1828 95845

Municipalities with at least 50000 inhabitants

An earthquake occurred to
12 Km N of L'Aquila (69753 inhabitants)
32 Km SW of Teramo (54892 inhabitants)
59 Km W of Montesilvano (53738 inhabitants)
62 Km W of Chieti (51815 inhabitants)
64 Km W of Pescara (121014 inhabitants)
65 Km E of Terni (111501 inhabitants)
76 Km NE of Tivoli (56533 inhabitants)
77 Km NE of Guidonia Montecelio (88673 inhabitants)
81 Km SE of Foligno (57155 inhabitants)
100 Km NE of Roma (2864731 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 2.5 1985-02-25
20:10:54
42.46 13.43 16 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 2529
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-02-25 20:10:54 ± 0.407
Latitude 42.46 ± 0.02
Longitude 13.43 ± 0.03
Depth (km) 16 ± 4 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 2529

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) 3720.8
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 175
Number of associated phases, regardless of their use for origin computation 10
Number of defining phases 10
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.4
Epicentral distance of station closest to the epicenter (degree) 0.00089
Epicentral distance of station farthest from the epicenter (degree) 0.00745
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitude information

Md:2.5

Field Value
Value 2.5
Uncertainty
Num. used stations 2
Type of magnitude Md
Reference to an origin 2529
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:07:26
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.CM8.Z. 1985-02-25T20:11:22.20 10.0 undecidable manual SG 344 0.0068 1.04 0.2
--.MNS.Z. 1985-02-25T20:11:14.00 10.0 undecidable manual SG 262 0.0049 -0.58 0.4
--.AS1.Z. 1985-02-25T20:11:11.00 10.0 undecidable manual PG 316 0.0074 -0.16 1.4
--.SD1.Z. 1985-02-25T20:11:11.00 10.0 undecidable manual PG 159 0.0072 0.35 1
--.PO9.Z. 1985-02-25T20:11:09.80 10.0 undecidable manual SG 287 0.0033 0.91 0.4
--.CM8.Z. 1985-02-25T20:11:08.80 10.0 undecidable manual PG 344 0.0068 -1.16 0.3
--.MNS.Z. 1985-02-25T20:11:06.00 10.0 undecidable manual PG 262 0.0049 -0.15 1.7
--.PO9.Z. 1985-02-25T20:11:03.00 10.0 undecidable manual PG 287 0.0033 0.14 1.8
--.AQU.Z. 1985-02-25T20:11:01.00 10.0 undecidable manual SG 190 0.0009 -0.21 1
--.AQU.Z. 1985-02-25T20:10:58.50 10.0 positive manual PG 190 0.0009 0.06 1.8
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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