In the (low seismicity) United Kingdom, for example, it has been calculated that the average recurrences are:
an earthquake of 3.7–4.6 every year, an earthquake of 4.7–5.5 every 10 years, and an earthquake of 5.6 or larger every 100 years. This is an example of the Gutenberg–Richter law. The number of seismic stations has increased from about 350 in 1931 to many thousands today. As a result, many more earthquakes are reported than in the past, but this is because of the vast improvement in instrumentation, rather than an increase in the number of earthquakes. The United States Geological Survey (USGS) estimates that, since 1900, there have been an average of 18 major earthquakes (magnitude 7.0–7.9) and one great earthquake (magnitude 8.0 or greater) per year, and that this average has been relatively stable. In recent years, the number of major earthquakes per year has decreased, though this is probably a statistical fluctuation rather than a systematic trend. More detailed statistics on the size and frequency of earthquakes is available from the United States Geological Survey. A recent increase in the number of major earthquakes has been noted, which could be explained by a cyclical pattern of periods of intense tectonic activity, interspersed with longer periods of low intensity.
Infantilism may refer to:

In psychologyParaphilic infantilism, a paraphilia involving the desire to wear diapers and/or fantasies of a return to infancy
Psychosexual infantilism, a concept in psychosexual development introduced by Sigmund Freud
In a more general sense and in colloquial expressions – childlike behavior in adults, particularly lack of judgement and poor ability to make conclusions based on logical reasoning as well as actions driven more by immediate impressions and impulses rather than by rationale. Depending on degree of expression can range from mental disorder, to behavioral disorder or simply psychological makeup and personality trait of otherwise healthy person.In medicineInfantilism (physiological disorder) obsolete use of the term for some developmental disorders and disabilities
Infantilism, also known as infantile speech, a speech disorder in which early speech stages persist beyond the age they are normally expected to fade
Hypothalamic infantilism-obesity, or sexual infantilism, synonyms for adiposogenital dystrophy

See also
Delayed puberty, delayed sexual development symptomatic of several medical syndromes
Diaper fetishism, a paraphilic attraction to wearing diapers which does not involve fantasies of childlike behavior
Paternalism, deliberate limiting of the autonomy of others