と考えられる details
Examples
it can reasonably be concluded that — presents a conclusion as warranted by the evidence rather than as anyone's opinion (that people in fact hold it is と考えられている)
この地層は約一万年前に形成されたと考えられる。
kono chisou wa yaku ichimannenmae ni keisei sareta to kangaerareru.
This stratum can reasonably be taken to have formed about ten thousand years ago. neutral
かつてこの病気は遺伝によるものと考えられていたが、現在では否定されている。
katsute kono byouki wa iden ni yoru mono to kangaerarete ita ga, genzai de wa hitei sarete iru.
This illness was once held to be hereditary, but that view has since been rejected. neutral
今回の不具合は、部品の経年劣化によるものと考えられます。
konkai no fuguai wa, buhin no keinenrekka ni yoru mono to kangaeraremasu.
This fault is best put down to age-related deterioration of the part. formal
Formation
plain clause + と考えられるattaches to plain clause
Notes
The bare 〜と考えられない reads as an unfinished sentence.
Related patterns
Similar
と思う pins the judgment on a named thinker who then answers for it (私は失敗だと思う); と考えられる deletes the thinker and presents the conclusion as what the evidence licenses — which is why conversation runs on と思う and papers and incident reports run on と考えられる, and why adding 私は back to と考えられる undoes the frame's whole purpose.
だろう is the speaker's own confidence gauge and works at any register in speech (明日は雨だろう); と考えられる is written-formal only and claims the conclusion follows from evidence stated somewhere in the text, so a weather remark takes だろう and a report's finding takes と考えられる — they are not interchangeable at any single register.
Lookalikes
考えられる is four ways ambiguous and the frame decides which — preceded by a と-clause and with no experiencer marked, it is the passive-potential "the conclusion is available to anyone", not "I am able to think it" — the potential reading needs its experiencer spelt out (私にはそうは考えられない "I can't see it that way"), and the academic frame deliberately has none.