ISTITUTO NAZIONALE DI GEOFISICA E VULCANOLOGIA

Earthquake with magnitude of Md 2.1 on date 10-08-1985 and time 13:28:33 (Italy) in region 4 km NW Fiastra (MC)

A magnitude Md 2.1 earthquake occured in region: 4 km NW Fiastra (MC), on

  • 10-08-1985 11:28:33 (UTC)
  • 10-08-1985 13:28:33 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.07, 13.14 at 5 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
Fiastra MC 4 559 559
Pievebovigliana MC 5 866 1425
Acquacanina MC 5 121 1546
Fiordimonte MC 5 202 1748
Pieve Torina MC 8 1458 3206
Muccia MC 8 915 4121
Camerino MC 10 6974 11095
Caldarola MC 11 1823 12918
Cessapalombo MC 11 512 13430
Bolognola MC 11 142 13572
Camporotondo di Fiastrone MC 13 563 14135
Serrapetrona MC 13 966 15101
Belforte del Chienti MC 13 1886 16987
Sarnano MC 14 3264 20251
Ussita MC 14 444 20695
Monte Cavallo MC 14 145 20840
San Ginesio MC 15 3498 24338
Serravalle di Chienti MC 15 1070 25408
Visso MC 16 1107 26515
Gualdo MC 16 815 27330
Castelraimondo MC 17 4587 31917
Pioraco MC 18 1134 33051
Sefro MC 18 422 33473
San Severino Marche MC 18 12726 46199
Castelsantangelo sul Nera MC 19 281 46480
Tolentino MC 20 20069 66549
Gagliole MC 20 620 67169

Municipalities with at least 50000 inhabitants

An earthquake occurred to
38 Km E of Foligno (57155 inhabitants)
61 Km E of Perugia (166134 inhabitants)
65 Km NW of Teramo (54892 inhabitants)
68 Km SW of Ancona (100861 inhabitants)
69 Km NE of Terni (111501 inhabitants)
83 Km N of L'Aquila (69753 inhabitants)
87 Km S of Fano (60888 inhabitants)
95 Km S of Pesaro (94582 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 2.1 1985-08-10
11:28:33
43.07 13.14 5 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 11439
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-08-10 11:28:33 ± 0.168
Latitude 43.07 ± 0.01
Longitude 13.14 ± 0.02
Depth (km) 5 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 11439

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) 1538
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 136
Number of associated phases, regardless of their use for origin computation 6
Number of defining phases 6
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.00105
Epicentral distance of station farthest from the epicenter (degree) 0.00923
Number of stations at which the event was observed 4
Number of stations from which data was used for origin computation 4
Magnitude information

Md:2.1

Field Value
Value 2.1
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 11439
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:14:52
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.CH1.Z. 1985-08-10T11:28:54.80 10.0 undecidable manual PG? 303 0.0092 0.39 0.1
--.ALP.Z. 1985-08-10T11:28:50.70 10.0 undecidable manual SG 132 0.0038 0.59 0.2
--.ALP.Z. 1985-08-10T11:28:42.70 10.0 undecidable manual PG 132 0.0038 -0.45 1
--.AS1.Z. 1985-08-10T11:28:41.50 10.0 undecidable manual PG 269 0.0032 -0.13 1.2
--.CM2.Z. 1985-08-10T11:28:38.70 10.0 undecidable manual SG 0 0.0011 -0.01 0.8
--.CM2.Z. 1985-08-10T11:28:36.50 10.0 negative manual PG 0 0.0011 -0.07 2.6
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
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